日喂饲料量对绵羊尿中嘌呤代谢物和瘤胃微生物蛋白质产量的影响

The Effect of Ration on The Purine Derivative Excretion and the Microbial Prtein Yeild of the Rumen in Sheep

根据４×４拉丁方设计，４只体重相似（４５ｋｇ）的阉公绵羊（Ｂｌａｃｋｆａｃｅ×Ｓｕｆｆｏｌｋ）在不同试验期分别饲喂４００，８００，１２００和１６００ｇ／ｄ配合饲料（ＧＤ），相应采食量为７．２２，１４．４４，２１．１８和２８．８７ｇＤＭ／ｋｇＢＷ。尿中嘌呤代谢物排泄量（ＰＤ）和瘤胃微生物蛋白质产量（ＭＰＹ）分别为３．５６，７．０５，１１．２８，１７，５９ｍｍｏｌ／ｄ和１２．０，２０．７，２２．８，２８．３ｇＭＮ／ｋｇＤＯＭＲ．日喂饲料量增加对消化率影响不大，却明显提高了蛋白质的生物学价值（ＡＢＶ）和净利用率（ＮＰＵ）．

A trial with four 2-wk periods was cunducted with four wether(Blackface ×Suffolk)given 400,800, 1200 and 600g/d of diet referred to as GP in a 4×4Latin Square design. The purinederivative exeretion and the microbial proetein yeilds were 3.56.7.05,11,28 and 17.59 mmol/d,and 12.0,20.7,22. 8 and 28.3gMN/kgDOMR for 7.22,14.44,21,18 and 28.87 g DM /kg BW of intake level. The ABV and NPU of protein were increased from -25.9 and -26.1 to 45.5%and27.1%(P<0.01)