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当前位置: 首页 > 文章 > ~(15)N尿素在兔体内消化吸收及利用机理研究.禁食粪兔对日粮尿素的利用 江苏农业学报 1999 (3) 50-54
Position: Home > Articles > Studies on the Mechanism of Absorption,Digestion and Utilization of ~(15)N urea in Rabbits Ⅲ.Utilization of Urea in Diet for Coprophagy prevented Rabbit Jiangsu Journal of Agricultural Sciences 1999 (3) 50-54

~(15)N尿素在兔体内消化吸收及利用机理研究.禁食粪兔对日粮尿素的利用

作  者：
周维仁;高家骅;章云;于亚君;陈明
单  位：
江苏省农业科学院饲料食品研究所
关键词：
兔;禁食粪;日粮尿素利用;同位素示踪
摘  要：
应用稳定同位素１ ５ Ｎ 尿素示踪技术，经套颈圈禁食粪兔对日粮尿素的消化代谢试验表明：兔在禁食粪的条件下，尿素氮平衡值陡降至３８１±１３ ｍ ｇ／ｄ，利用系数锐减为８０％ ±０４％ ，严重地抑制了兔对日粮中尿素的利用；软粪中存留标记氮在兔利用日粮尿素中占有一定的地位，其中，微生物群随着食粪过程进入胃肠道中，将尿素和氨直接转化成菌体蛋白，从而增强了人们对兔利用尿素氮的机理与途径的认识。
译  名：
Studies on the Mechanism of Absorption,Digestion and Utilization of ~(15)N urea in Rabbits Ⅲ.Utilization of Urea in Diet for Coprophagy prevented Rabbit
作  者：
ZHOU Weiren, GAO Jiahua, ZHANG Yun, YU Yajun, CHEN Ming (Institute of Food and Feed,Jiangsu Academy of Agricultural Sciences,Nanjing210014)
关键词：
rabbit;prevention of coprophagy;utilization of urea in the diet;isotopic tracing
摘  要：
Six 2 5 kg New Zealand male rabbits were selected to study the metabolism of urea N being utilized in rabbit using 15 N urea tracing technique.In order to prevent coprophagy,each rabbit had a collar in its neck.Basal diet which contained 16 01% of crude protein was fed to the rabbits for 120 g/d with additive 1% of 15 N urea(1 2 g).Results were showed as follows:① 15 N balance value in coprophagy prevented rabbits was 38 1±1 3 mg/d, 7 0%±0 3% to the 15 N urea uptake content,and utilization coefficient of 15 N was 8 0%±0 4%,about 39% to that of the normal rabbits.It could be seen that prevented corprophagy inhibited the utilization of 15 N in the diet.②Protein nitrogen in stomach and intestine of coprophagy prevented rabbits were 9 8% and 14 7%,14% and 23% to those of the normal rabbits,respectively.It could be inferred that microbiota in the normal rabbits played an important role on the transformation of 15 N urea to protein nitrogen.From study Ⅰ,Ⅱand Ⅲ it could be elucidated that:①rabbits could utilize urea in their diets;②strong caecum and coprophagy was the special physiological base for the utilization of urea;③microbiota was the key in use of non peotein nitrogen

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