| 轻微至中度热应激对荷斯坦奶牛生理指标及产奶性能的影响 |
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| 引用本文： | 杨 毅,梁荣嵘,刘庆华,梁学武.轻微至中度热应激对荷斯坦奶牛生理指标及产奶性能的影响[J].中国农学通报,2009,25(24):28-31. |
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| 作者姓名： | 杨 毅 梁荣嵘 刘庆华 梁学武 |
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| 作者单位： | 福建农林大学奶牛研究所,福州,350002 |
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| 摘 要： | 随机选用16头中国荷斯坦泌乳牛，研究轻微至中度热应激对其生理指标及产奶性能影响。结果表明：（1）泌乳牛在轻微热应激期（THI 74.5±1.0）的生理常数指标与非热应激期（THI 65.2±4.1）差异均不显著（P>0.05）；中度热应激期（THI 84.0±2.4）的各项生理常数指标均显著高于非热应激期（P<0.05）。从非热应激至中度热应激，THI每升高1，直肠温度上升0.04℃；从轻微至中度热应激，THI每升高1，泌乳牛的呼吸频率增加3.4次/min，脉搏增加2.6次/min。（2）在轻微和中度热应激期泌乳牛产奶量分别下降13.8%和26.9%（P<0.01），产奶量与THI呈极显著负相关（P<0.01）（R= -0.82），THI每上升1，产奶量下降1.9％。
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| 关 键 词： | 半番鸭 半番鸭 北京鸭 MC1R基因 克隆 序列分析 |
| 收稿时间： | 2009-09-15 |
| 修稿时间： | 2009-10-08 |
The influence of heat stress, from mild to medium, on physiological index and milk yield of Holstein lactating cows |
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| Yang Yi,Liang Rongrong,Liu Qinghua,Liang Xuewu.The influence of heat stress, from mild to medium, on physiological index and milk yield of Holstein lactating cows[J].Chinese Agricultural Science Bulletin,2009,25(24):28-31. |
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| Authors: | Yang Yi Liang Rongrong Liu Qinghua Liang Xuewu |
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| Institution: | (Institute of Dairy Cattle, Fujian Agricultural and Forestry University, Fuzhou 350002) |
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| Abstract: | 16 Chinese Holstein lactating dairy cows were selected randomly to study the influence of heat stress (from mild to medium) on physiological index and milk yield. The result show that: (1) The physiological index were no significant difference (P>0.05) between the mild heat stress period (THI 74.5±1.0) and no heat stress period (THI 65.2±4.1). The physiological index were significant difference (P<0.05) between the medium heat stress period (THI 84.0±2.4) and no heat stress period (THI 65.2±4.1). From mild to medium heat stress period, while THI rise 1, the respiratory rate of dairy cows increase 3.4n/min, rectal temperature increase 0.04℃;（2）During mild and medium heat stress period, the milk yield of dairy cow decrease 13.8% and 26.9% respectively (P<0.01), the relationship between milk yield and THI were negative (P<0.01) (R=-0.82), whileTHI rise 1, the milk yield of dairy cow decrease by 1.9%. |
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| Keywords: | lactating cowszz heat stresszz physical indexzz milk yieldzz |
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