5种饲草的分级指数测定与评价  

Measurement and evaluation of grading indexes(GI) of five forages

作　　者：成立新 杨瑞杰[2] 格根图[2] 孙林[2] 付俊平[2] 贾玉山[2] 

机构地区：[1]内蒙古自治区农牧业科学院,内蒙古呼和浩特010031 [2]内蒙古农业大学生态环境学院,内蒙古呼和浩特010019

出　　处：《草业科学》2013年第8期1284-1288,共5页Pratacultural Science

基　　金：国家牧草产业技术体系(CARS-35)

摘　　要：本研究通过测定"草原2号"杂花苜蓿(Medicago varia cv.caoyuan No.2)、沙打旺(Astragalus adsurgens)、黑麦草(Lolium perenne)、高丹草(Sorghum vulgare×S.sudanese)和狼尾草(Pennisetum alopecuroides)5种饲草的常规营养成分、体外消化率、总能值及自由采食量等指标,以中性洗涤纤维(NDF)、酸性洗涤纤维(ADF)和酸性洗涤木质素(ADL)为不同纤维素指标计算得出5种饲草的分级指数(Grading Index,GI)。经对比分析后认为,以ADL为纤维素指标计算得出的饲草分级指数最符合实际饲养中的饲草价值。按此指数评价的5种饲草品质优劣顺序为苜蓿>沙打旺>黑麦草>高丹草>狼尾草。The study was made by calculating the Grading Index （GI） of five kinds of forage grasses with their neutral washing fiber （NDF）, acid washing fiber （ADF） and acid washing lignin （ADL） as different cellulose index to determine the conventional nutrient components , the in vitro digestion rate, gross ener- gy, and dry matter intake. Comparing and analyzing GI calculation, the results showed that the grading index calculated by ADL as cellulose index was more reasonable, and also conformed to the actual feeding conditions. And the preferential order was alfalfa 〉 erect milkvetch〉ryegrass〉sorghum Hybrid sudan grass〉Chinese pennisetum.

关 键 词：分级指数(GI) 饲草品质 代谢能 干物质自由采食量 

分 类 号：S816[农业科学—饲料科学]