2-甲基丁酸对西门塔尔牛增重、日粮养分消化和甲烷排放的影响

doi:10.16431/j.cnki.1671-7236.2016.08.013

摘要/Abstract

摘要：

试验旨在研究2-甲基丁酸对西门塔尔牛日粮养分消化率、增重性能及甲烷排放的影响。选择12月龄左右、发育正常及体重相近的西门塔尔公牛36头，随机分为4组，即对照组及试验1～3组，每组9头牛，分别饲喂添加0、1.0、2.0及3.0 g/kg体重2-甲基丁酸的玉米秸秆日粮，测定日粮养分消化率、西门塔尔牛增重性能及甲烷的排放情况。试验期70 d。结果表明，试验2、3组西门塔尔牛有机物质（OM）消化率较对照组显著提高（P<0.05）；3个试验组粗蛋白质（CP）消化率均较对照组显著提高（P<0.05），但无氮浸出物（NFE）消化率在各组间差异不显著（P>0.05）；试验2组西门塔尔牛中性洗涤纤维（NDF）消化率显著高于对照组和试验1组（P<0.05），而其酸性洗涤纤维（ADF）消化率则显著高于其他各组（P<0.05）；试验2、3组西门塔尔牛试验期间平均日增重显著高于对照组（P<0.05），但其在试验1组与对照组间差异不显著（P>0.05）；与对照组相比，试验2组的干物质采食量显著降低（P<0.05），试验2、3组料重比也显著降低（P<0.05）；在日粮中添加2-甲基丁酸后，西门塔尔牛的甲烷排放呈降低趋势，试验2、3组排放的甲烷能显著低于对照组（P<0.05）。由以上结果推断，在日粮中添加2-甲基丁酸可促进西门塔尔牛的生长及对营养物质消化，同时可有效降低甲烷排放，2-甲基丁酸的适宜添加水平为2.0 g/kg体重。

关键词: 2-甲基丁酸; 消化率; 日增重; 甲烷; 西门塔尔牛

Abstract:

The objective of this study was to evaluate the effects of 2-methylbutyrate on daily gain,dietary nutrient digestion and methane emissions in Simmental cattle.Thirty-six Simmental cattle (12-month-old) consuming a corn straw diet were divided randomly into four groups (control group,experimental groups 1,2 and 3) and supplemented with four levels of 2-methylbutyrate as 0,1.0,2.0 and 3.0 g/(kg·BW),respectively.Dietary nutrient digestibilities,average daily gain and methane emissions were determined.The results showed that OM digestibilities of the cattles in experimental group 2 and 3,CP digestibilities of the cattles in experimental groups 2 were significantly higher than that in control group (P<0.05).NFE digestibilities were not affected by adding 2-methylbutyrate (P>0.05).NDF digestibilities of the cattles in experimental group 2 were significantly higher than that in control group and experimental group 1 (P<0.05),while their ADF digestibility were significantly higher than that in control and other experimental groups (P<0.05).Compared with control group,the average daily gains of cattles increased significantly in experimental groups 2 and 3 (P<0.05),the dry matter intakes of cattles decreased significantly in experimental group 2 (P<0.05),and the feed gain ratio decreased significantly in experimental groups 2 and 3 (P<0.05).In addition,the methane emissions were decreased significantly in experimental groups 2 and 3 (P<0.05).The results indicated that the average daily gain,nutrient digestion could be improved,and methane emissions could be restrained by supplementing 2-methylbutyrate in Simmental beef cattle,the optimal dose of 2-methylbutyrate supplementation was 2.0 g/(kg·BW).

Key words: 2-methylbutyrate; digestibility; average daily gain; methane emissions; Simmental cattle

中图分类号:

S816.7

郭建兵, 王聪, 王江琴. 2-甲基丁酸对西门塔尔牛增重、日粮养分消化和甲烷排放的影响[J]. 《中国畜牧兽医》, 2016, 43(8): 2020-2025.

GUO Jian-bing, WANG Cong, WANG Jiang-qin. Effects of 2-methylbutyrate on Daily Gain,Dietary Nutrient Digestion and Methane Emissions in Simmental Cattle[J]. , 2016, 43(8): 2020-2025.

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