日粮粗蛋白质及能量水平对架子牛肥育效果影响的研究

试验采用2～3岁,体重在305～350kg的架子牛,按高蛋白高能量(精料1号)、高蛋白低能量(精料2号)、低蛋白高能量(精料3号)、低蛋白低能量(精料4号)四组日粮进行为期90d的肥育。试验结果表明,当架子牛体重在320～420kg的情况下,高蛋白高能量日粮组日增重明显高于其他三组(P<0.01)。当体重超过420kg以上时,高蛋白高能量组日增重与低蛋白高能量组比较差异显著(P<0.05),与其他两组比较差异极显著(P<0.01)。从经济效益上分析,由高到低,依次为高蛋白高能量、低蛋白高能量、高蛋白低能量、低蛋白低能量。结论:架子牛肥育前期日粮(按风干计)的粗蛋白质水平应达到13.5%～14.0%,消化能在11.60～11.70MJ/kg;肥育后期粗蛋白质水平应达到12%,消化能要在11.80MJ/kg以上。

Effects of Dietary Protein and Energy Level on Fattenning Performance of Cattle

2~3 year-old growing cattle with the body weight of 305 to 350 kg were randomly allotted to one of four dietary tests .This trial lasted for 90 days. The result showed that the group of high protein and high energy had significantly higher daily gain than others(P<0.01)when the B.W.of cattle was 320~420 kg. When the B.W.of cattle was over 420 kg, the average daily gain of the group fed with high protein and high energy was significantly higher(P< 0.05) than that of group fed with low protein and high energy and most significantly higher(P<0.01) than that of others. To economic income, the high protein and high energy had the best result, then low protein and high energy, high protein and low energy, low protein and low energy in turn. We can conclude that in the earlier period of fattening up the suitable crude protein level and digestible energy level (according to DM) for shore cattle should be 13.5% ~14.0% and 11.60~11.70 MJ/kg; but in the latter period, should be over 12% and 11.80 MJ/kg.