精料比例对皖南牛粗饲料采食量和日粮养分表观消化率的影响

Effect of Concentrate Proportion on Roughage Intake and Apparent Digestibility of Nutrients of Wannan Cattle

本试验研究精料比例对皖南牛粗饲料采食量和营养物质表观消化率的影响。30头去势的体重相近的18月龄皖南牛,随机分成5组,各组根据体重的1.9%、1.6%、1.3%、1.0%和0.7%补充精料,通过饲养试验和消化试验测定粗饲料采食量和日粮养分表观消化率。结果表明:皖南牛的粗饲料采食量随着精料饲喂量的减少而增加,总的干物质采食量(DMI)随着精料饲喂量的减少而降低;日粮的干物质(DM)、有机物(OM)、粗蛋白(CP)、粗脂肪(EE)和总能(GE)的表观消化率随着精料饲喂量的减少而降低;日粮中性洗涤纤维(NDF)和酸性洗涤纤维(ADF)的表观消化率随着精料的减少先升后降,精料饲喂量占体重1.0%的组的NDF和ADF表观消化率最高,分别为60.48%和57.07%。

The objective of this experiment was to study the effect of concentrate proportion on roughage intake and apparent digestibility of nutrients in diets of wannan Cattle. Thirty castrated Wannan cattle with 18-month-old and similar weights were randomly and equally divided into five groups that were provided a feed concentrate at 1.9%, 1.6%, 1.3%, 1.0% and 0.7% of their body weight. The roughage intake and apparent digestibility of nutrients were measured by feeding experiment and digestion trial. The results showed that the roughage intake increased with concentrate proportion decreasing, the total dry matter intake （DMI） decreased with concentrate proportion decreasing. The apparent digestibility of dry matter （DM）, organic matter （OM）, crude protein （CP）, ether extract （EE） and gross energy （GE） decreased with concentrate proportion decreased. The apparent digestibility of NDF and ADF increased first and then decreased with concentrate proportion decreased. The apparent digestibility of NDF and ADF of the group in which the concentrate was supplied at 1.0% of the body weight was the highest, which were 60.48% and 57.07% respectively.