营养限制和环境温度对蛋白质消化率、代谢率的影响

THE EFFECTS OF NUTRITION RESTRICTION AND TEMPERATURE ON DIGESTIBILITY AND METABOLISIBILITY OF PROTEIN OF UJIMQIN GROWTH RAMS

本试验以乌珠穆沁育成公羊为研究对象 ,在中国北方典型草原地区冬春季节测定不同持续时间的能量和蛋白质限制对于蛋白质消化率、代谢率的影响规律。研究结果表明 :(1)试验分期和试验期温度是独立于营养限制而显著影响蛋白质消化代谢的因素。(2)蛋白质消化率、代谢率随着营养限制的持续而呈现显著或极显著的下降趋势 ,当营养限制结束后恢复到对照组的水平。(3)蛋白质消化率受环境温度影响不明显 ,蛋白质代谢率随环境温度升高出现先降后升的明显趋势。(4)蛋白质消化率、代谢率的变化规律可以用干物质食入量、能量蛋白比、蛋白质食入量和试验分期、环境温度建立数学模型来描述。

This paper studied the digestibility and metabolisibility of dietary protein of Ujimqin growing rams under different restriction condition in typical grassland in cold weather.It shows that different restriction and compensation periods and temperature could influence the digestibility and metabolisibility of dietary protein dependly.The digestibility and metabolisibility of dietary protein decreased significantly during restriction,increased significantly during compesation.They could be described by modeling of different restriction and compensation periods(fixed factor),temperature(fixed factor) and intake amount of dry matter,dietary energy,and crude protein.The digestibility of dietary protein was not influenced by temperature significantly,the metabolisibility of dietary protein decreased then increased with raising of temperature.