草原红牛及肉用群体饲料养分消化率和血液生化指标差异性研究

Studies on Digestibility and Blood Biochemical Indicator of China Red Steppe and Beef Strain

利用草原红牛、肉用群体(含1/4利木赞血草原红牛)作为试验牛种,按营养水平分为高、低营养水平组,对各组饲料营养消化率和血液生化指标进行测定。消化试验结果表明:肉用群体高营养组能量和粗蛋白的消化率极显著高于低营养组(p<0.01),高营养组粗脂肪和粗纤维消化率极显著低于低营养组(p<0.01);在高营养水平下,肉用群体粗蛋白消化率显著高于草原红牛(p<0.05),肉用群体粗脂肪消化率极显著低于草原红牛(p<0.01)。血液指标的测定结果表明:肉用群体高营养组谷草转氨酶、谷丙转氨酶和碱性磷酸酶含量极显著高于低营养组(p<0.01);在高营养水平下,肉用群体谷草转氨酶和碱性磷酸酶含量极显著高于草原红牛(p<0.01);在低营养水平下,肉用群体葡萄糖含量极显著高于草原红牛(p<0.01)。且各血液指标均在正常范围内。遗传因素和营养水平在谷草转氨酶和碱性磷酸酶活性上存在一定的互作效应。肉用群体的平均日增重随日粮能量和蛋白质水平的提高而提高。

China steppe red cattle and beef strain（containing 1/4 Limmousin blood） were used for materials and they were classified to high,low nutrition groups according to nutrition level in this experiment.Feed＇s nutrition digestion level and blood biochemical factors of each group were determined.The results showed that energy and crude protein digestion level of high nutrition group were higher than that of low nutrition group of beef strain（p〈0.01）,while crude fat and crude fibre digestion level of high nutrition group were lower than that of low nutrition group（p〈0.01）.At high nutrition level,crude protein digestion level of beef strain were higher than steppe red cattle（p〈0.05）,but the crude fat digestion level of beef strain were lower than steppe red cattle（p〈0.01）.The blood index＇s test results showed that glutamic-oxalacetic transaminase,glutamic-pyruvic transaminase and alkaline phosphatase＇s contents of high nutrition group were significantly higher than that of low nutrition group of beef strain（p〈0.01）.At high nutrition level,glutamicoxalacetic transaminase and alkaline phosphatase of beef strain were significantly higher than that of steppe red cattle （p〈0.01）.At low nutrition level,the glucose contents of beef strain was significantly higher than that of steppe red cattle（p〈0.01）,and each of blood indexes were in the normal standard.There was interacting effect between genetic factor and nutrition level in activity of glutamic-oxalacetic transaminase and alkaline phosphatase.The daily weight of beef strain increased with the increase of diets＇ energy and protein level.