添加非蛋白氮对水牛瘤胃微生物蛋白合成的影响

Effects of Added Nonprotein Nitrogen on Microbial Protein Synthesis in Rumen of Buffalo

使用３头装有永久性瘤胃瘘管和临时性颈静脉血管瘘管的中国海仔母水牛，于冬季试验，分为稻草期（Ⅰ期）和稻草添加羟甲基尿素期（Ⅱ期）。结果表明：随着冬季室温的不断下降，Ⅱ期与Ⅰ期相比，瘤胃液ｐＨ水平显著下降，瘤胃液体积显著减小，但周转率、停留时间差异均不显著，瘤胃液ＮＨ３－Ｎ浓度、池量及血清尿素氮浓度显著增高，瘤胃液ＭＣＰ总量、纤毛虫、细菌蛋白浓度和池量均显著减少。

Three Chinese Haizi female buffaloes,each with permanent rumen cannuae and temporary jugular vein fistulae,were used in this winter experiment,which were divided into rice straw period (the first period) and rice straw added with formaldehyed treated urea period (the second period).The results showed that with dropping room temperature in winter,comparing with the first period,the second period showed significant decreases in the pH level of rumen liquor and in rumen fluid volume,whereas no significant changes in turnover rate and retention time,and significant increases in NH 3 N concentration and pool quantity in rumen liquor and in serum urea nitrogen concentration,and significant decrease in rumen liquor MCP total,prozoa,bacteris protein concentration,and pool quantity as well.