不同耐热性中国荷斯坦奶牛产奶量差异分析

doi:10.16431/j.cnki.1671-7236.2018.08.027

Abstract

Abstract:

In this study,Chinese Holstein lactating cows were assigned into two groups,namely heat stress tolerant cows (2 271 heads) and heat stress sensitive cows (2 024 heads) by respiratory and drooling score during heat stress period,and fixed model and mixed model including factors of farm,parity and milk stage were used to compare rectal temperature (RT) and milk production of these 2 groups of cows when they were in heat stress period and comfortable period.The results showed that the RT of heat stress tolerant cows were significant lower than that of heat stress sensitive cows (P<0.05).During comfortable period (May),the average daily milk yield of heat stress tolerant cows were slightly lower than that of heat stress sensitive cows,the difference was 0.68 kg and was not significant (P>0.05).During the period of heat stress,the heat stress tolerant cows performed better than heat stress sensitive cows in terms of the magnitude of decrease in milk production,especially during August when cows suffered severe heat stress (comparing to May,the decrease were 18.06% and 23.01%,respectively).In this study,two physiological performance indicators (respiratory and drooling score) were used for judging the heat stress resistance of lactating cows,and proved to be effective.The results could be helpful for assessing heat stress response and quantification of cow's heat stress,and adopting appropriate measurements to cool the cows at the right time to reduce economic losses in dairy farming.

Key words: Holstein dairy cows; heat resistance; rectal temperature; milk yield

CLC Number:

S823.9⁺1

LUO Hanpeng, LI Yuantao, LIU Jiali, XU Wei, ZHANG Hailiang, DONG Ganghui, LI Xizhi, HUANG Xixia, WANG Yachun. Analysis of Differences in Milk Yield of Chinese Holstein Dairy Cows with Different Heat Resistance[J]. , 2018, 45(8): 2263-2269.

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Analysis of Differences in Milk Yield of Chinese Holstein Dairy Cows with Different Heat Resistance

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