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中国农学通报

中国农学通报 ›› 2009, Vol. 25 ›› Issue (24): 28-31.

所属专题： 生物技术； 畜牧兽医

• 畜牧 动物医学 蚕 蜂 • 上一篇    下一篇

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

杨 毅,梁荣嵘,刘庆华,梁学武   

  • 收稿日期:2009-09-15 修回日期:2009-10-08 出版日期:2009-12-20 发布日期:2009-12-20
  • 基金资助:

    福建省科技重大专项

The influence of heat stress, from mild to medium, on physiological index and milk yield of Holstein lactating cows

  • Received:2009-09-15 Revised:2009-10-08 Online:2009-12-20 Published:2009-12-20

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969

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％。

关键词: 半番鸭, 半番鸭, 北京鸭, MC1R基因, 克隆, 序列分析

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%.