畜牧兽医学报2012，Vol.43Issue(8)：1239-1246,8.
日粮阴阳离子平衡(DCAB)对热应激肉牛生产性能的影响
Effects of Dietary Cation-anion Balance on Performance of Heat-stressed Beef Cattle
摘要
Abstract
The objective of this trial was to study the effects of different DCAB on the production performance, blood chemistry and lymphocyte apoptosis of heat-stressed beef cattle. 30 Simmen-tal cattle with similar weight ( (450±10) kg) were randomly divided into three groups, every group contains ten cattle. The diets of three experimental groups was group I (control group, , DCAB, 108 meq o kg-1 DM) , group Ⅱ (228 meq o kg-1 DM ), group Ⅲ (347 meq o kg-1 DM). The results showed that, under the condition of heat stress, different DCAB value in diet didn't influence rectal temperature, while the respiratory rate decreased linearly with increasing DCAB (P＜0. 05) . Compared with control group, daily weight gain of beef cattle in group Ⅱ and Ⅲ increased 29% (P＜0. 05＝ and 25% (P＜0. 05＝, respectively, feed conversion(feed/gain)decreased by 17. 34% (P＜0. 05＝ and 11.46% (P＞0. 05), respectively. With the increasing DCAB, dietary NDF and ADF apparent digestibility improved (P＞0. 05), Ca, ash apparent digestibility showed quadratic change, crude protein and crude fat apparent digestibility had no significant difference. Compared with the control group, serum T4 levels of group Ⅱ and group Ⅲ were increased 58. 1% (P＜0. 05＝ and 31. 9% (P＞0. 05), respectively, SOD levels increased 18. 98% (P＞0. 05) and 48. 18% (P＞0. 05 ), respectively. Increasing DCAB had no significant effect on serum glucose and urea nitrogen, albumin. Increased DCAB could significantly reduce lymphocytes early apoptosis (P＜0. 01＝ , late apoptosis (P＜0. 01＝ and total apoptosis rate (P＜0. 01＝ , reduce the proportion of lymphocytes (P＜0. 05＝ in peripheral blood of beef cattle, and improve the ability to resist heat stress. In conclusion, the suitable level of DCAB was 228 meq o kg-1 DM in diet of heat-stressed beef cattle.关键词
肉牛/热应激/离子平衡/生产性能/细胞凋亡Key words
beef cattle/ heat stress/ cation-anion balance/ production performance/ apoptosis分类
农业科技引用本文复制引用
曹玉凤,王美美,李秋凤,高艳霞,于海川,李建国,冯志华,陈福音,崔秋佳,赵会利..日粮阴阳离子平衡(DCAB)对热应激肉牛生产性能的影响[J].畜牧兽医学报,2012,43(8):1239-1246,8.基金项目
国家肉牛牦牛产业技术体系建设专项资金资助(CARS-38) （CARS-38）
河北省科技支撑计划(10220401D) （10220401D）
