TY  - JOUR
AU  - Vucković, Goran
AU  - Bobić, Tina
AU  - Mijić, Pero
AU  - Gavran, Mirna
AU  - Gregić, Maja
AU  - Potocnik, Klemen
AU  - Bogdanović, Vladan
AU  - Gantner, Vesna
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5271
AB  - In order to estimate the variance components as well as the breeding value for daily milk production of Holstein cows in terms of heat stress defined as different THI threshold values (68, 70, and 72) 1,275,713 test-day records from 90,159 cows were used. Temperature-humidity index (THI) calculated from ambient temperature and relative humidity recorded in the barns on the milk recording day was used as the measure of heat stress. Daily milk production was analysed as a bivariate variable, in the normal conditions (under the set THIthreshold value), and in terms of heat stress (above the set THIthreshold value) using a model that accounted variances due to lactation stage, calving season, age at calving, breeding region, parity, permanent environment, interaction between hear and year, and individual animal. The estimated high genetic correlations between the daily milk production in normal and heat stress conditions, as well as high correlations among the EBVs in normal and heat stress conditions, point out that Holstein cows with high productivity in normal condition will sustain an alike level of production even in terms of heat stress. These results indicate that the Holstein cows are very well acclimatized to the environmental conditions at dairy farms in Croatia. However, these findings should be taken with caution, given that measurements of microclimate parameters were conducted only once at a milk recording day, so the reliability of such measurements could be questionable. In conclusion, in order to realize a completely unambiguous conclusion, further studies that include multiple daily measurements of microclimatic parameters in the farms facilities are necessary.
PB  - Croatian Dairy Union, Zagreb
T2  - Mljekarstvo
T1  - Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress
EP  - 209
IS  - 3
SP  - 201
VL  - 70
DO  - 10.15567/mljekarstvo.2020.0306
ER  - 

@article{
author = "Vucković, Goran and Bobić, Tina and Mijić, Pero and Gavran, Mirna and Gregić, Maja and Potocnik, Klemen and Bogdanović, Vladan and Gantner, Vesna",
year = "2020",
abstract = "In order to estimate the variance components as well as the breeding value for daily milk production of Holstein cows in terms of heat stress defined as different THI threshold values (68, 70, and 72) 1,275,713 test-day records from 90,159 cows were used. Temperature-humidity index (THI) calculated from ambient temperature and relative humidity recorded in the barns on the milk recording day was used as the measure of heat stress. Daily milk production was analysed as a bivariate variable, in the normal conditions (under the set THIthreshold value), and in terms of heat stress (above the set THIthreshold value) using a model that accounted variances due to lactation stage, calving season, age at calving, breeding region, parity, permanent environment, interaction between hear and year, and individual animal. The estimated high genetic correlations between the daily milk production in normal and heat stress conditions, as well as high correlations among the EBVs in normal and heat stress conditions, point out that Holstein cows with high productivity in normal condition will sustain an alike level of production even in terms of heat stress. These results indicate that the Holstein cows are very well acclimatized to the environmental conditions at dairy farms in Croatia. However, these findings should be taken with caution, given that measurements of microclimate parameters were conducted only once at a milk recording day, so the reliability of such measurements could be questionable. In conclusion, in order to realize a completely unambiguous conclusion, further studies that include multiple daily measurements of microclimatic parameters in the farms facilities are necessary.",
publisher = "Croatian Dairy Union, Zagreb",
journal = "Mljekarstvo",
title = "Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress",
pages = "209-201",
number = "3",
volume = "70",
doi = "10.15567/mljekarstvo.2020.0306"
}

Vucković, G., Bobić, T., Mijić, P., Gavran, M., Gregić, M., Potocnik, K., Bogdanović, V.,& Gantner, V.. (2020). Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress. in Mljekarstvo
Croatian Dairy Union, Zagreb., 70(3), 201-209.
https://doi.org/10.15567/mljekarstvo.2020.0306

Vucković G, Bobić T, Mijić P, Gavran M, Gregić M, Potocnik K, Bogdanović V, Gantner V. Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress. in Mljekarstvo. 2020;70(3):201-209.
doi:10.15567/mljekarstvo.2020.0306 .

Vucković, Goran, Bobić, Tina, Mijić, Pero, Gavran, Mirna, Gregić, Maja, Potocnik, Klemen, Bogdanović, Vladan, Gantner, Vesna, "Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress" in Mljekarstvo, 70, no. 3 (2020):201-209,
https://doi.org/10.15567/mljekarstvo.2020.0306 . .

TY  - JOUR
AU  - Vucković, Goran
AU  - Bobić, Tina
AU  - Mijić, Pero
AU  - Gavran, Mirna
AU  - Gregić, Maja
AU  - Potocnik, Klemen
AU  - Bogdanović, Vladan
AU  - Gantner, Vesna
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5295
AB  - Variance components for daily milk production as well as breeding value of dairy Simmentals for daily milk production in terms of heat stress defined as different values of THI threshold values (72, 74, and 76) were estimated using 1,636,192 test-day records provided by the Croatian Agricultural Agency. Temperature-humidity index (THI) calculated from ambient temperature and relative humidity recorded in the barns on the milk recording day was used as the measure of heat stress. Bivariate estimation model accounted variances due to lactation stage, calving season, age at calving, breeding region, parity, permanent environment, interaction between hear and year, and individual animal Obtained high genetic correlations between the daily milk production in normal and condition characterized by heat stress, as well as very high correlations between the EBVs in normal and heat stress conditions indicate animals' high level of acclimatization to the environment on dairy cattle farms. Since microclimate measurements were carried out only once at a milk recording day, these results should be taken with caution. Generally, further research with multiple daily measurements of the microclimate parameters in the facilities is necessary to provide a fully unambiguous conclusion.
PB  - Društvo genetičara Srbije, Beograd
T2  - Genetika
T1  - Estimation of genetic parameters and breeding values for daily milk production of dairy simmentals in terms of heat stress
EP  - 650
IS  - 2
SP  - 641
VL  - 52
DO  - 10.2298/GENSR2002641V
ER  - 

@article{
author = "Vucković, Goran and Bobić, Tina and Mijić, Pero and Gavran, Mirna and Gregić, Maja and Potocnik, Klemen and Bogdanović, Vladan and Gantner, Vesna",
year = "2020",
abstract = "Variance components for daily milk production as well as breeding value of dairy Simmentals for daily milk production in terms of heat stress defined as different values of THI threshold values (72, 74, and 76) were estimated using 1,636,192 test-day records provided by the Croatian Agricultural Agency. Temperature-humidity index (THI) calculated from ambient temperature and relative humidity recorded in the barns on the milk recording day was used as the measure of heat stress. Bivariate estimation model accounted variances due to lactation stage, calving season, age at calving, breeding region, parity, permanent environment, interaction between hear and year, and individual animal Obtained high genetic correlations between the daily milk production in normal and condition characterized by heat stress, as well as very high correlations between the EBVs in normal and heat stress conditions indicate animals' high level of acclimatization to the environment on dairy cattle farms. Since microclimate measurements were carried out only once at a milk recording day, these results should be taken with caution. Generally, further research with multiple daily measurements of the microclimate parameters in the facilities is necessary to provide a fully unambiguous conclusion.",
publisher = "Društvo genetičara Srbije, Beograd",
journal = "Genetika",
title = "Estimation of genetic parameters and breeding values for daily milk production of dairy simmentals in terms of heat stress",
pages = "650-641",
number = "2",
volume = "52",
doi = "10.2298/GENSR2002641V"
}

Vucković, G., Bobić, T., Mijić, P., Gavran, M., Gregić, M., Potocnik, K., Bogdanović, V.,& Gantner, V.. (2020). Estimation of genetic parameters and breeding values for daily milk production of dairy simmentals in terms of heat stress. in Genetika
Društvo genetičara Srbije, Beograd., 52(2), 641-650.
https://doi.org/10.2298/GENSR2002641V

Vucković G, Bobić T, Mijić P, Gavran M, Gregić M, Potocnik K, Bogdanović V, Gantner V. Estimation of genetic parameters and breeding values for daily milk production of dairy simmentals in terms of heat stress. in Genetika. 2020;52(2):641-650.
doi:10.2298/GENSR2002641V .

Vucković, Goran, Bobić, Tina, Mijić, Pero, Gavran, Mirna, Gregić, Maja, Potocnik, Klemen, Bogdanović, Vladan, Gantner, Vesna, "Estimation of genetic parameters and breeding values for daily milk production of dairy simmentals in terms of heat stress" in Genetika, 52, no. 2 (2020):641-650,
https://doi.org/10.2298/GENSR2002641V . .