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Genetic parameters and breeding values for daily milk production of Holstein cows in terms of heat stress

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2020
5268.pdf (270.7Kb)
Authors
Vucković, Goran
Bobić, Tina
Mijić, Pero
Gavran, Mirna
Gregić, Maja
Potocnik, Klemen
Bogdanović, Vladan
Gantner, Vesna
article (publishedVersion)
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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 stres...s 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.

Keywords:
daily milk production / heat stress / genetic parameters / Holstein
Source:
Mljekarstvo, 2020, 70, 3, 201-209
Publisher:
  • Croatian Dairy Union, Zagreb

DOI: 10.15567/mljekarstvo.2020.0306

ISSN: 0026-704X

WoS: 000542670900006

Scopus: 2-s2.0-85086668615
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URI
http://aspace.agrif.bg.ac.rs/handle/123456789/5271
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Poljoprivredni fakultet

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