添加蛋氨酸羟基类似物异丙醇酯(HMBi)对肉牛生产性能和屠宰性能的影响

Effects of supplementating different levels of 2-hydroxy-4(methylthio) butanoic acid isopropyl ester(HMBi) on growth and slaughter performance of beef cattle

试验旨在研究酒糟日粮中添加不同水平蛋氨酸羟基类似物异丙醇酯[2-hydroxy-4(me-thylthio)butanoic acid isopropyl ester,HMBi]对肉牛生产性能和屠宰性能的影响。采用单因子试验设计,选取30头日龄体重相近(232±18.7)kg健康杂牛(牦牛公牛×犏牛母牛),随机分为3个处理组,分别为对照组和添加HMBi 7.5和15 g/(头·d)组,每个处理10个重复。正式育肥试验90 d。结果表明,添加HMBi 15 g/(头·d)可显著提高肉牛平均日增重(P<0.05),较对照组提高了增重效益121元/头。添加HMBi 7.5 g/(头·d)对平均日增重无显著影响(P>0.05)。添加HMBi 15 g/(头·d)在整个育肥期内提高了净肉产量7.7 kg(P>0.05),较对照组提高了增肉效益230元/头。杂牛进行短期育肥具有较好的经济效益,可以通过营养调控手段提高杂牛日增重和净肉产量以提高养殖效益,肉牛日粮中HMBi的适宜添加水平为15 g/(头·d)。

The aim of this study was to investigate the effects of supplementating different levels of 2- hydroxy-4 （methyhhio） butanoic acid isopropyl ester （HMBi） on the growth and slaughter performance of beef cattle. A single factor experiment design was used and 30 healthy cattle （yak bulls ♂ × yak × jersey ♀ ） with similar age and body weight （232±18.7） kg were selected and were randomly divided into three treatment groups, control group, HMBi 7.5 and 15 g/（head, d） group, respectively. Each treatment had 10 repetitions. The formal finishing experiment last 90 days. The results showed that the addition of HMBi at the dosage of 15 g/day significantly increased the average daily gain （P〈0.05）, and increased the weight gain profit by 121 yuan/（head·d） compared with the control group. Addition of HMBi at the dosage of 7.5 g/（head·d） had no significant effect on the average daily gain （P〉0.05）. Throughout the whole 90 days of fattening period, addition of HMBi at the dosage of 15 g/（head·d） increased the net lean yield by 7.7 kg/（head·d） compared with the control group （P〉0.05）, increased lean gain profit by 230 yuan/（head·d）. Raising this breed of cattle has good economic benefits, the daily gain and net lean production can be manipulated through nutritional regulations, and the farming benefits can be promoted. The proper supplementary dosago of HMBi in ration of beef cattle is 15 g/（head· d）.