TY  - JOUR
AU  - Djedović, Radica
AU  - Vukasinovic, Natascha
AU  - Stanojević, Dragan
AU  - Bogdanović, Vladan
AU  - Ismael, Hasan
AU  - Janković, Dobrila
AU  - Gligović, Nikolija
AU  - Brka, Muhamed
AU  - Štrbac, Ljuba
PY  - 2023
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6281
AB  - In this study, the authors focused on the evaluation of the genetic parameters of longevity, milk yield traits, and type traits in dairy cattle populations in the Republic of Serbia. The total dataset used consisted of production records and pedigree data for 32,512 Holstein cows that calved from 1981 to 2015. The animal model was applied to determine the variance and covariance components and genetic parameters of the analyzed traits by applying the restricted maximum likelihood (REML) approach and using the programs VCE6 and PEST. The heritability of longevity traits was estimated using the Survival Kit V6.0 software package. Variance and covariance were estimated for five production traits: milk yield (MY), fat yield (FY), protein yield (PY), milk fat content (MC), and protein content (PC), and three longevity traits: length of productive life (LPL), lifetime milk yield (LMY), and the number of lactations achieved (NL) as well as for 18 standard type traits. Heritabilities for the milk, fat, and protein yield traits were 0.20 (MY), 0.15 (FY), and 0.19 (PY), respectively. The estimated coefficients of heritability for the longevity traits were higher when using the Weibull proportional hazards model compared to the traditional linear methods and ranged from 0.08 for NL to 0.10 for LPL. Heritability values for the type traits varied from a low of 0.10 (RLSsv—rear legs set–side view) to medium values of 0.32 (ST-stature). Genetic correlations were found between MY and the following longevity traits: LPL, LMY, and NL with values of −0.18, −0.11, and −0.09, respectively. Genetic correlations were found between MY and a number of linear type traits and varied from 0.02 (between MY and RUH-rear udder height) to 0.28 (between MY and FUA-fore udder attachment). Genetic correlations between the 18 investigated type traits ranged from −0.33 between TL (top line) and RTP (rear teats position) to 0.71 between AN (angularity) and RUH (rear udder height). Genetic correlations between most linear type traits and longevity traits (LPL, LMY, and NL) were generally negative and very low. The highest positive genetic correlation was found between UD and LPL (rxy = 0.38). © 2023 by the authors.
T2  - Animals
T2  - Animals
T1  - Genetic Parameters for Functional Longevity, Type Traits, and Production in the Serbian Holstein
IS  - 3
VL  - 13
DO  - 10.3390/ani13030534
ER  - 

@article{
author = "Djedović, Radica and Vukasinovic, Natascha and Stanojević, Dragan and Bogdanović, Vladan and Ismael, Hasan and Janković, Dobrila and Gligović, Nikolija and Brka, Muhamed and Štrbac, Ljuba",
year = "2023",
abstract = "In this study, the authors focused on the evaluation of the genetic parameters of longevity, milk yield traits, and type traits in dairy cattle populations in the Republic of Serbia. The total dataset used consisted of production records and pedigree data for 32,512 Holstein cows that calved from 1981 to 2015. The animal model was applied to determine the variance and covariance components and genetic parameters of the analyzed traits by applying the restricted maximum likelihood (REML) approach and using the programs VCE6 and PEST. The heritability of longevity traits was estimated using the Survival Kit V6.0 software package. Variance and covariance were estimated for five production traits: milk yield (MY), fat yield (FY), protein yield (PY), milk fat content (MC), and protein content (PC), and three longevity traits: length of productive life (LPL), lifetime milk yield (LMY), and the number of lactations achieved (NL) as well as for 18 standard type traits. Heritabilities for the milk, fat, and protein yield traits were 0.20 (MY), 0.15 (FY), and 0.19 (PY), respectively. The estimated coefficients of heritability for the longevity traits were higher when using the Weibull proportional hazards model compared to the traditional linear methods and ranged from 0.08 for NL to 0.10 for LPL. Heritability values for the type traits varied from a low of 0.10 (RLSsv—rear legs set–side view) to medium values of 0.32 (ST-stature). Genetic correlations were found between MY and the following longevity traits: LPL, LMY, and NL with values of −0.18, −0.11, and −0.09, respectively. Genetic correlations were found between MY and a number of linear type traits and varied from 0.02 (between MY and RUH-rear udder height) to 0.28 (between MY and FUA-fore udder attachment). Genetic correlations between the 18 investigated type traits ranged from −0.33 between TL (top line) and RTP (rear teats position) to 0.71 between AN (angularity) and RUH (rear udder height). Genetic correlations between most linear type traits and longevity traits (LPL, LMY, and NL) were generally negative and very low. The highest positive genetic correlation was found between UD and LPL (rxy = 0.38). © 2023 by the authors.",
journal = "Animals, Animals",
title = "Genetic Parameters for Functional Longevity, Type Traits, and Production in the Serbian Holstein",
number = "3",
volume = "13",
doi = "10.3390/ani13030534"
}

Djedović, R., Vukasinovic, N., Stanojević, D., Bogdanović, V., Ismael, H., Janković, D., Gligović, N., Brka, M.,& Štrbac, L.. (2023). Genetic Parameters for Functional Longevity, Type Traits, and Production in the Serbian Holstein. in Animals, 13(3).
https://doi.org/10.3390/ani13030534

Djedović R, Vukasinovic N, Stanojević D, Bogdanović V, Ismael H, Janković D, Gligović N, Brka M, Štrbac L. Genetic Parameters for Functional Longevity, Type Traits, and Production in the Serbian Holstein. in Animals. 2023;13(3).
doi:10.3390/ani13030534 .

Djedović, Radica, Vukasinovic, Natascha, Stanojević, Dragan, Bogdanović, Vladan, Ismael, Hasan, Janković, Dobrila, Gligović, Nikolija, Brka, Muhamed, Štrbac, Ljuba, "Genetic Parameters for Functional Longevity, Type Traits, and Production in the Serbian Holstein" in Animals, 13, no. 3 (2023),
https://doi.org/10.3390/ani13030534 . .

TY  - JOUR
AU  - Kučević, Denis
AU  - Trivunović, Snežana
AU  - Šoronja, Žika
AU  - Janković, Dobrila
AU  - Stanojević, Dragan
AU  - Djedović, Radica
AU  - Papović, Tamara
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5483
AB  - The objective of this research was to determine the association between age at first calving (AFC) and milk production in the first lactation of longevity traits for Holstein cows. The research was conducted on 2307 cows raised on 4 farms in AP Vojvodina. The cows were culled in the period from 2017 to 2018. The cows belonged to the group of Holstein Friesian breed of cattle. Cow longevity was observed using three parameters: number of lactations (NL), lifetime milk yield (LMY) and length of productive life (LPL). The research involved the influence of the farm on which the animals realized their production, the season of first calving. A mean value obtained for the length of productive life in the analysed population was 1207 days (3.30 years on average). During this period the animals on average realized 2.45 lactations and produced on average 18798 kg milk. All studied traits showed a high level of variability. From these data, the study sought to determine the influence of factors on the traits of longevity, our research present that studied factors showed high statistical significance on these traits except in the case of the season of first calving where a statistical significance effect wasn't observed. The season of first calving did not affect the animal traits for longevity and, generally, didn't affect the calving interval. Regarding the obtained correlation data between age at first calving and length of productive life, it can be concluded that belated AFC leads to reduced reproductive performance.
AB  - Sprovedeno istraživanje imalo je za cilj da utvrdi povezanost između uzrasta pri prvom teljenju i proizvodnje mleka u prvoj laktaciji sa osobinama dugovečnosti za krave holštajn-frizijske rase. Istraživanjem je obuhvaćeno 2307 krava, sa 4 različite farme sa teritorije AP Vojvodine. Krave su izlučene u periodu od 2017 do 2018 godine. Dugovečnost krava je posmatrana kroz tri pokazatelja: broj ostvarenih laktacija (NL), životna količina proizvedenog mleka (LMY) i dužina produktivnog života (LPL). Prosečno trajanje produktivnog života za sva grla uključena u analizu iznosilo je 1207 dana (3.30 godine u proseku). Grla obuhvaćena analizom u toku svog produktivnog života su prosečno proizvela 18798 kg mleka. Broj laktacija koje je svako grlo prosečno ostvarilo u toku trajanja svog produktivnog života iznosio je 2.45, pri čemu su svi ispitani parametri pokazali visok nivo varijabilnosti. U istraživanju su ispitani fiksni uticaji farme na kojoj je grlo proizvodilo, uzrasta pri prvom teljenju, sistema proizvodnje i sezone pri prvom teljenju na osobine dugovečnosti i međutelidbeni interval, korišćenjem linearnog modela. Na osnovu rezultata dobijenih istraživanjem, fiksni faktori su pokazali visoku statističku značajnost za ispitivane osobine, osim u slučaju sezone pri prvom teljenju, gde nije ispoljena statistička značajnost za osobine obuhvaćene istraživanjem. Na osnovu rezultata, utvrđena je povezanost između uzrasta pri prvom teljenju i dužine produktivnog života, pri čemu se može zaključiti da su kraći produktivni život imale životinje koje su se kasnije telile.
PB  - Institut za stočarstvo, Beograd
T2  - Biotechnology in Animal Husbandry
T1  - Association between age at first calving and milk production in first lactation on longevity traits in Holstein cows
T1  - Povezanost između uzrasta pri prvom teljenju i proizvodnje u prvoj laktaciji sa osobinama dugovečnosti kod mlečnih krava
EP  - 35
IS  - 1
SP  - 27
VL  - 36
DO  - 10.2298/BAH2001027K
ER  - 

@article{
author = "Kučević, Denis and Trivunović, Snežana and Šoronja, Žika and Janković, Dobrila and Stanojević, Dragan and Djedović, Radica and Papović, Tamara",
year = "2020",
abstract = "The objective of this research was to determine the association between age at first calving (AFC) and milk production in the first lactation of longevity traits for Holstein cows. The research was conducted on 2307 cows raised on 4 farms in AP Vojvodina. The cows were culled in the period from 2017 to 2018. The cows belonged to the group of Holstein Friesian breed of cattle. Cow longevity was observed using three parameters: number of lactations (NL), lifetime milk yield (LMY) and length of productive life (LPL). The research involved the influence of the farm on which the animals realized their production, the season of first calving. A mean value obtained for the length of productive life in the analysed population was 1207 days (3.30 years on average). During this period the animals on average realized 2.45 lactations and produced on average 18798 kg milk. All studied traits showed a high level of variability. From these data, the study sought to determine the influence of factors on the traits of longevity, our research present that studied factors showed high statistical significance on these traits except in the case of the season of first calving where a statistical significance effect wasn't observed. The season of first calving did not affect the animal traits for longevity and, generally, didn't affect the calving interval. Regarding the obtained correlation data between age at first calving and length of productive life, it can be concluded that belated AFC leads to reduced reproductive performance., Sprovedeno istraživanje imalo je za cilj da utvrdi povezanost između uzrasta pri prvom teljenju i proizvodnje mleka u prvoj laktaciji sa osobinama dugovečnosti za krave holštajn-frizijske rase. Istraživanjem je obuhvaćeno 2307 krava, sa 4 različite farme sa teritorije AP Vojvodine. Krave su izlučene u periodu od 2017 do 2018 godine. Dugovečnost krava je posmatrana kroz tri pokazatelja: broj ostvarenih laktacija (NL), životna količina proizvedenog mleka (LMY) i dužina produktivnog života (LPL). Prosečno trajanje produktivnog života za sva grla uključena u analizu iznosilo je 1207 dana (3.30 godine u proseku). Grla obuhvaćena analizom u toku svog produktivnog života su prosečno proizvela 18798 kg mleka. Broj laktacija koje je svako grlo prosečno ostvarilo u toku trajanja svog produktivnog života iznosio je 2.45, pri čemu su svi ispitani parametri pokazali visok nivo varijabilnosti. U istraživanju su ispitani fiksni uticaji farme na kojoj je grlo proizvodilo, uzrasta pri prvom teljenju, sistema proizvodnje i sezone pri prvom teljenju na osobine dugovečnosti i međutelidbeni interval, korišćenjem linearnog modela. Na osnovu rezultata dobijenih istraživanjem, fiksni faktori su pokazali visoku statističku značajnost za ispitivane osobine, osim u slučaju sezone pri prvom teljenju, gde nije ispoljena statistička značajnost za osobine obuhvaćene istraživanjem. Na osnovu rezultata, utvrđena je povezanost između uzrasta pri prvom teljenju i dužine produktivnog života, pri čemu se može zaključiti da su kraći produktivni život imale životinje koje su se kasnije telile.",
publisher = "Institut za stočarstvo, Beograd",
journal = "Biotechnology in Animal Husbandry",
title = "Association between age at first calving and milk production in first lactation on longevity traits in Holstein cows, Povezanost između uzrasta pri prvom teljenju i proizvodnje u prvoj laktaciji sa osobinama dugovečnosti kod mlečnih krava",
pages = "35-27",
number = "1",
volume = "36",
doi = "10.2298/BAH2001027K"
}

Kučević, D., Trivunović, S., Šoronja, Ž., Janković, D., Stanojević, D., Djedović, R.,& Papović, T.. (2020). Association between age at first calving and milk production in first lactation on longevity traits in Holstein cows. in Biotechnology in Animal Husbandry
Institut za stočarstvo, Beograd., 36(1), 27-35.
https://doi.org/10.2298/BAH2001027K

Kučević D, Trivunović S, Šoronja Ž, Janković D, Stanojević D, Djedović R, Papović T. Association between age at first calving and milk production in first lactation on longevity traits in Holstein cows. in Biotechnology in Animal Husbandry. 2020;36(1):27-35.
doi:10.2298/BAH2001027K .

Kučević, Denis, Trivunović, Snežana, Šoronja, Žika, Janković, Dobrila, Stanojević, Dragan, Djedović, Radica, Papović, Tamara, "Association between age at first calving and milk production in first lactation on longevity traits in Holstein cows" in Biotechnology in Animal Husbandry, 36, no. 1 (2020):27-35,
https://doi.org/10.2298/BAH2001027K . .

TY  - JOUR
AU  - Stanojević, Dragan
AU  - Djedović, Radica
AU  - Bogdanović, Vladan
AU  - Raguz, Nikola
AU  - Popovac, Mladen
AU  - Janković, Dobrila
AU  - Strbac, Ljuba
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4064
AB  - Assessment of the heritability coefficients of longevity traits in the population of Black and White cows was performed on a data set that included production results of 16,539 of black and white culled cows, which reached a total of 50,382 lactations in the period from 1985 to 2012. The cows were grown on 7 farms of the Agricultural Corporation Belgrade and are progeny of 277 bulls. The analysis covered the following traits: length of productive life (LPL), lifetime milk yield (LMY) and number of lactations (NL). Variance components of longevity traits were estimated using a BLUP linear mixed model with animal as a random effect. Cows included in the analysis calved for the first time in the average age of 26.86 months, while the average length of productive life amounted to 1,299.9 days and during that time the animals achieved an average of 3.04 lactations and life time production of 21,016 kg of milk. The values of the heritability coefficients of longevity traits ranged from 0.066; 0.061 and 0.074 regarding the length of productive life, lifetime milk yield and number of lactations respectively.
PB  - Croatian Dairy Union, Zagreb
T2  - Mljekarstvo
T1  - Evaluation of the heritability coefficients of longevity in the population of Black and White cows in Serbia
EP  - 329
IS  - 4
SP  - 322
VL  - 66
DO  - 10.15567/mljekarstvo.2016.0408
ER  - 

@article{
author = "Stanojević, Dragan and Djedović, Radica and Bogdanović, Vladan and Raguz, Nikola and Popovac, Mladen and Janković, Dobrila and Strbac, Ljuba",
year = "2016",
abstract = "Assessment of the heritability coefficients of longevity traits in the population of Black and White cows was performed on a data set that included production results of 16,539 of black and white culled cows, which reached a total of 50,382 lactations in the period from 1985 to 2012. The cows were grown on 7 farms of the Agricultural Corporation Belgrade and are progeny of 277 bulls. The analysis covered the following traits: length of productive life (LPL), lifetime milk yield (LMY) and number of lactations (NL). Variance components of longevity traits were estimated using a BLUP linear mixed model with animal as a random effect. Cows included in the analysis calved for the first time in the average age of 26.86 months, while the average length of productive life amounted to 1,299.9 days and during that time the animals achieved an average of 3.04 lactations and life time production of 21,016 kg of milk. The values of the heritability coefficients of longevity traits ranged from 0.066; 0.061 and 0.074 regarding the length of productive life, lifetime milk yield and number of lactations respectively.",
publisher = "Croatian Dairy Union, Zagreb",
journal = "Mljekarstvo",
title = "Evaluation of the heritability coefficients of longevity in the population of Black and White cows in Serbia",
pages = "329-322",
number = "4",
volume = "66",
doi = "10.15567/mljekarstvo.2016.0408"
}

Stanojević, D., Djedović, R., Bogdanović, V., Raguz, N., Popovac, M., Janković, D.,& Strbac, L.. (2016). Evaluation of the heritability coefficients of longevity in the population of Black and White cows in Serbia. in Mljekarstvo
Croatian Dairy Union, Zagreb., 66(4), 322-329.
https://doi.org/10.15567/mljekarstvo.2016.0408

Stanojević D, Djedović R, Bogdanović V, Raguz N, Popovac M, Janković D, Strbac L. Evaluation of the heritability coefficients of longevity in the population of Black and White cows in Serbia. in Mljekarstvo. 2016;66(4):322-329.
doi:10.15567/mljekarstvo.2016.0408 .

Stanojević, Dragan, Djedović, Radica, Bogdanović, Vladan, Raguz, Nikola, Popovac, Mladen, Janković, Dobrila, Strbac, Ljuba, "Evaluation of the heritability coefficients of longevity in the population of Black and White cows in Serbia" in Mljekarstvo, 66, no. 4 (2016):322-329,
https://doi.org/10.15567/mljekarstvo.2016.0408 . .

TY  - JOUR
AU  - Kučević, Denis
AU  - Trivunović, Snežana
AU  - Bogdanović, Vladan
AU  - Čobanović, Ksenija
AU  - Janković, Dobrila
AU  - Stanojević, Dragan
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4254
AB  - Possible differences between composition of raw milk due to dairy farming system (organic vs conventional) as well as seasonal variations were investigated. The samples were analysed during one year. A total of 6.782 samples of raw milk were collected (4.496 from organic farming). Dairy farms were located in the northern part of Republic of Serbia (Province of Vojvodina). The principle of analysis of raw milk samples was in accordance with the methodology by midinfrared spectrometry and flow cytometry. The fixed effect of system of farming and season (winter, spring, summer and fall) have shown a high statistical significance (P  lt  0.01) on all examined milk parameters except fat, total solids and somatic cell count, where the impact was slightly lower (P  lt  0.05). Significant difference wasn't found in number of bacterial colonies (P > 0.05). Composition of milk is also affected by a number of other factors, therefore it is recommended to involve factors such as nutrition of dairy cows, breed and farm management.
AB  - Cilj rada je bio da se ispitaju razlike između sirovog mleka dobijenog u različitim sezonama i sistemima proizvodnje (organska/ konvencionalna). Uzorci mleka su sakupljani u toku čitave godine. Ukupno je sakupljeno 6782 (od čega 4496 iz organske proizvodnje). Farme su bile locirane na severnom delu Srbije (AP Vojvodina). Sirovi uzorci mleka su analizirani u skladu sa metodologijom infracrvene spektometrije i protočne citometrije. Fiksni uticaji sistema proizvodnje i sezone (zima, proleće, leto i jesen) su pokazali visoku signifikantnu značajnost (P  lt  0,01) na sve ispitivane parametre mleka osim na mlečnu mast, ukupnu suvu materiju i ukupan broj somatskih ćelija, gde je uticaj bio signifikantan na nivou (P  lt  0,05). Statistički značajna razlika nije pronađena u ukupnom broju bakterija (kolonija) (P > 0,05). Na sastav mleka takođe utiče i veliki broj drugih faktora, stoga je za preporuku da se u ispitivanje uključe i faktori poput ishrane mlečnih krava, rase i farmskog menadžmenta.
PB  - Institut za stočarstvo, Beograd
T2  - Biotechnology in Animal Husbandry
T1  - Composition of raw milk from conventional and organic dairy farming
T1  - Sastav sirovog mleka dobijen u sistemu konvencionalne i organske proizvodnje
EP  - 143
IS  - 2
SP  - 133
VL  - 32
DO  - 10.2298/BAH1602133K
ER  - 

@article{
author = "Kučević, Denis and Trivunović, Snežana and Bogdanović, Vladan and Čobanović, Ksenija and Janković, Dobrila and Stanojević, Dragan",
year = "2016",
abstract = "Possible differences between composition of raw milk due to dairy farming system (organic vs conventional) as well as seasonal variations were investigated. The samples were analysed during one year. A total of 6.782 samples of raw milk were collected (4.496 from organic farming). Dairy farms were located in the northern part of Republic of Serbia (Province of Vojvodina). The principle of analysis of raw milk samples was in accordance with the methodology by midinfrared spectrometry and flow cytometry. The fixed effect of system of farming and season (winter, spring, summer and fall) have shown a high statistical significance (P  lt  0.01) on all examined milk parameters except fat, total solids and somatic cell count, where the impact was slightly lower (P  lt  0.05). Significant difference wasn't found in number of bacterial colonies (P > 0.05). Composition of milk is also affected by a number of other factors, therefore it is recommended to involve factors such as nutrition of dairy cows, breed and farm management., Cilj rada je bio da se ispitaju razlike između sirovog mleka dobijenog u različitim sezonama i sistemima proizvodnje (organska/ konvencionalna). Uzorci mleka su sakupljani u toku čitave godine. Ukupno je sakupljeno 6782 (od čega 4496 iz organske proizvodnje). Farme su bile locirane na severnom delu Srbije (AP Vojvodina). Sirovi uzorci mleka su analizirani u skladu sa metodologijom infracrvene spektometrije i protočne citometrije. Fiksni uticaji sistema proizvodnje i sezone (zima, proleće, leto i jesen) su pokazali visoku signifikantnu značajnost (P  lt  0,01) na sve ispitivane parametre mleka osim na mlečnu mast, ukupnu suvu materiju i ukupan broj somatskih ćelija, gde je uticaj bio signifikantan na nivou (P  lt  0,05). Statistički značajna razlika nije pronađena u ukupnom broju bakterija (kolonija) (P > 0,05). Na sastav mleka takođe utiče i veliki broj drugih faktora, stoga je za preporuku da se u ispitivanje uključe i faktori poput ishrane mlečnih krava, rase i farmskog menadžmenta.",
publisher = "Institut za stočarstvo, Beograd",
journal = "Biotechnology in Animal Husbandry",
title = "Composition of raw milk from conventional and organic dairy farming, Sastav sirovog mleka dobijen u sistemu konvencionalne i organske proizvodnje",
pages = "143-133",
number = "2",
volume = "32",
doi = "10.2298/BAH1602133K"
}

Kučević, D., Trivunović, S., Bogdanović, V., Čobanović, K., Janković, D.,& Stanojević, D.. (2016). Composition of raw milk from conventional and organic dairy farming. in Biotechnology in Animal Husbandry
Institut za stočarstvo, Beograd., 32(2), 133-143.
https://doi.org/10.2298/BAH1602133K

Kučević D, Trivunović S, Bogdanović V, Čobanović K, Janković D, Stanojević D. Composition of raw milk from conventional and organic dairy farming. in Biotechnology in Animal Husbandry. 2016;32(2):133-143.
doi:10.2298/BAH1602133K .

Kučević, Denis, Trivunović, Snežana, Bogdanović, Vladan, Čobanović, Ksenija, Janković, Dobrila, Stanojević, Dragan, "Composition of raw milk from conventional and organic dairy farming" in Biotechnology in Animal Husbandry, 32, no. 2 (2016):133-143,
https://doi.org/10.2298/BAH1602133K . .