摘要
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0.06 g/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0.06 g/(kg·d)组有机物(organic matter,OM)消化率显著高于对照组,处理组粗蛋白(crude protein,CP)消化率显著高于对照组,无氮浸出物(nitrogen free extract,NFE)消化率差异不显著,0.04 g/(kg·d)组中性洗涤纤维(neutral detergent fibre,NDF)消化率显著高于对照组和0.02 g/(kg·d)组(P<0.05),0.04 g/(kg·d)组酸性洗涤纤维(acid detergent fibre,ADF)消化率显著高于对照组和其他处理组(P<0.05);试验期间0.04 g/(kg·d)组和0.06 g/(kg·d)组日增重显著高于对照组(P<0.05),但与0.02 g/(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,0.04 g/(kg·d)组和0.06 g/(kg·d)组每千克增重消耗饲料显著低于对照组和0.02 g/(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,0.04 g/(kg·d)和0.06 g/(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0.04 g/(kg·d)。
Thirty-six Simmental beef cattle （12-month-old） consuming a corn straw diet were randomly divided between four treatments supplemented by four levels of isobutyrate （0,0.02,0.04 and 0.06 g/kg · d） to evaluate the effects of isobutyrate on daily gain,dietary nutrient digestion and methane emissions.Organic matter digestibility of the cattle supplemented with isobutyrate at 0.04 and 0.06 g/（kg · d） were significantly （P＜0.05） higher than that of the controls.Crude protein digestibility of the isobutyrate supplemented cattle was significantly higher than that of the controls but nitrogen-free extract digestibility was not affected.Neutral detergent fibre digestibility of the cattle supplemented 0.04 g/（kg · d） were significantly （P＜0.05） higher than in the controls.Acid detergent fiber digestibility of the cattle supplemented 0.04 g/（kg · d） were significantly （P＜0.05） higher than in the controls and other groups.Furthermore,final body weights were affected by isobutyrate supplementation with 0.04 g/（kg · d） （P＜0.05）,and the average daily gains of cattle supplemented 0.04 and 0.06 g/（kg · d） were increased significantly （P＜0.05）.Dry matter intake of cattle supplemented 0.04 g/（kg· d） were significantly （P＜0.05） lower than in the controls.The feed conversion rates were improved significantly （P＜0.05） by the supplementation of isobutyrate at 0.04 and 0.06 g/（kg · d）.In addition,the methane emissions were significantly （P＜0.05） reduced from cattle supplemented 0.04 and 0.06 g/（kg · d）.The results indicated that average daily grain,nutrient digestion and methane emissions of Simmental beef cattle could be improved by supplemental isobutyrate.The optimal dose of isobutyrate supplementation was 0.04 g/（kg · d）.
出处
《草业学报》
CSCD
北大核心
2014年第1期346-352,共7页
Acta Prataculturae Sinica
基金
山西省科技厅攻关项目(20120311021-2)
山西雁门关畜牧经济区科技推广项目(201204)资助
关键词
异丁酸
消化率
日增重
甲烷
西门塔尔牛
isobutyrate
digestibility
average daily gain
methane emissions
Simmental beef cattle
