西荷杂交犊牛生长性能及耐热性的研究

Growth performance and heat tolerance in dairy cows of Simmental×Holstein F1

本试验旨在研究西门塔尔牛与荷斯坦牛的杂交后代犊牛的生长性能和耐热性。选择15头刚出生的西荷杂交牛作为试验组,15头同期出生荷斯坦牛为对照组,分别测定了0、3、6月龄的体重体尺指标,并在热应激状态下测定了血液生化指标和HSP70的含量。结果表明:3月龄时,试验组的体高显著高于对照组(P<0.05),尤其在体重和胸围方面试验组优于对照组,差异极显著(P<0.01)。6月龄时,试验组的胸围、体重均优于对照组,差异显著(P<0.05)。在热应激期间,试验组的SOD和HSP70含量比对照组分别高出18.3%和26.7%,差异显著(P<0.05);MDA、GSH-SP、T3、T4、COR等指标组间差异不显著(P>0.05)。结论:西门塔尔牛与荷斯坦牛的杂交牛在犊牛期生长发育效果优于同龄荷斯坦犊牛,而且在热应激状态下表现出良好的耐热性。

The present experiment aimed to study the growth performance and heat tolerance in dairy cows of Simmental×Holstein F1.Fifteen Simmental×Holstein calves were designed as a treatment group and 15 Holstein calves as a control group.Weight and body size indexes of calves were measured in 0,3 and 6 months after birth.Serum biochemical indexes and HSP70 contents were determined in heat stress.The results showed that at 3 months after birth,the body height in treatment group was higher than that in control group（P〈0.05）; the body weight and chest of the treatment group were higher than that in the control group（P〈0.01）.The body weight and chest in treatment were higher than that in the control（P〈0.05） in 6 months.Compared with the control group,in heat stress the SOD content of the treatment group was 18.3% higher,the HSP70 was 26.7% higher（P〈0.05）.For MDA,GSH-SP,T3,T4,COR,the control group and the treatment group did not differ significantly（P〉0.05）.These results indicated that Simmental×Holstein calves had higher growth performance and heat tolerance than Holstein calves.