日粮蛋白质摄入量对泌乳奶牛氮排泄量的影响

被引:58
作者
翟少伟
机构
[1] 集美大学厦门市饲料检测与安全评价重点实验室
关键词
日粮蛋白质摄入量; 尿氮; 粪氮;
D O I
暂无
中图分类号
S823.4 [];
学科分类号
摘要
采用3个重复的4×4的拉丁方试验设计,给体重、产奶量和泌乳天数接近的12头经产荷斯坦牛饲喂4种等能量水平、不同蛋白质水平(13.2%、14.1%、15.0%和16.2%,干物质基础)的日粮,来研究不同日粮蛋白质摄入量的泌乳奶牛尿氮、粪氮和总氮排泄量(尿氮+粪氮)变化情况。整个试验期共56d,每期14d,第1天~第10天为调整期,第11天~第13天为粪尿收集期。结果表明,奶牛氮摄入量存在极显著差异(P<0.01);随着日粮蛋白质摄入量的增加,不同处理组奶牛的产奶量差异不显著(P>0.05);奶牛的尿氮、粪氮和总氮排泄量随氮摄入量的增加而增加,不同处理组奶牛的尿氮排泄量有极显著差异(P<0.01),总氮排泄量有显著差异(P<0.05),但各处理组间的粪氮排泄量无显著差异(P>0.05)。适当控制奶牛氮摄入量是泌乳奶牛氮素减排首要考虑的营养措施。
引用
收藏
页码:56 / 59
页数:4
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