The differences in heat stress resistance due to dairy cattle breed
The differences in heat stress resistance due to dairy cattle breed
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DOI：
10.15567/mljekarstvo.2017.0203
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发表时间：
2017-04-01
期刊：
影响因子：
1.2
通讯作者：
Potocnik, Klemen
中科院分区：
文献类型：
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作者：
Gantner, Vesna;Bobic, Tina;Potocnik, Klemen
考虑到全球快速的气候变化，为了减少奶农的经济损失，实现更可持续的养殖，在育种策略中实施耐热育种价值越来越有必要。繁殖值的估计需要确定温度-湿度指数（THI）阈值。因此，本研究的目的是确定的温度-湿度指数（THI）的阈值，每天的牛奶产量，每天的脂肪和蛋白质含量的牛奶生产的荷斯坦奶牛和奶牛西门塔尔在克罗地亚农场。为此，将克罗地亚5.679个农场饲养的70.135头荷斯坦牛的1.070，554个试验日记录和8.827个农场饲养的86.013头西门塔尔牛的1.300，683个试验日记录与2005年1月至2012年12月定期挤奶记录期间在畜棚中收集的环境温度和相对湿度记录进行了比较。由此可以得出以下结论：日产奶量阈值与胎次和品种密切相关（荷斯坦牛：68，69和72为第一，第二，3+胎次;西门塔尔牛：77为第一）;热应激条件下，日脂肪和蛋白质含量极显著降低（THI在66 - 80）在这两个，荷斯坦牛和西门塔尔牛，并在所有的奇偶性类;多胎牛比经产的热应激更耐;西门塔尔牛比荷斯坦牛更耐热应激。
Considering the rapid climate changes worldwide, with the purpose to reduce financial losses for dairy farmers and enable a more sustainable farming as well, there is an increasing necessity to implement breeding values for heat resistance in breeding strategies. The estimation of breeding values requires a determination of temperature-humidity index (THI) threshold value. Therefore, the objective of this study was to determine the temperature-humidity index (THI) threshold values for daily milk yield, daily fat and protein content of milk produced by Holsteins and dairy Simmentals in Croatian farms. With that purpose, 1.070,554 test-day records from 70.135 Holsteins reared on 5.679 farms and 1.300,683 test-day records from 86.013 Simmentals reared on 8.827 farms in Croatia were compared to records of ambient temperature and relative humidity collected in the barn, during regular milking recordings from January 2005 to December 2012. Accordingly the following conclusions could be drawn: threshold values for daily milk yield were highly dependant on the parity and breed (Holsteins: 68, 69 and 72 for 1st, 2nd, 3+ parity; Simmentals: 77 for 1st); daily fat and protein contents showed a highly significant decrease due to heat stress condition (THI in 66-80) in both, Holstein and Simmental cows, and in all parity classes; multiparous cows were more resistant to heat stress than primiparous; Simmental cows were more resistant to heat stress than Holsteins.