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夏季高温期应用热缓解剂对黑白花乳牛血液内分泌水平及产乳量的影响
Effects of Heat-Alleviators on Endocrine Levels of Blood and Milk Yield of Dairy Cattle in Summer Hot Season
【摘要】 在舍内日平均温度30.7±1.33℃和相对湿度75.6±2.50%的条件下,以放射免疫分析法测定黑白花乳牛在高温期应用热应激缓解剂后,外周血液中皮质醇(Cortisol)、T4、T3分泌的水平和T4/T3比值的变化。结果表明:应用本制剂后可明显提高Cortisol分泌的水平,试验组比对照组提高75.3%,差异极显著(P<0.01);T4、T3分泌的水平和T1/T3的比值,试验组比对照组分别提高13.5%、7.7%和5.5%,差异不显著(P>0.05)。产乳量试验组比对照组提高11.0%,差异极显著(P<0.01),提示内分泌水平的变化与产乳量的提高相一致。
【Abstract】 The endocrine levels of Co, T4, T3 in peripheral blood and the changes of T4/T3 ratio were tested by radio immunoassay after applications of heat-stress alleviators to dairy cattle. With the mean daily house temperature of 30. 7±1. 33℃ and the relative humidity of 75. 6±2. 50% in summer hot season. The results show that the Co levels in the test groups increased remarkably by 75. 3% with a significant difference (P<0. 01), and the levels of T4, T3 and T4/T3 ratios in the test groups increased by 13. 5% , 7.7% and 5. 5% respectively, with a significant difference (P>. 0. 05) compared to the control group. The milk yield increased by 11. 0% with a significant difference (P<0. 01). The above results show that the changes of the endocrine levels should be identical with the increase in the milk yield.
- 【文献出处】 农业工程学报 ,Transactions of The Chinese Society of Agricultural Engineering , 编辑部邮箱 ,1996年01期
- 【分类号】S823.91
- 【被引频次】5
- 【下载频次】21