摘要
Abstract
Four pre-rumen lambs and four fawns were used to study nucleic acid metabolism.Nucleic acids dissolved in milk were fed to the animals at 5 levels.Total purine derivative excretion（including allantoin,uric acid,hypoxanthine and xanthine）（Y,mmol/d） in the urine increased with increasing exogenous purine inputs（X,mmol/d） by lambs,its linear equation was： Y=0.752＋0.662X（r=0.995,P〈0.001）.Total purine derivative excretion（Y,mmol/d） in the urine by fawns increased with increasing exogenous purine inputs（X,mmol/d）,its linear equation was： Y=0.559＋0.326X（r=0.990,P〈0.01）.Uric acid equivalents（Y,mmol/d） determined by using spectrophotometer in the urine of lambs was closely related with exogenous purine inputs（r=0.994,P〈0.01）.The predicted equation for the estimation of microbial nitrogen flow（Y,g/d） in the duodenum of sheep using uric acid equivalents was： microbial nitrogen flow Y=0.417＋0.396X.Similarly,the predicted equation for the estimation of microbial nitrogen flow（Y,g/d） in the duodenum of deer using the uric acid equivalents was： microbial nitrogen flow Y=-4.137＋1.245 X.The X（mmol/d） in the above two equations was the uric acid equivalents in the urine of lamb or fawns.关键词
反刍动物/微生物蛋白流量/尿酸当量Key words
ruminants/microbial nitrogen flow/uric acid equivalents分类
农业科技
