TY  - JOUR
AU  - Petrović, Milun D.
AU  - Rakonjac, Simeon
AU  - Bogdanović, Vladan
AU  - Bogosavljević-Bošković, Snežana
AU  - Djoković, Radojica
AU  - Djedović, Radica
AU  - Petrović, Miloš
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5177
AB  - The effects of fixed non-genetic factors (farm, season of birth, year of birth, total number of lactations) and a continuous non-genetic factor (age at first conception) on the expression and variability of longevity traits such as age at culling, length of productive life, days in milk and cow efficiency index were investigated in 2548 Simmental cows in three farming areas. Based on the model used for the analysis of the effects of non-genetic factors, including the environment and cow age at first conception, on the expression and variability of longevity traits, the overall means for age at culling, length of productive life, days in milk and cow efficiency index were 2445.21±17.49 days, 1562.55±17.71 days, 1094.17±12.28 days and 58.68±0.32%, respectively. The effect of farming area, year of birth and lactation group on longevity traits was very significant (P lt 0.01), whereas the effect of season of birth was significant (P lt 0.05). Age at first conception had a highly significant (P lt 0.01) effect on age at culling, length of productive life and cow efficiency index, and no significant effect on days in milk (P>0.05). Based on the model used, the coefficients of determination (R2 ) were very significant (P lt 0.01) for all longevity traits, and ranged from 0.898 for age at culling to 0.959 for days in milk.
AB  - Uticaj fiksnih (farma, sezona i godina rođenja, ukupan broj laktacija) i kontinuelnih (uzrast pri prvoj oplodnji) sistematskih faktora na ispoljenost i varijabilnost osobina dugovečnosti kao što su uzrast pri izlučenju, dužina produktivnog života, ukupan broj muznih dana i indeks iskorišćavanja krava proučavan je na uzorku od 2548 simentalskih krava raspoređenih na tri odgajivačka područja. Na osnovu primenjenog modela za analizu uticaja sistematskih faktora okoline i uzrasta krava pri prvoj oplodnji na ispoljenost i varijabilnost osobina dugovečnosti opšti prosek za uzrast pri izlučenju, dužinu produktivnog života, ukupan broj muznih dana i indeks iskorišćavanja krava iznosio je 2445,21±17,49 dana, 1562,55±17,71 dana, 1094,17±12,28 dana i 58,68±0,32%. Uticaj odgajivačkog područja, godine rođenja i grupe laktacija na osobine dugovečnosti bio je vrlo značajan (P lt 0.01), dok je uticaj sezone rođenja krava bio značajan (P lt 0.05). Uzrast pri prvoj oplodnji visoko značajno (P lt 0.01) je uticao na uzrast pri izlučenju, dužinu produktivnog života i indeks iskorišćavanja krava, dok na ukupan broj muznih dana nije imao značajan uticaj (P>0.05). Dobijeni koeficijenti determinacije (R2 ), na osnovu primenjenog modela, za sve osobine dugovečnosti bili su vrlo značajni (P lt 0.01) i kretali su se od 0,898 kod uzrasta pri izlučenju do 0,959 kod ukupnog broja muznih dana.
PB  - Institut za stočarstvo, Beograd
T2  - Biotechnology in Animal Husbandry
T1  - Effect of non-genetic factors on longevity traits in Simmental cows
T1  - Uticaj sistematskih faktora na osobine dugovečnosti kod krava simentalske rase
EP  - 241
IS  - 3
SP  - 229
VL  - 35
DO  - 10.2298/BAH1903229P
ER  - 

@article{
author = "Petrović, Milun D. and Rakonjac, Simeon and Bogdanović, Vladan and Bogosavljević-Bošković, Snežana and Djoković, Radojica and Djedović, Radica and Petrović, Miloš",
year = "2019",
abstract = "The effects of fixed non-genetic factors (farm, season of birth, year of birth, total number of lactations) and a continuous non-genetic factor (age at first conception) on the expression and variability of longevity traits such as age at culling, length of productive life, days in milk and cow efficiency index were investigated in 2548 Simmental cows in three farming areas. Based on the model used for the analysis of the effects of non-genetic factors, including the environment and cow age at first conception, on the expression and variability of longevity traits, the overall means for age at culling, length of productive life, days in milk and cow efficiency index were 2445.21±17.49 days, 1562.55±17.71 days, 1094.17±12.28 days and 58.68±0.32%, respectively. The effect of farming area, year of birth and lactation group on longevity traits was very significant (P lt 0.01), whereas the effect of season of birth was significant (P lt 0.05). Age at first conception had a highly significant (P lt 0.01) effect on age at culling, length of productive life and cow efficiency index, and no significant effect on days in milk (P>0.05). Based on the model used, the coefficients of determination (R2 ) were very significant (P lt 0.01) for all longevity traits, and ranged from 0.898 for age at culling to 0.959 for days in milk., Uticaj fiksnih (farma, sezona i godina rođenja, ukupan broj laktacija) i kontinuelnih (uzrast pri prvoj oplodnji) sistematskih faktora na ispoljenost i varijabilnost osobina dugovečnosti kao što su uzrast pri izlučenju, dužina produktivnog života, ukupan broj muznih dana i indeks iskorišćavanja krava proučavan je na uzorku od 2548 simentalskih krava raspoređenih na tri odgajivačka područja. Na osnovu primenjenog modela za analizu uticaja sistematskih faktora okoline i uzrasta krava pri prvoj oplodnji na ispoljenost i varijabilnost osobina dugovečnosti opšti prosek za uzrast pri izlučenju, dužinu produktivnog života, ukupan broj muznih dana i indeks iskorišćavanja krava iznosio je 2445,21±17,49 dana, 1562,55±17,71 dana, 1094,17±12,28 dana i 58,68±0,32%. Uticaj odgajivačkog područja, godine rođenja i grupe laktacija na osobine dugovečnosti bio je vrlo značajan (P lt 0.01), dok je uticaj sezone rođenja krava bio značajan (P lt 0.05). Uzrast pri prvoj oplodnji visoko značajno (P lt 0.01) je uticao na uzrast pri izlučenju, dužinu produktivnog života i indeks iskorišćavanja krava, dok na ukupan broj muznih dana nije imao značajan uticaj (P>0.05). Dobijeni koeficijenti determinacije (R2 ), na osnovu primenjenog modela, za sve osobine dugovečnosti bili su vrlo značajni (P lt 0.01) i kretali su se od 0,898 kod uzrasta pri izlučenju do 0,959 kod ukupnog broja muznih dana.",
publisher = "Institut za stočarstvo, Beograd",
journal = "Biotechnology in Animal Husbandry",
title = "Effect of non-genetic factors on longevity traits in Simmental cows, Uticaj sistematskih faktora na osobine dugovečnosti kod krava simentalske rase",
pages = "241-229",
number = "3",
volume = "35",
doi = "10.2298/BAH1903229P"
}

Petrović, M. D., Rakonjac, S., Bogdanović, V., Bogosavljević-Bošković, S., Djoković, R., Djedović, R.,& Petrović, M.. (2019). Effect of non-genetic factors on longevity traits in Simmental cows. in Biotechnology in Animal Husbandry
Institut za stočarstvo, Beograd., 35(3), 229-241.
https://doi.org/10.2298/BAH1903229P

Petrović MD, Rakonjac S, Bogdanović V, Bogosavljević-Bošković S, Djoković R, Djedović R, Petrović M. Effect of non-genetic factors on longevity traits in Simmental cows. in Biotechnology in Animal Husbandry. 2019;35(3):229-241.
doi:10.2298/BAH1903229P .

Petrović, Milun D., Rakonjac, Simeon, Bogdanović, Vladan, Bogosavljević-Bošković, Snežana, Djoković, Radojica, Djedović, Radica, Petrović, Miloš, "Effect of non-genetic factors on longevity traits in Simmental cows" in Biotechnology in Animal Husbandry, 35, no. 3 (2019):229-241,
https://doi.org/10.2298/BAH1903229P . .

TY  - JOUR
AU  - Petrović, Milun D.
AU  - Bogdanović, Vladan
AU  - Bogosavljević-Bošković, Snežana
AU  - Djoković, Radojica
AU  - Rakonjac, Simeon
AU  - Petrović, Miloš Ž.
AU  - Dosković, Vladimir
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4564
AB  - The effect of systematic and continuous environmental factors on 4% fat corrected milk (FCM) yield in 2805 Simmental cows over whole and standard lactations was evaluated using the general linear model. The test systematic or fixed factors included the effect of farm or breeding area, calving season, year of birth, season of birth, lactation group and interactions between year of birth and season of birth, breeding area and calving season, and breeding area and lactation group. The continuous factor analysed was the effect of age at first conception. The effect of breeding area, lactation group and calving season on 4%FCM yield over whole and standard lactations was found to be very highly significant (P lt 0.001). The interactions of fixed i.e. systematic factors involved in the model, including those between year and season of birth, breeding area and calving season, and farm and lactation group had a very highly significant effect (P lt 0.001) on 4% FCM yield over both whole and standard lactations. The age at first conception, as a continuous factor, showed a very highly significant effect (P lt 0.001) on 4% FCM yield over both whole and standard lactations. The model used to correct the 4%FCM yield over whole and standard lactations for the effect of systematic factors was very highly significant (P lt 0.001). The variance of the model accounted for 15.93% and 21.55% of the total variance in 4% FCM yield over whole and standard lactations, respectively. The resulting coefficient of determination (R2) in 4% FCM yield was 0.159 over whole lactations and 0.216 over standard lactations.
AB  - Analiza uticaja sistematskih i kontinuelnih faktora okoline na proizvodnju 4% mast-korigovanog mleka u celim i standardnim laktacijama kod 2805 krava simentalske rase izvršena je primenom opšteg linearnog modela. Od sistematskih odnosno fiksnih faktora analiziran je uticaj farme ili odgajivačkog područja, sezone telenja, godine i sezone rođenja, grupe laktacija i interakcije između godine i sezone rođenja, odgajivačkog područja i sezone telenja i odgajivačkog područja i grupe laktacija. Od kontinuelnih faktora posmatran je uticaj uzrasta pri prvoj oplodnji. Uticaj odgajivačkog područja, grupe laktacija i sezone telenja na proizvodnju 4%MKM u celim i standardnim laktacijama bila je vrlo visoko značajna (P lt 0.001). Interakcije fiksnih, odnosno sistematskih faktora, uključenih u model, kao što su interakcija između godine i sezone rođenja, zatim odgajivačkog područja i sezone telenja i farme i grupe laktacija, na proizvodnju 4%MKM kako u celim tako i u standardnim laktacijama imale su vrlo visoko značajan uticaj (P lt 0.001). Uzrast pri prvoj oplodnji, kao kontinuelni faktor, statistički vrlo visoko značajno (P lt 0.001) je uticao na proizvodnju 4% mast-korigovanog mleka i u celim i u standardnim laktacijama. Primenjeni model za korekciju proizvodnje 4%MKM u celim i standardnim laktacijama na dejstvo sistematskih faktora bio je vrlo visoko značajan (P lt 0.001). Udeo varijanse modela u ukupnoj varijansi kretao se od 15.93% kod proizvodnje 4%MKM u celim laktacijama do 21.55% kod proizvodnje 4%MKM u standardnim laktacijama. Dobijeni koeficijenti determinacije (R2) kod proizvodnje 4%MKM u celim i standardnim laktacijama iznosili su 0.159 i 0.216.
PB  - Univerzitet u Kragujevcu - Agronomski fakultet, Čačak
T2  - Acta agriculturae Serbica
T1  - The effect of systematic factors on 4% fat-corrected milk yield in Simmental cows
T1  - Uticaj sistematskih faktora na proizvodnju 4% mast korigovanog mleka kod krava simentalske rase
EP  - 35
IS  - 43
SP  - 23
VL  - 22
DO  - 10.5937/AASer1743023P
ER  - 

@article{
author = "Petrović, Milun D. and Bogdanović, Vladan and Bogosavljević-Bošković, Snežana and Djoković, Radojica and Rakonjac, Simeon and Petrović, Miloš Ž. and Dosković, Vladimir",
year = "2017",
abstract = "The effect of systematic and continuous environmental factors on 4% fat corrected milk (FCM) yield in 2805 Simmental cows over whole and standard lactations was evaluated using the general linear model. The test systematic or fixed factors included the effect of farm or breeding area, calving season, year of birth, season of birth, lactation group and interactions between year of birth and season of birth, breeding area and calving season, and breeding area and lactation group. The continuous factor analysed was the effect of age at first conception. The effect of breeding area, lactation group and calving season on 4%FCM yield over whole and standard lactations was found to be very highly significant (P lt 0.001). The interactions of fixed i.e. systematic factors involved in the model, including those between year and season of birth, breeding area and calving season, and farm and lactation group had a very highly significant effect (P lt 0.001) on 4% FCM yield over both whole and standard lactations. The age at first conception, as a continuous factor, showed a very highly significant effect (P lt 0.001) on 4% FCM yield over both whole and standard lactations. The model used to correct the 4%FCM yield over whole and standard lactations for the effect of systematic factors was very highly significant (P lt 0.001). The variance of the model accounted for 15.93% and 21.55% of the total variance in 4% FCM yield over whole and standard lactations, respectively. The resulting coefficient of determination (R2) in 4% FCM yield was 0.159 over whole lactations and 0.216 over standard lactations., Analiza uticaja sistematskih i kontinuelnih faktora okoline na proizvodnju 4% mast-korigovanog mleka u celim i standardnim laktacijama kod 2805 krava simentalske rase izvršena je primenom opšteg linearnog modela. Od sistematskih odnosno fiksnih faktora analiziran je uticaj farme ili odgajivačkog područja, sezone telenja, godine i sezone rođenja, grupe laktacija i interakcije između godine i sezone rođenja, odgajivačkog područja i sezone telenja i odgajivačkog područja i grupe laktacija. Od kontinuelnih faktora posmatran je uticaj uzrasta pri prvoj oplodnji. Uticaj odgajivačkog područja, grupe laktacija i sezone telenja na proizvodnju 4%MKM u celim i standardnim laktacijama bila je vrlo visoko značajna (P lt 0.001). Interakcije fiksnih, odnosno sistematskih faktora, uključenih u model, kao što su interakcija između godine i sezone rođenja, zatim odgajivačkog područja i sezone telenja i farme i grupe laktacija, na proizvodnju 4%MKM kako u celim tako i u standardnim laktacijama imale su vrlo visoko značajan uticaj (P lt 0.001). Uzrast pri prvoj oplodnji, kao kontinuelni faktor, statistički vrlo visoko značajno (P lt 0.001) je uticao na proizvodnju 4% mast-korigovanog mleka i u celim i u standardnim laktacijama. Primenjeni model za korekciju proizvodnje 4%MKM u celim i standardnim laktacijama na dejstvo sistematskih faktora bio je vrlo visoko značajan (P lt 0.001). Udeo varijanse modela u ukupnoj varijansi kretao se od 15.93% kod proizvodnje 4%MKM u celim laktacijama do 21.55% kod proizvodnje 4%MKM u standardnim laktacijama. Dobijeni koeficijenti determinacije (R2) kod proizvodnje 4%MKM u celim i standardnim laktacijama iznosili su 0.159 i 0.216.",
publisher = "Univerzitet u Kragujevcu - Agronomski fakultet, Čačak",
journal = "Acta agriculturae Serbica",
title = "The effect of systematic factors on 4% fat-corrected milk yield in Simmental cows, Uticaj sistematskih faktora na proizvodnju 4% mast korigovanog mleka kod krava simentalske rase",
pages = "35-23",
number = "43",
volume = "22",
doi = "10.5937/AASer1743023P"
}

Petrović, M. D., Bogdanović, V., Bogosavljević-Bošković, S., Djoković, R., Rakonjac, S., Petrović, M. Ž.,& Dosković, V.. (2017). The effect of systematic factors on 4% fat-corrected milk yield in Simmental cows. in Acta agriculturae Serbica
Univerzitet u Kragujevcu - Agronomski fakultet, Čačak., 22(43), 23-35.
https://doi.org/10.5937/AASer1743023P

Petrović MD, Bogdanović V, Bogosavljević-Bošković S, Djoković R, Rakonjac S, Petrović MŽ, Dosković V. The effect of systematic factors on 4% fat-corrected milk yield in Simmental cows. in Acta agriculturae Serbica. 2017;22(43):23-35.
doi:10.5937/AASer1743023P .

Petrović, Milun D., Bogdanović, Vladan, Bogosavljević-Bošković, Snežana, Djoković, Radojica, Rakonjac, Simeon, Petrović, Miloš Ž., Dosković, Vladimir, "The effect of systematic factors on 4% fat-corrected milk yield in Simmental cows" in Acta agriculturae Serbica, 22, no. 43 (2017):23-35,
https://doi.org/10.5937/AASer1743023P . .

TY  - JOUR
AU  - Petrović, Milun D.
AU  - Bogdanović, Vladan
AU  - Petrović, Milan M.
AU  - Bogosavljević-Bošković, Snežana
AU  - Doković, Radojica
AU  - Djedović, Radica
AU  - Rakonjac, Simeon
PY  - 2015
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3797
AB  - The effect of systematic and continuous environmental factors on milk performance traits over standard lactations in 2805 Simmental cows was evaluated using the general linear model. The systematic factors included the effect of farm or breeding area, calving season, year of birth, season of birth, lactation group and their interactions. The continuous factor analysed was the effect of age at first conception. The effect of farm, lactation group and calving season on standard lactation milk performance was found to be highly significant (P lt 0.01), excepting the effect of calving season on milk fat percent in standard lactations which showed statistical significance (P lt 0.05). The interactions between year and season of birth, farm and calving season, and farm and lactation group had a highly significant effect (P lt 0.01) on all performance traits studied. Age at first conception, as a continuous factor, had a highly significant effect (P lt 0.01) on milk yield and milk fat percent, and a non-significant effect on milk fat yield. The model used to correct the performance traits over standard lactations for the effect of systematic factors was highly significant (P lt 0.01). The variance of the model accounted for 20.06 and 37.31% of the total variance of milk fat yield and milk fat percent, respectively. The resulting coefficients of determination (R-2) ranged from 0.20 for milk fat yield to 0.37 for milk fat percent.
PB  - De Gruyter Open Ltd, Warsaw
T2  - Annals of Animal Science
T1  - Effect of non-genetic factors on standard lactation milk performance traits in simmental cows
EP  - 220
IS  - 1
SP  - 211
VL  - 15
DO  - 10.2478/aoas-2014-0073
ER  - 

@article{
author = "Petrović, Milun D. and Bogdanović, Vladan and Petrović, Milan M. and Bogosavljević-Bošković, Snežana and Doković, Radojica and Djedović, Radica and Rakonjac, Simeon",
year = "2015",
abstract = "The effect of systematic and continuous environmental factors on milk performance traits over standard lactations in 2805 Simmental cows was evaluated using the general linear model. The systematic factors included the effect of farm or breeding area, calving season, year of birth, season of birth, lactation group and their interactions. The continuous factor analysed was the effect of age at first conception. The effect of farm, lactation group and calving season on standard lactation milk performance was found to be highly significant (P lt 0.01), excepting the effect of calving season on milk fat percent in standard lactations which showed statistical significance (P lt 0.05). The interactions between year and season of birth, farm and calving season, and farm and lactation group had a highly significant effect (P lt 0.01) on all performance traits studied. Age at first conception, as a continuous factor, had a highly significant effect (P lt 0.01) on milk yield and milk fat percent, and a non-significant effect on milk fat yield. The model used to correct the performance traits over standard lactations for the effect of systematic factors was highly significant (P lt 0.01). The variance of the model accounted for 20.06 and 37.31% of the total variance of milk fat yield and milk fat percent, respectively. The resulting coefficients of determination (R-2) ranged from 0.20 for milk fat yield to 0.37 for milk fat percent.",
publisher = "De Gruyter Open Ltd, Warsaw",
journal = "Annals of Animal Science",
title = "Effect of non-genetic factors on standard lactation milk performance traits in simmental cows",
pages = "220-211",
number = "1",
volume = "15",
doi = "10.2478/aoas-2014-0073"
}

Petrović, M. D., Bogdanović, V., Petrović, M. M., Bogosavljević-Bošković, S., Doković, R., Djedović, R.,& Rakonjac, S.. (2015). Effect of non-genetic factors on standard lactation milk performance traits in simmental cows. in Annals of Animal Science
De Gruyter Open Ltd, Warsaw., 15(1), 211-220.
https://doi.org/10.2478/aoas-2014-0073

Petrović MD, Bogdanović V, Petrović MM, Bogosavljević-Bošković S, Doković R, Djedović R, Rakonjac S. Effect of non-genetic factors on standard lactation milk performance traits in simmental cows. in Annals of Animal Science. 2015;15(1):211-220.
doi:10.2478/aoas-2014-0073 .

Petrović, Milun D., Bogdanović, Vladan, Petrović, Milan M., Bogosavljević-Bošković, Snežana, Doković, Radojica, Djedović, Radica, Rakonjac, Simeon, "Effect of non-genetic factors on standard lactation milk performance traits in simmental cows" in Annals of Animal Science, 15, no. 1 (2015):211-220,
https://doi.org/10.2478/aoas-2014-0073 . .

TY  - JOUR
AU  - Petrović, Milun D.
AU  - Petrović, Milan M.
AU  - Skalicki, Z.
AU  - Bogdanović, Vladan
AU  - Djoković, Radojica
AU  - Rakonjac, Simeon
PY  - 2012
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2842
AB  - The effect of interaction between the farm and calving season, as well as the farm and group of lactations on milk performance traits (milk yield, yield of milk fat, 4% fat corrected milk and milk fat content) was analyzed on sample of 2805 Simmental cows with total 9718 standard lactations, housed on dairy farm 'Zlatiborski suvati' on Zlatibor (578 cows and 1968 lactations), dairy farm of the Agricultural holding Dobričevo in Ćuprija (964 cows and 3237 lactations) and dairy animals housed on family farms/households in the region of Kotraža (1263 cows and 4513 lactations). The significance of the effect of interaction between the farm and calving season, as well as interaction between the farm and group of lactations on all milk performance traits was very high (P lt 0.001), which justified their inclusion into models for assessment of the breeding value of dairy cows. The share of variance of interactions in total variance of milk performance traits in standard lactations was low (below and around 4%), which clearly indicated even more systematic factors and their interactions which influence the total variability of observed traits of milk performance of cows in standard lactations.
AB  - Uticaj interakcije farme i sezone telenja kao i farme i grupe laktacija na osobine mlečnosti (proizvodnja mleka, mlečne masti, 4% mast-korigovanog mleka i sadržaj mlečne masti) analizirano je kod 2805 krava simentalske rase sa ukupno 9718 standardnih laktacija koje su bile smeštene na farmi muznih krava 'Zlatiborski suvati' na Zlatiboru (578 krava i 1968 laktacija), farmi muznih krava na Poljoprivrednom dobru Dobričevo u Ćupriji (964 krava i 3237 laktacija) i području Kotraže na individualnim gazdinstvima (1263 krava i 4513 laktacija). Značajnost uticaja interakcija farme i sezone telenja, kao i interakcije farme i grupe laktacija na sve osobine mlečnosti standardnih laktacija bila je vrlo visoka (P lt 0.001), što opravdava njihovo uključivanje u modele za ocenu priplodne vrednosti muznih krava. Udeo varijanse interakcija u ukupnoj varijansi osobina mlečnosti standardnih laktacija bio je nizak (ispod i oko 4%), što jasno ukazuje na još veliki broj sistematskih faktora i njihovih interakcija koji utiču na ukupnu varijabilnost posmatranih osobina mlečnosti krava u standardnim laktacijama.
PB  - Institut za stočarstvo, Beograd
T2  - Biotechnology in Animal Husbandry
T1  - The effect of interaction of systematic factors on milk performance of Simmental cows in standard lactation
T1  - Efekat interakcije sistematskih faktora na mlečnost krava simentalske rase u standardnim laktacijama
EP  - 75
IS  - 1
SP  - 67
VL  - 28
DO  - 10.2298/BAH1201067P
ER  - 

@article{
author = "Petrović, Milun D. and Petrović, Milan M. and Skalicki, Z. and Bogdanović, Vladan and Djoković, Radojica and Rakonjac, Simeon",
year = "2012",
abstract = "The effect of interaction between the farm and calving season, as well as the farm and group of lactations on milk performance traits (milk yield, yield of milk fat, 4% fat corrected milk and milk fat content) was analyzed on sample of 2805 Simmental cows with total 9718 standard lactations, housed on dairy farm 'Zlatiborski suvati' on Zlatibor (578 cows and 1968 lactations), dairy farm of the Agricultural holding Dobričevo in Ćuprija (964 cows and 3237 lactations) and dairy animals housed on family farms/households in the region of Kotraža (1263 cows and 4513 lactations). The significance of the effect of interaction between the farm and calving season, as well as interaction between the farm and group of lactations on all milk performance traits was very high (P lt 0.001), which justified their inclusion into models for assessment of the breeding value of dairy cows. The share of variance of interactions in total variance of milk performance traits in standard lactations was low (below and around 4%), which clearly indicated even more systematic factors and their interactions which influence the total variability of observed traits of milk performance of cows in standard lactations., Uticaj interakcije farme i sezone telenja kao i farme i grupe laktacija na osobine mlečnosti (proizvodnja mleka, mlečne masti, 4% mast-korigovanog mleka i sadržaj mlečne masti) analizirano je kod 2805 krava simentalske rase sa ukupno 9718 standardnih laktacija koje su bile smeštene na farmi muznih krava 'Zlatiborski suvati' na Zlatiboru (578 krava i 1968 laktacija), farmi muznih krava na Poljoprivrednom dobru Dobričevo u Ćupriji (964 krava i 3237 laktacija) i području Kotraže na individualnim gazdinstvima (1263 krava i 4513 laktacija). Značajnost uticaja interakcija farme i sezone telenja, kao i interakcije farme i grupe laktacija na sve osobine mlečnosti standardnih laktacija bila je vrlo visoka (P lt 0.001), što opravdava njihovo uključivanje u modele za ocenu priplodne vrednosti muznih krava. Udeo varijanse interakcija u ukupnoj varijansi osobina mlečnosti standardnih laktacija bio je nizak (ispod i oko 4%), što jasno ukazuje na još veliki broj sistematskih faktora i njihovih interakcija koji utiču na ukupnu varijabilnost posmatranih osobina mlečnosti krava u standardnim laktacijama.",
publisher = "Institut za stočarstvo, Beograd",
journal = "Biotechnology in Animal Husbandry",
title = "The effect of interaction of systematic factors on milk performance of Simmental cows in standard lactation, Efekat interakcije sistematskih faktora na mlečnost krava simentalske rase u standardnim laktacijama",
pages = "75-67",
number = "1",
volume = "28",
doi = "10.2298/BAH1201067P"
}

Petrović, M. D., Petrović, M. M., Skalicki, Z., Bogdanović, V., Djoković, R.,& Rakonjac, S.. (2012). The effect of interaction of systematic factors on milk performance of Simmental cows in standard lactation. in Biotechnology in Animal Husbandry
Institut za stočarstvo, Beograd., 28(1), 67-75.
https://doi.org/10.2298/BAH1201067P

Petrović MD, Petrović MM, Skalicki Z, Bogdanović V, Djoković R, Rakonjac S. The effect of interaction of systematic factors on milk performance of Simmental cows in standard lactation. in Biotechnology in Animal Husbandry. 2012;28(1):67-75.
doi:10.2298/BAH1201067P .

Petrović, Milun D., Petrović, Milan M., Skalicki, Z., Bogdanović, Vladan, Djoković, Radojica, Rakonjac, Simeon, "The effect of interaction of systematic factors on milk performance of Simmental cows in standard lactation" in Biotechnology in Animal Husbandry, 28, no. 1 (2012):67-75,
https://doi.org/10.2298/BAH1201067P . .

TY  - JOUR
AU  - Mitrović, Sreten
AU  - Bogosavljević-Bošković, Snežana
AU  - Stanisić, Goran
AU  - Djermanović, Vladan
AU  - Dosković, Vladimir
AU  - Rakonjac, Simeon
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2694
AB  - This study involves the analysis of two breeds [Naked Neck (NN) and Svrljig chickens (Sv)], that is, strains [White Naked Neck (WNN) and Black Svrljig strain (BSv)] of chickens (birds) of both sexes reared under a semi-intensive system until day 84 of age. At 28 days of age, the test birds were kept in a litter housing system (about 8 birds/m(2)), following which they were provided a free-range paddock at 4 m(2)/bird. The following parameters were evaluated in the two strains and sexes of broilers (totalling 56 chickens) aged 84 days: body weight at slaughter, carcass weight, yields of breasts, thighs, drumsticks, wings, pelvis, back, head, neck, feet, abdominal fat and giblets. At the end of the fattening period, the test broilers of both sexes of the WNN strain had higher values (P lt 0.05) for yield of drumsticks and thighs (34.20 to 33.93%), a statistically lower yield (P lt 0.01) of the back and pelvis (26.34 to 26.97%), and a somewhat higher live body weight (1587.07 to 1562.28 g). The difference was not statistically significant (P>0.05); however, a similar yield was obtained for ready to grill carcass (61.73 to 61.99%) when compared with the black Svrljig strain. The differences obtained were not statistically significant (P>0.05). In addition to the genotype (breed, strain), broiler sex had a statistically significant effect (P lt 0.001; P lt 0.01; P lt 0.05) on body weight, carcass yield, yields of drumsticks and thighs, wings, head, feet, giblets and abdominal fat. Specifically, male broilers were found to have higher live body weight (1669.29 to 1480.07 g), carcass weight (1342.86 to 1198.28 g), yields of head (5.13 to 4.39%), drumsticks and thighs (34.26 to 33.96%), feet (5.39 to 5.06%) and giblets (6.46 to 6.31%), whereas the relative yields of carcass (conventional processing (CP): 80.96 to 80.44%; ready to roast (RR): 73.02 to 72.19%; ready to grill (RG): 62.30 to 61.45%), wings (14.06 to 13.76%) and abdominal fat (1.13 to 1.07%) were higher in female broilers.
PB  - Academic Journals, Victoria Island
T2  - African Journal of Biotechnology
T1  - Carcass characteristics of two strains of native broilers (White Naked Neck and Black Svrljig) fattened under a semi-intensive system
EP  - 15818
IS  - 70
SP  - 15813
VL  - 10
DO  - 10.5897/AJB11.1153
ER  - 

@article{
author = "Mitrović, Sreten and Bogosavljević-Bošković, Snežana and Stanisić, Goran and Djermanović, Vladan and Dosković, Vladimir and Rakonjac, Simeon",
year = "2011",
abstract = "This study involves the analysis of two breeds [Naked Neck (NN) and Svrljig chickens (Sv)], that is, strains [White Naked Neck (WNN) and Black Svrljig strain (BSv)] of chickens (birds) of both sexes reared under a semi-intensive system until day 84 of age. At 28 days of age, the test birds were kept in a litter housing system (about 8 birds/m(2)), following which they were provided a free-range paddock at 4 m(2)/bird. The following parameters were evaluated in the two strains and sexes of broilers (totalling 56 chickens) aged 84 days: body weight at slaughter, carcass weight, yields of breasts, thighs, drumsticks, wings, pelvis, back, head, neck, feet, abdominal fat and giblets. At the end of the fattening period, the test broilers of both sexes of the WNN strain had higher values (P lt 0.05) for yield of drumsticks and thighs (34.20 to 33.93%), a statistically lower yield (P lt 0.01) of the back and pelvis (26.34 to 26.97%), and a somewhat higher live body weight (1587.07 to 1562.28 g). The difference was not statistically significant (P>0.05); however, a similar yield was obtained for ready to grill carcass (61.73 to 61.99%) when compared with the black Svrljig strain. The differences obtained were not statistically significant (P>0.05). In addition to the genotype (breed, strain), broiler sex had a statistically significant effect (P lt 0.001; P lt 0.01; P lt 0.05) on body weight, carcass yield, yields of drumsticks and thighs, wings, head, feet, giblets and abdominal fat. Specifically, male broilers were found to have higher live body weight (1669.29 to 1480.07 g), carcass weight (1342.86 to 1198.28 g), yields of head (5.13 to 4.39%), drumsticks and thighs (34.26 to 33.96%), feet (5.39 to 5.06%) and giblets (6.46 to 6.31%), whereas the relative yields of carcass (conventional processing (CP): 80.96 to 80.44%; ready to roast (RR): 73.02 to 72.19%; ready to grill (RG): 62.30 to 61.45%), wings (14.06 to 13.76%) and abdominal fat (1.13 to 1.07%) were higher in female broilers.",
publisher = "Academic Journals, Victoria Island",
journal = "African Journal of Biotechnology",
title = "Carcass characteristics of two strains of native broilers (White Naked Neck and Black Svrljig) fattened under a semi-intensive system",
pages = "15818-15813",
number = "70",
volume = "10",
doi = "10.5897/AJB11.1153"
}

Mitrović, S., Bogosavljević-Bošković, S., Stanisić, G., Djermanović, V., Dosković, V.,& Rakonjac, S.. (2011). Carcass characteristics of two strains of native broilers (White Naked Neck and Black Svrljig) fattened under a semi-intensive system. in African Journal of Biotechnology
Academic Journals, Victoria Island., 10(70), 15813-15818.
https://doi.org/10.5897/AJB11.1153

Mitrović S, Bogosavljević-Bošković S, Stanisić G, Djermanović V, Dosković V, Rakonjac S. Carcass characteristics of two strains of native broilers (White Naked Neck and Black Svrljig) fattened under a semi-intensive system. in African Journal of Biotechnology. 2011;10(70):15813-15818.
doi:10.5897/AJB11.1153 .

Mitrović, Sreten, Bogosavljević-Bošković, Snežana, Stanisić, Goran, Djermanović, Vladan, Dosković, Vladimir, Rakonjac, Simeon, "Carcass characteristics of two strains of native broilers (White Naked Neck and Black Svrljig) fattened under a semi-intensive system" in African Journal of Biotechnology, 10, no. 70 (2011):15813-15818,
https://doi.org/10.5897/AJB11.1153 . .

TY  - JOUR
AU  - Petrović, Milun D.
AU  - Bogdanović, Vladan
AU  - Petrović, Milan M.
AU  - Rakonjac, Simeon
PY  - 2011
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/2557
AB  - The relationship between milk production traits over whole lactations was evaluated across three generations of Simmental cows, i.e. between daughters, dams and grand dams, by a phenotypic regression analysis with whole lactation traits in the daughter generation being used as the dependent variables (x1), and those in the dam and grand dam generations being used as the independent variables (x2 and x3). The results were obtained from a sample of 1170 daughters and as many dams and grand dams. The significance of the partial regression coefficients b2 and b3 was separately evaluated by a t-test. An analysis of variance was used to estimate the significance of the simultaneous effect of the production traits of dams and grand dams on the milk production achieved in the daughter generation. The calculated value of the partial regression coefficients for the whole lactation production traits across three generations (grand dams, dams and daughters) and their statistical significances determined by the t and F tests, as well as the regression equations used, suggested that the effect of the grand dam generation on the milk production traits in granddaughters was substantially lower than the effect of dams. The calculated partial regression coefficients (b2 and b3) were positive and statistically very significant (P lt 0.01), excepting the regression coefficients b3 for lactation length and b2 for milk fat content that were not statistically significant (P>0.05). A very significant change (P lt 0.01) was observed in all production traits in the daughter generation as simultaneously affected by the traits in the dam and grand dam generations.
AB  - Povezanost osobina mlečnosti u punim laktacijama analizirana je između tri generacije krava simentalske rase, odnosno između kćerki, majki i baba, fenotipskom regresionom analizom u uslovima kada su osobine punih laktacija u generaciji kćerki posmatrane kao zavisno (x1), a osobine punih laktacija u generaciji majki i baba kao nezavisno promenljive (x2 i x3). Rezultati su dobijeni na uzorku od po 1170 kćerki, majki i baba. Pojedinačno ispitivanje značajnosti delimičnih regresionih koeficijenata b2 i b3 izvršeno je t-testom, a analizom značajnosti istovremenog uticaja proizvodnih osobina majki i baba na ostvarenu proizvodnju kod kćerki izvršena je metodom analize varijanse. Na osnovu izračunate vrednosti delimičnih regresionih koeficijenata za proizvodne osobine celih laktacija kroz tri generacije (babe, majke i kćerke) i njihove statističke značajnosti određene t i F testom, kao i jednačina regresije konstatovano je da je uticaj generacije baba na proizvodnju unuka znatno manji u odnosu na uticaj kojeg imaju majke. Svi izračunati delimični koeficijenti regresije (b2 i b3) bili su pozitivni i statistički vrlo značajni (P lt 0.01), izuzimajući koeficijent regresije b3 kod trajanja laktacije i b2 kod sadržaja mlečne masti koji nisu bili statistički značajni (P>0.05). Značajnost promena svih posmatranih proizvodnih osobina u generaciji kćerki pri istovremenom uticaju tih osobina iz generacije majki i baba bila je vrlo visoka (P lt 0.01).
PB  - Institut za stočarstvo, Beograd
T2  - Biotechnology in Animal Husbandry
T1  - Regression analysis of milk production traits in Simmental cows
T1  - Korelaciona analiza povezanosti proizvodnih osobina kroz tri generacije krava simentalske rase
EP  - 1441
IS  - 4
SP  - 1433
VL  - 27
DO  - 10.2298/BAH1104433P
ER  - 

@article{
author = "Petrović, Milun D. and Bogdanović, Vladan and Petrović, Milan M. and Rakonjac, Simeon",
year = "2011",
abstract = "The relationship between milk production traits over whole lactations was evaluated across three generations of Simmental cows, i.e. between daughters, dams and grand dams, by a phenotypic regression analysis with whole lactation traits in the daughter generation being used as the dependent variables (x1), and those in the dam and grand dam generations being used as the independent variables (x2 and x3). The results were obtained from a sample of 1170 daughters and as many dams and grand dams. The significance of the partial regression coefficients b2 and b3 was separately evaluated by a t-test. An analysis of variance was used to estimate the significance of the simultaneous effect of the production traits of dams and grand dams on the milk production achieved in the daughter generation. The calculated value of the partial regression coefficients for the whole lactation production traits across three generations (grand dams, dams and daughters) and their statistical significances determined by the t and F tests, as well as the regression equations used, suggested that the effect of the grand dam generation on the milk production traits in granddaughters was substantially lower than the effect of dams. The calculated partial regression coefficients (b2 and b3) were positive and statistically very significant (P lt 0.01), excepting the regression coefficients b3 for lactation length and b2 for milk fat content that were not statistically significant (P>0.05). A very significant change (P lt 0.01) was observed in all production traits in the daughter generation as simultaneously affected by the traits in the dam and grand dam generations., Povezanost osobina mlečnosti u punim laktacijama analizirana je između tri generacije krava simentalske rase, odnosno između kćerki, majki i baba, fenotipskom regresionom analizom u uslovima kada su osobine punih laktacija u generaciji kćerki posmatrane kao zavisno (x1), a osobine punih laktacija u generaciji majki i baba kao nezavisno promenljive (x2 i x3). Rezultati su dobijeni na uzorku od po 1170 kćerki, majki i baba. Pojedinačno ispitivanje značajnosti delimičnih regresionih koeficijenata b2 i b3 izvršeno je t-testom, a analizom značajnosti istovremenog uticaja proizvodnih osobina majki i baba na ostvarenu proizvodnju kod kćerki izvršena je metodom analize varijanse. Na osnovu izračunate vrednosti delimičnih regresionih koeficijenata za proizvodne osobine celih laktacija kroz tri generacije (babe, majke i kćerke) i njihove statističke značajnosti određene t i F testom, kao i jednačina regresije konstatovano je da je uticaj generacije baba na proizvodnju unuka znatno manji u odnosu na uticaj kojeg imaju majke. Svi izračunati delimični koeficijenti regresije (b2 i b3) bili su pozitivni i statistički vrlo značajni (P lt 0.01), izuzimajući koeficijent regresije b3 kod trajanja laktacije i b2 kod sadržaja mlečne masti koji nisu bili statistički značajni (P>0.05). Značajnost promena svih posmatranih proizvodnih osobina u generaciji kćerki pri istovremenom uticaju tih osobina iz generacije majki i baba bila je vrlo visoka (P lt 0.01).",
publisher = "Institut za stočarstvo, Beograd",
journal = "Biotechnology in Animal Husbandry",
title = "Regression analysis of milk production traits in Simmental cows, Korelaciona analiza povezanosti proizvodnih osobina kroz tri generacije krava simentalske rase",
pages = "1441-1433",
number = "4",
volume = "27",
doi = "10.2298/BAH1104433P"
}

Petrović, M. D., Bogdanović, V., Petrović, M. M.,& Rakonjac, S.. (2011). Regression analysis of milk production traits in Simmental cows. in Biotechnology in Animal Husbandry
Institut za stočarstvo, Beograd., 27(4), 1433-1441.
https://doi.org/10.2298/BAH1104433P

Petrović MD, Bogdanović V, Petrović MM, Rakonjac S. Regression analysis of milk production traits in Simmental cows. in Biotechnology in Animal Husbandry. 2011;27(4):1433-1441.
doi:10.2298/BAH1104433P .

Petrović, Milun D., Bogdanović, Vladan, Petrović, Milan M., Rakonjac, Simeon, "Regression analysis of milk production traits in Simmental cows" in Biotechnology in Animal Husbandry, 27, no. 4 (2011):1433-1441,
https://doi.org/10.2298/BAH1104433P . .