暖季放牧补饲对新疆褐牛公犊日增重及其血液激素水平的影响

试验旨在研究暖季放牧加补饲对褐牛公犊生长过程中不同时期血清激素水平变化的影响。选取10月龄新疆褐牛公犊70头,分为对照组(放牧)和试验组(放牧加补饲),分别于0、30、60、90和120 d时,测定公犊体重,并采集血样进行生长激素(growth hormone,GH)、睾酮(testosterone,T)、胰岛素(insulin,INS)、生长抑制素(somatostatin,SS)、甲状腺素(T4)、三碘甲腺原氨酸(T3)及糖皮质激素(corticosteroid,CORT)含量的检测。结果表明,在试验全期,两组公犊牛血清中GH含量差异均不显著(P>0.05);在90 d时,试验组公犊牛血清中T含量显著高于对照组(P<0.05),30、60和120 d时,两组差异均不显著(P>0.05);在60和90 d时,试验组公犊牛血清T4含量极显著高于对照组(P<0.01);在30、60和120 d时,两组公犊牛T3含量差异均不显著(P>0.05),90 d时,试验组公犊牛血清T3含量显著高于对照组(P<0.05)。提示,暖季天然草场放牧新疆褐牛公犊为其补饲合理的蛋白质和能量等营养物质能极显著提高公犊牛的日增重(P<0.01)。

Effect on the Blood Related of Hormone Level and Dairy Gain of Xinjiang Brown Bull Calves by Herding Supplementary Feeding

The experiment was aimed to study the effect on the relevance of hormone level and dairy gain of Xinjiang Brown Bull calves by herding supplementary feeding. Selected 70 10-month-old Xinjiang Brown calves, and divided them into control group (grazing) and experimental group (herding supplementary feeding). Respectively, in the experiment we measured male gives birth weight, and tested blood samples of the content of growth hormone, testosterone, insulin, somatostatin, thyroid group, three iodine a gland acid and glucocorticoids in 0, 30, 60, 90 and 120 d. The results showed that the sire calf serum GHcontents had no significant difference in test the whole period (P>0.05). The serum T content of test group calves was significantly higher than the control group in 90 d (P<0.05). There was no significant difference between the control group and the test group in 30, 60, and 120 d (P>0.05). The serum T4 content of test group calves was significantly higher than the control group in 60, 90 d (P<0.05).The sire calf serum T3 content of the groups was no significant difference in test the 30, 60, and 120 d (P>0.05). The calf serum T3 content of test group was significantly higher than the control group in 90 d (P<0.05). In conlusion, Xinjiang Brown Bull calves were reasonably supplementary the nutrients of protein and energy, could significantly improve the dairy gain of the male calves under the warm season natural pasture grazing conditions (P<0.01).