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品系,胎次,泌乳阶段对荷斯坦乳牛耐热性的影响
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摘要:
根据合肥奶牛场(A场),保健奶牛场(B场)1990年和1991年夏季的生产记录和该地的气象资料,分析不同品系,胎次和泌乳阶段对荷斯坦乳牛耐热性的影响。结果表明:品系对荷斯坦乳牛耐热性具有显著影响,纯血丹麦荷斯坦乳牛耐热性显著低于场内其他乳牛品系,其他品系间无显著差异,胎次增加,乳牛耐热性趋于降低,其中以第1胎最强,第3胎最弱,且胎次对A场乳牛耐热性有显著影响;泌乳阶段对乳牛耐热性影响不显著。
关键词:  品系 胎次 泌乳阶段 耐热性 荷斯坦乳牛
DOI:
基金项目:
Effects of Strain, Parity and Lactation Stage on Heat Tolerance of Holstein Cows
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Abstract:
The productive records of dairy herds in two Dairy Farm and the meteorological data inHefei during the summers of 1990 and1991 were used for studying the effects of strain parityand lactation stage on heat tolerance of dairy cows.There was significant difference betweenstrains in the heat tolerance of dairy cows.Pure bloed America Holstein cows and their crossblood cows had the highest heat tolerance,Baojian Holstein cows and their cross blood cows hadhigher heat tolerance, while pure Danish Holstein cows had the lowest heat tolerance.The heattolerance approximately showed a decline tendency with the increase of the parity,Dairy cows inthe first parity had the highest heat tolerance,and those in the third parity had the lowest heattolerance.The lactation stage had no significant in fluence on the heat tolerance of dairy cows.
Key words:  Strain,Parity,Lactation stage,Heat tolerance,Holstein cows,

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