动物营养学报Issue(3)：918-925,8.DOI:10.3969/j.issn.1006-267x.2015.03.032
不同蛋白质水平补饲料对早期断奶犊牦牛生产性能和胃肠道发育的影响
Effect of Different Protein Levels of Supplementary Diets on Performance and Gastrointestinal Development in Early-Weaned Yak Calves
摘要
Abstract
This study was conducted to evaluate the effects of supplementary diets containing different levels of protein on performance, blood indexes and gastrointestinal development of early-weaned yak calves. Forty-eight healthy female Datong weaned yak calves aged about 3 months [(90 ± 5) days of age] were selected and assigned randomly to four groups with four replicates in each group and 3 heads per replicate. Yaks in con-trol group were grazed only, and those in experimental groups were grazed and fed isoenergetic ( net energy for gain=5.6 MJ/kg) supplementary diets contained 17%, 18% and 19% crude protein ( CP) , respectively. The pre-experiment lasted for 7 days, and the experiment lasted for 60 days. The results showed as follows: con-trast with control group, 1) the average daily gain were significantly increased by supplementary, and that in 17%, 18% and 19% supplementary groups was increased by 28.87%, 47.47%, 28.61% ( P<0.05) , respec-tively;2) the supplementary significantly increased the concentration of serum urea nitrogen, and that in 17%, 18% and 19% supplementary groups was increased 10.57%, 16.64% and 21.84% (P<0.05), respectively;3 ) the absolute weight and the relative weight of rumen and large intestine were significantly enhanced by sup-plementary diet containing 18% CP (P<0.05), and the villus height of duodenum, caecum and colon, and villus height/crypt depth of duodenum and caecum were significantly improved, too ( P<0.05) . These results indicate that supplementary diet is contributed to improve the production performance and gastrointestinal devel-opment of early-weaned female yak calves, and the optimal CP level is 18%.关键词
母犊牦牛/补饲料/蛋白质水平/生产性能/胃肠道发育Key words
female yak calves/supplementary diet/protein level/performance/gastrointestinal development分类
农业科技引用本文复制引用
周爱民,王威,王之盛,邹华围,彭全辉,冯宇诚,何晓林,尹满才,拉环..不同蛋白质水平补饲料对早期断奶犊牦牛生产性能和胃肠道发育的影响[J].动物营养学报,2015,(3):918-925,8.基金项目
青藏高原社区畜牧业行业科技项目(201203008) （201203008）
现代农业(肉牛牦牛)产业技术体系专项资金(CARS-38) （肉牛牦牛）
