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热应激对不同泌乳阶段奶牛生产性能和血清激素浓度的影响

DOI: 10.3969/j.issn.1006-267x.2013.10.013

Keywords: 热应激,生产性能,激素,热休克蛋白70,奶牛

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Abstract:

本试验旨在研究热应激对不同泌乳阶段奶牛生产性能、血清激素及热休克蛋白70浓度的影响。试验采用二因子完全交叉(3×2)设计,选用胎次相近、3个不同泌乳阶段(泌乳前、中、后期)的荷斯坦奶18头,每个阶段6头;设计2个热应激期(热应激期与非热应激期)。结果表明:热应激显著降低了奶牛产奶量(P<0.05),极显著降低了奶牛干物质采食量(P<0.01);与非热应激期相比,奶牛在热应激期血清胰岛素、胰高血糖素、甲状腺素、瘦素浓度有下降的趋势,但差异不显著(P>0.05),三碘甲腺原氨酸、皮质醇和催乳素浓度均极显著下降(P<0.01),热休克蛋白70浓度极显著提高(P<0.01)。结果提示,热应激会严重影响奶牛血清激素和热休克蛋白70浓度,从而影响奶牛的生产性能;与泌乳中、后期相比,热应激对泌乳前期奶牛影响更大。

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