瘤胃能氮同步释放对奶牛微生物蛋白合成和瘤胃发酵的影响  

Effect of Synchronizing the Rate of Dietary Energy and Nitrogen Release in Diets on Microbial Protein Synthesis and Rumen Fermentation in Dairy Cows

作　　者：张俊瑜[1] 臧长江[2] 王文奇[1] 郭同军[1] 王世昌[1] 桑断疾[1] 

机构地区：[1]新疆畜牧科学院饲料研究所,乌鲁木齐830000 [2]新疆农业大学动物科学学院,乌鲁木齐830052

出　　处：《中国畜牧兽医》2015年第2期375-381,共7页China Animal Husbandry & Veterinary Medicine

基　　金：新疆维吾尔自治区公益性科研院所基本科研业务经费(KY2013017);公益性行业(农业)科研专项经费(201303062)

摘　　要：本研究通过体外产气试验,研究瘤胃能氮同步释放对微生物蛋白合成和瘤胃发酵的影响。试验选用4头健康、泌乳中期的荷斯坦奶牛作为瘤胃液供体动物,采用单因子试验设计,设置3种不同能氮同步化指数的等能、等氮日粮(日粮A,SI=0.74;日粮B,SI=0.83;日粮C,SI=0.91)。结果表明,随着日粮SI值增加,微生物蛋白合成量显著增加(P<0.05)、氨氮浓度在8和12h极显著下降(P<0.01);A组与B组相比,在8h时,产气量、pH达到了显著或极显著差异(P<0.05;P<0.01),12h时,挥发性脂肪酸含量达到了极显著差异(P<0.01)。结果显示,日粮能氮同步释放可显著影响瘤胃微生物蛋白的合成量和氨氮浓度。The objective of this experiment was to study the effect of synchronizing the rate of di- etary energy and nitrogen release in diets on microbial protein synthesis and rumen fermentation in dairy cows using in vitro gas production method. Four healthy Holstein cows in mid-lactation were used to offer rumen juice. A single factor experimental design and three isoenergetic and iso- nitrogenous diets varying in synchronization index （SI） were used in this study （diet A, SI = 0.74 ; diet B, SI = 0.83 ; diet C, SI = 0.91）. The results showed that microbial protein production was significantly increased （P〈0. 05） ,and NH3-N concentrtatin was extremely significantly de- creased in 8 and 12 h as synchrony level of diets increased （P〈0.01）. In 8 h,group A compared with group B,gas production, p H cached significant or extremely significant difference （P〈0.05; P〈0.01） ,in 12 h,group A compared with group B,the volatile fatty acid content was extremely significant difference （P〈0.01）. The results indicated that synchronization of dietary energy and nitrogen release had significant influence on microbial protein synthesis and NH3-N concentration for dairy cows.

关 键 词：能氮同步化指数 微生物蛋白 瘤胃发酵 奶牛 

分 类 号：S823.91[农业科学—畜牧学]