不同尿素添加水平对青年母水牛尿中嘌呤衍生物排出规律的研究

试验选取3头24月龄左右,体重相近的健康青年母水牛，采用随机区组试验设计，分别饲喂基础日粮+15 g/d尿素（处理A）、基础日粮+30 g/d尿素（处理B）和基础日粮+45 g/d尿素（处理C）组合的试验日粮。结果表明，随着尿素用量的增加，粗蛋白质采食量明显提高，营养物质的表观消化率、氮沉积率和氮的表观消化率均以处理B组最高，且与其它处理组差异显著(P<0.05)；尿中嘌呤衍生物的排出量仍以处理B组最高，与其它组差异不显著(P>0.05)；肌酸酐的排出量稳定在40 mmol/d左右，各处理间无显著差异（P>0.05）。由此说明，适量添加尿素有利于青年母水牛营养物质消化率的提高、氮的沉积和微生物氮的合成，而过量添加反而降低其添加效果。

Effect of Different Urea Addition in Ration on Excretion of Urinary Purine Derivatives in Young Buffalo

Three buffalos(24-month-old) was used for three period digestive-metabolism trial,three treatments were concentrate 3 kg+elephant-grass 16.6 kg+15 g urea(A group);3 kg +elephant-grass 16.6 kg+30 g urea(B group);3 kg +elephant-grass 16.6 kg+45 g urea(C group).The results showed that with the urea addition in ration increased,the apparent digestibility of the the feed nutrients,nitrogen balance and N apparent digestibility in treatment B were best(P<0.05);urinary excretion of PD no significant difference betw...