控释尿素对藏羊瘤胃氨氮和微生物蛋白质的影响

作者旨在探讨控释尿素对藏羊瘤胃氨氮和微生物蛋白质合成的影响。试验选4只2岁藏羊，安装永久性瘤胃瘘管，分期定量饲喂不同粗蛋白质日粮：含尿素日粮（粗蛋白质含量为10.79%）、无尿素日粮（粗蛋白质含量为10.75%）、控释尿素日粮（粗蛋白质含量为10.73%）。结果表明，含尿素日粮瘤胃pH和氨氮浓度在一天中变化较快，而无尿素日粮和控释尿素日粮变化较为平缓，控释尿素日粮微生物蛋白质合成量虽然变化幅度较大，但能量与氨氮释放同步，微生物蛋白质合成量较大，充分把食用氮转化为微生物蛋白质。控释尿素日粮与含尿素日粮、无尿素日粮存在极显著差异（P<0.01），且控释尿素在瘤胃pH、氨氮浓度和微生物蛋白质含量方面均优于含尿素日粮和无尿素日粮，从而表明采用控释尿素日粮对藏羊补饲具有良好的效果，是反刍家畜安全、高效的粗蛋白质营养日粮。

Effect of Rumen NH3-N and MCP of Tibetan Sheep with Control-releasing Urea Diet

The aim of this study is to discuss the effect of rumen NH3-N and MCP of Tibetan sheep with control-releasing urea diet.Four two-year old Tibetan sheep fitted with permanent rumen fistula were fed quantificational different CP diet(containing urea diet(CP%=22.12%),without urea diet(CP%=22.02%),control-releasing urea diet(CP%=21.97%) respectively every period. The results indicated that: pH and NH3-N concentration change quickly in rumen of Tibetan sheep with contain urea diet in a day,but slowly with without urea diet and control-releasing urea diet.Changing range of MCP is great,but releasing speed of energy and NH3-N is synchronous,compounding quantity of MCP is very much.There is terribly remarkable differences between control-releasing urea diet and containing urea diet,so is there between control-releasing urea diet and without urea diet(P<0.01).pH,NH3-N concentration and MCP content in rumen of Tibetan sheep with control-releasing urea diet is better than those of contain urea diet and without urea diet,that's show control-releasing urea diet is well about adding CP diet for Tibetan sheep and it is safe and high efficient CP nutrition diet.