饲粮结构与非结构性碳水化合物比例对绵羊瘤胃代谢参数的影响  

Effects of Dietary Structural and Nonstructural Carbohydrate Ratio on Ruminal Fermentation for Sheep

作　　者：吴秋珏[1,2] 郝正里[1] 李发弟[1,3] 叶得河[4] 郑琛[1] 张晓庆[1] 李勇[1] 

机构地区：[1]甘肃农业大学动物科学技术学院,兰州730070 [2]河南科技大学动物科学技术学院,洛阳471003 [3]甘肃省饲料工程技术研究中心,兰州730000 [4]甘肃农业大学动物医学院,兰州730070

出　　处：《畜牧兽医学报》2011年第2期196-202,共7页ACTA VETERINARIA ET ZOOTECHNICA SINICA

基　　金：国家农业科技成果转化资金项目(2008GB2G100324);甘肃省农业科技成果转化基金项目(0704XCNA008);现代农业产业技术体系建设专项资金资助

摘　　要：旨在探讨绵羊饲粮结构与非结构性碳水化合物比例（SC/NSC为1.57（Ⅰ）、1.95（Ⅱ）、2.29（Ⅲ））对瘤胃发酵参数（pH、VFA、总氮、NH3-N、尿素氮、蛋白氮）的影响。选用6只约1.5岁,体质量25~30 kg,装有瘤胃瘘管的甘肃高山细毛羊羯羊,按3×3重复拉丁方设计（预试期10 d,正试期9 d）。结果表明：采食饲粮Ⅰ的绵羊瘤胃液pH平均值显著低于采食饲粮Ⅱ（P〈0.01）、Ⅲ（P〈0.05）的绵羊;除处理Ⅰ采食后3 h的pH较低（5.86）外,所有pH测值均在6.2~7.0范围内。瘤胃液TVFA平均值（mmol.L-1）呈现Ⅰ、Ⅱ高于Ⅲ的趋势（P=0.09）;处理间乙、丙及其他酸的摩尔比和乙酸/丙酸比均值无显著差异（P〉0.05）,Ⅰ的丁酸摩尔比均值显著高于Ⅲ（P〈0.05）。瘤胃液总氮和蛋白氮均值随SC/NSC值增高而显著下降（P〈0.01或P〈0.05）;氨氮与尿素氮均值在处理间无显著差异（P〉0.05）。结果显示,饲粮粗料份额高于60%时,随SC/NSC值增高,绵羊瘤胃液pH上升,TVFA、总氮和蛋白氮平均浓度下降,对氨氮与尿素氮浓度则无显著影响。This study was conducted to investigate the effects of ratios of structural to nonstructural carbohydrates（SC/NSC=1.57（Ⅰ）,1.95（Ⅱ）,2.29（Ⅲ））in the three diets on ruminal fermentation parameters（pH,VFA,total nitrogen,NH3-N,Urea-N,protein nitrogen）for sheep.Six Gansu high mountain fine wethers fitted with permanent ruminal cannulae,about one and half year old,and weighing 25-30 kg,were used according to a double 3×3 Latin square design with the three feeding cycles of 19 days each（10 days for adapting and 9 days for sampling）.The results showed that the average of pH in rumen fluid of wethers for treatment Ⅰwere lower significantly than those for treatment Ⅱ（P0.01） and Ⅲ（P0.05） the pH range of all the rumen fluid were from 6.2 to 7.0 except the pH（5.86） of the treatmentⅠ was lower after 3 h of feeding in this trial.There were the tendencies that averages of TVFA concentration in rumen fluid was higher forⅠand Ⅱ than that for treatment Ⅲ（P=0.09） no significant difference on the molar ratio of acetic,propionic and other acid as well as acetic/propionic ratio among the three treatments were observed（P0.05）,the molar ratio of butyric were higher for Ⅰthan that for Ⅲ（P0.05）.As the SC/NSC being increase,the averages of total-and protein nitrogen in rumen fluid were reducing（P0.01or P0.05）;but no significant difference on the levels of NH3-N and Urea-N among the three treatments occur（P0.05）.These results indicated that as the rising of the value of SC/NSC,the pH of rumen fluid were increasing,the averages of TVFA,total-and protein N concentrations were decreasing,but there were no significant influence on the levels of NH3-N and Urea-N under portions of forage in all the three diets being higher more than 60%.

关 键 词：结构性碳水化合物 非结构性碳水化合物 挥发性脂肪酸 瘤胃液 绵羊 

分 类 号：S816.41[农业科学—饲料科学] S826.89[农业科学—畜牧学]