微生态制剂对犊牦牛瘤胃发酵和免疫力的影响

Effects of probiotics on rumen fermentation and immunityin yak calves

旨在探讨微生态制剂对青海犊牦牛瘤胃发酵和免疫力的影响,以期为微生态制剂在青海牦牛养殖生产中的推广应用提供参考依据。将45只青海犊牦牛随机分成3组(对照组、试验Ⅰ组、试验Ⅱ组),分别在精饲料中添加0、0.5、1.0 g/kg的微生态制剂,测定各处理组试验牛日增重等生长性能指标和瘤胃液中pH值、氨态氮浓度、挥发性脂肪酸浓度等瘤胃发酵指标,以及免疫球蛋白含量、细胞因子含量等免疫力指标。结果显示:试验Ⅰ组、Ⅱ组与对照组相比,平均日增重、氨态氮、乙酸、丁酸、总挥发性脂肪酸、IgG、IgA、IL-2、IFN-γ含量均显著提高(P<0.05);试验Ⅱ组与试验Ⅰ组相比,平均日增重、IgG、IL-2、IFN-γ含量均显著提高(P<0.05)。结果提示添加0.5 g/kg和1.0 g/kg微生态制剂均能显著提高青海犊牦牛的增重、瘤胃发酵和免疫力,提高牦牛养殖经济效益。

This paper aims to explore the effects of probiotics on Qinghai yak rumen fermentation and immunity and help the promotion and application of probiotics in Yak breeding in Qinghai. 45 Qinghai yak calves were randomly divided into 3 groups （ control group and test groups I and Ⅱ ） with 0, 0. 5 and 1 g/kg micro ecological agents in the fine feed, and determined gain weight growth performance and ru- men fluid pH, ammoniacal nitrogen concentration, volatile fatty acid concentration rumen fermentation parameters, and the immunoglobulin protein content and the amount of cell factors measurement indicators. Results showed that compared with the control group, the average daily gain, ammonia nitrogen, acetic acid, acid, total volatile fatty acids, IgG, IgA, IL-2, IFN-γ content increased significantly in test groups （P〈0.05）. Compared to test group Ⅰ , the average daily gain, IgG, IL-2, IFN-γ were significantly increased （P〈0. 05） in test group Ⅱ. Addition of 0. 5 g/kg and 1.0 g/kg of probiotics could significantly improve Qinghai yak weight, rumen fermentation and immunity, and get the economic benefits of yak breeding.