不同精粗比日粮对滩羊生产性能及消化代谢的影响

Effects of diets with different concentrate to forage ratios on the productive performance and digestive metabolism of Tan sheep

为了研究不同精粗比日粮对滩羊生产性能及消化代谢的影响,试验选择宁夏滩羊公羔羊33只,随机分为3组,每组11只,试验Ⅰ组、试验Ⅱ组、试验Ⅲ组分别饲喂精粗比为75∶25、50∶50、35∶65的日粮,进行饲养试验和消化试验。结果表明:试验Ⅰ组滩羊体重增长最快,总增重极显著高于试验Ⅱ组和试验Ⅲ组(P<0.01),平均日增重达165.17 g;精料比例从35%增加到75%明显提高了干物质和粗脂肪的表观消化率,蛋白质的表观消率也有所提高,但提高幅度较小。说明精粗比为75∶25的日粮短期育肥效果最优。

To study the effects of diets with different concentrate to forage ratios on the productive performance and digestive metabolism of Tan sheep,33 male lambs of Ningxia Tan sheep were selected and randomly divided into 3 groups of 11 lambs each in the test. The experimental groups Ⅰ,Ⅱ,and Ⅲ were fed diets with the concentrate to forage ratios of 75 to 25,50 to 50,and 35 to 65,and then the feeding experiment and digestion test were conducted. The results showed that the body weight of Tan sheep in the experimental group Ⅰ was the fastest and the total weight gain was significantly higher（ P〈0. 01） than that of the experimental groups Ⅱ and Ⅲ,while the average daily gain of the experimental group Ⅰ was up to 165. 17 g. The apparent digestibility of dry matter and crude fat was obviously increased when the percentage of concentrate was increased from 35% to 75%,and the apparent digestibility of crude protein was increased somewhat,but it was increased to a lesser extent. The results indicate that the diet with the concentrate to forage of 75 to 25 has the optimal short- term fattening effect.