稻草补饲苜蓿对山羊瘤胃发酵的组合效应  

Associative effects of rice straw supplemented with different level of alfalfa hay on rumen fermentation of goats

作　　者：张吉鹍[1,2] 李龙瑞 吴文旋[3] 邹庆华[1,2] 

机构地区：[1]江西省农业科学院畜牧兽医研究所,江西南昌330200 [2]江西新天地药业有限公司兽药研究院,江西峡江331400 [3]贵州大学动物科学学院,贵州贵阳550025

出　　处：《草业科学》2014年第2期313-320,共8页Pratacultural Science

基　　金：国家自然科学基金(31060313;31160468);贵州省农业科技攻关项目(黔科合NY字(2009)3085)

摘　　要：将9只体况良好、体质量相近（41.3±1.2） kg、安装有永久性瘤胃瘘管的成都麻羊半同胞羯羊, 随机分成3组, 饲以稻草基础日粮, 分别补饲苜蓿（Medicago sativa, MSL）25%（MSL25）、50%（MSL50）与75%（MSL75）, 进行瘤胃内环境的测定及发酵指标的组合效应研究。结果显示, 3组不同苜蓿补饲水平混合粗饲料的瘤胃液相pH在6.53～6.93, NH3-N浓度在9.42～43.27 mg·dL^-1, 总挥发性脂肪酸浓度在69.45～107.28 mmol·L^-1, 菌体蛋白浓度在73.56～132.23 mg·dL^-1, NH3-N浓度、总挥发性脂肪酸浓度与菌体蛋白浓度均随苜蓿补饲水平的增加呈非线性增加。以MSL25作参照的瘤胃发酵指标的多项指标组合效应指数（MFAEI）, MSL75的为1.21, 仅为MSL50组1.03的1.17倍。表明当山羊稻草基础日粮苜蓿补饲水平超过50%时, 提高稻草纤维物质利用率的组合效应增加不明显。In order to determinate the associative effects of different diet on rumen fermentation, 9 healthy and half sib Chengdu Ma goats with similar weighs （41.3±1.2） kg and fitted with permanent ruminal cannulas were randomly divided into three groups and fed with the different diets which was rice straw （RS） supplemented with 25%（MSL25）, 50%（MSL50） and 75%（MSL75） alfalfa hay （Medicago sativa, MSL）, respectively. pH of these three mixed forages fluctuated between 6.53 and 6.93. The concentration of NH3-N, total volatile fatty acids（VFAs）, rumen microbial protein （MCP） were 73.56～132.23 mg·dL^-1, 9.42～43.27 mg·dL^-1 and 69.45～107.28 mmol·L^-1, respectively, which nonlinearly increased with increasing levels of MSL. Compared with MSL25, the multiple-factors associative effects index （MFAEI） of MSL75 and MSL50 were 1.21 and 1.03, respectively, which indicated that 50% was the optimal proportion of alfalfa hay supplemented to the rice straw in this trail. There was no significant improvement on fiber usage when MSL supplementary proportion was over 50%.

关 键 词：山羊 稻草 苜蓿 瘤胃内环境 多项指标组合效应指数 

分 类 号：S827.5[农业科学—畜牧学]