玉米油对秸秆瘤胃降解率与肉牛日粮消化率的影响

Effects of Corn Oil on in sacco Degradability of Straw and Digestibility of Diets in Cattle

3头装有瘤胃瘘管的成年杂交黄牛 ,饲以加入 0、4 %或 8%玉米油的稻草和精料混合料 (2 :1)。用尼龙袋技术分别测定羊草、麦秸和稻草的干物质 (DM)和中性洗涤纤维 (NDF) 48h和 72 h的瘤胃降解率和日粮 DM,NDF和粗蛋白 (CP)的全消化道消化率。结果表明 ,随着玉米油添加量的增加 ,稻草、羊草和麦秸的DM和 NDF瘤胃降解率均有下降的趋势 ,但只有添加 8%玉米油时稻草 72 h的 NDF瘤胃降解率和添加 4 %或 8%玉米油时麦秸 4 8h的 NDF瘤胃降解率差异达到了显著水平 (P<0 .0 5)。日粮中添加 8%以下的玉米油对日粮 DM,CP,NDF的全消化道消化率没有影响 (P>0 .0 5)。这表明肉牛后部消化道对玉米油的影响可能有补偿作用。本试验的结论是 ,向肉牛或奶牛日粮中添加 8%以下的玉米油对饲料消化率没有影响 。

Three hybrid yellow cattle fitted with rumen cannulas were fed with rice straw and mixed concentrates(1∶2)which was added with 0, 4% or 8% corn oil. The nylon bag technique was used to determine the 48h and 72h rumen degradabilities of DM and NDF of wild rye, wheat straw and rice straw. The digesitbility of dietary DM, NDF or CP in the whole digestive tract was also determined. The DM and NDF degradabilities of rice straw, wild rye and wheat straw tended to decrease with the addition of corn oil. But only the decrease in 72h NDF degradability of rice straw (when adding 8% corn oil), and that in 48h NDF degradability of wheat straw (when adding 4% or 8% corn oil) reached significant level ( P <0.05). Addition of less than 8% corn oil did not influence the digestibility of dietary DM, NDF or CP in the whole digestive tract (P >0.05). This may indicate that the lower digestive tract has compensated for the influence of corn oil. It is concluded that adding less than 8% corn oil in the diet of cattle will not decrease the digestibility of diet, but adding corn oil or not will depend upon the actual economic benefit.