饲粮蛋白质水平对舍饲育肥牦牛生长性能、养分表观消化率及血清生化指标的影响  

Effects of feed protein levels on growth performance,nutrient apparent digestibility and serum biochemical indexes of house-feeding fattening yaks

作　　者：狄亚鹏 何振富[2] 陈平 王斐[2] 赵生国[1] 谢建鹏 DI Ya-peng;HE Zhen-fu;CHEN Ping;WANG Fei;ZHAO Sheng-guo;XIE Jian-peng

机构地区：[1]甘肃农业大学动物科学技术学院,甘肃兰州730070 [2]甘肃省农业科学院畜草与绿色农业研究所,甘肃兰州730070

出　　处：《饲料研究》2024年第6期1-5,共5页Feed Research

基　　金：甘肃省农业科学院科研条件建设及成果转化项目(项目编号:2021GAAS51)。

摘　　要：试验旨在探究不同粗蛋白水平饲粮对冷季舍饲集中育肥牦牛生长性能、养分表观消化率及血清生化指标的影响。试验选取体况良好、体重(180.00±11.67)kg的公牦牛30头,随机分为3组,每组10个重复,每个重复1头牦牛。设计3个粗蛋白水平分别为12.5%(Ⅰ组)、15.5%(Ⅱ组)和18.5%(Ⅲ组)的全混合饲粮(TMR)。预试期30 d,正式试验期90 d。结果显示,Ⅰ组、Ⅱ组牦牛的总增重、平均日增重显著高于Ⅲ组(P<0.05);Ⅲ组牦牛的料重比显著高于Ⅰ组、Ⅱ组(P<0.05)。Ⅱ组、Ⅲ组牦牛的粗灰分表观消化率显著高于Ⅰ组(P<0.05)。Ⅲ组牦牛血清中谷丙转氨酶(ALT)活性显著高于Ⅱ组(P<0.05);Ⅲ组尿素氮(BUN)含量显著高于Ⅰ组、Ⅱ组(P<0.05)。研究表明,中蛋白质水平饲粮在牦牛育肥过程所呈现的育肥效果较好,冷季集中育肥牦牛推荐饲粮蛋白质水平为15.5%。The purpose of the study was to investigate the effects of different crude protein levels on the growth performance,nutrient apparent digestibility and serum biochemical indexes of house-feeding intensive fattening yaks fed in cold season.In this study,30 male yaks with good body condition and weight of(180.00±11.67)kg were randomly divided into three groups,with 10 replicates in each group and one yak in each replicate.Three crude protein levels were designed for total mixed diets(TMR),which were 12.5%(GroupⅠ),15.5%(GroupⅡ),and 18.5%(GroupⅢ).The pre-test period was 30 days,and the formal test period was 90 days.The results showed that the total weight gain and average daily weight gain of yaks in GroupⅠand GroupⅡwere significantly higher than those in GroupⅢ(P<0.05).The feed to weight ratio of yaks in GroupⅢwas significantly higher than that in GroupⅠand GroupⅡ(P<0.05).The apparent digestibility of crude ash in GroupⅡand GroupⅢwas significantly higher than that in GroupⅠ(P<0.05).The activity of alanine aminotransferase(ALT)in yak serum of GroupⅢwas significantly higher than that in GroupⅡ(P<0.05).The content of urea nitrogen(BUN)in GroupⅢwas significantly higher than that in GroupⅠand GroupⅡ(P<0.05).The study indicates that the fattening effect of medium protein level diet in the yak fattening process is better,and the recommended protein level of yak diet in the cold season is 15.5%.

关 键 词：牦牛 集中育肥 蛋白质水平 生长性能 养分表观消化率 血清生化指标 

分 类 号：S823[农业科学—畜牧学]