奶牛乳尿素氮的研究进展

乳尿素氮(milk urea nitrogen,MUN)是指牛奶中尿素氮的浓度,是评定日粮蛋白质利用率的一个重要指标。测定和使用MUN能够判断日粮配方是否合理,管理计划是否恰当。作者综述了MUN的产生机制、监测方法及其影响因素,分析了目前应用该指标存在的问题,并预测了未来发展的趋势。总之,它的应用对动态预测反刍动物营养需要、科学配制日粮具有重要意义。

Research Overview of Milk Urea Nitrogen

Milk urea nitrogen(MUN) is the concentration of urea nitrogen in milk which is an major indicator meaning efficiency of utilization of dietary crude protein.Thus measuring and using MUN is a way to evaluate whether the diet formulation is suitable or not and whether the feeding program is reasonable or not.This paper reviewed the generation mechanism of MUN,the monitoring methods and its affected factors.It also analysed some current problems and predicted its future development.In a word,it is quite useful for the application of MUN to predict ruminant nutrient requirements and scientific diet formulation.