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草业学报  2014 

异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: 10.11686/cyxb20140141, PP. 346-352

Keywords: 异丁酸,消化率,日增重,甲烷,西门塔尔牛

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Abstract:

试验选用36头12月龄左右、体况良好、体重相近的西门塔尔牛,随机分为4组,测定异丁酸(0,0.02,0.04和0.06g/kg·d)对日粮养分消化率、增重性能和甲烷排放的影响。结果表明,日粮添加异丁酸后,0.04和0.06g/(kg·d)组有机物(organicmatter,OM)消化率显著高于对照组,处理组粗蛋白(crudeprotein,CP)消化率显著高于对照组,无氮浸出物(nitrogenfreeextract,NFE)消化率差异不显著,0.04g/(kg·d)组中性洗涤纤维(neutraldetergentfibre,NDF)消化率显著高于对照组和0.02g/(kg·d)组(P<0.05),0.04g/(kg·d)组酸性洗涤纤维(aciddetergentfibre,ADF)消化率显著高于对照组和其他处理组(P<0.05);试验期间0.04g/(kg·d)组和0.06g/(kg·d)组日增重显著高于对照组(P<0.05),但与0.02g/(kg·d)组差异不显著;肉牛干物质采食量在试验期间0.04g/(kg·d)组显著低于对照组(P<0.05),其他组间差异不显著,0.04g/(kg·d)组和0.06g/(kg·d)组每千克增重消耗饲料显著低于对照组和0.02g/(kg·d)组(P<0.05);此外,玉米秸秆日粮中添加异丁酸后,甲烷能呈降低趋势,0.04g/(kg·d)和0.06g/(kg·d)组显著低于对照组(P<0.05)。由此推断日粮添加异丁酸后对增重性能\营养物质消化和降低甲烷排放有显著促进作用,适宜添加水平为0.04g/(kg·d)。

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