饲粮氮源构成对育成绵羊氮表观沉积率的影响

Effect of Dietary Nitrogen Source on Apparent Nitrogen Deposition of Hogget

利用氮平衡试验法，按５×５拉丁方设计，研究了５种处理的等氮等代谢能饲粮（精粗比约为３２６８）对东北细毛羊育成公羊氮表观沉积率的影响。试验结果表明，精料补充料中干玉米酒精糟占４１％的饲粮，其氮的表现沉积率（ＡＮＲＲ）为２７３８％，高于其它４种处理饲粮（Ｐ＜００５）。饲粮的氮表观沉积率与饲粮瘤胃未降解蛋白氮（ＵＤＮ）比例呈正相关（Ｐ＜００５）。

The results showed that supplemental concentrate adding 41% corn distiller′s corn dried grains (CDDG) had a 27.38% apparent nitrigen deposition, which was higher than that of diet including 22% soybean meal (SBM)+6.5% urea mixture (P<0.01). The apparent nitrogen deposition of diet was positively correlated to dietary by pass nitrogen rate (P<0.05).