动物营养学报Issue(2)：436-443,8.DOI:10.3969/j.issn.1006-267x.2016.02.017
直接法与替代法测定羊草对肉用绵羊代谢能的比较研究
A Comparison on Metabolizable Energy of Leymus chinensis in Mutton Sheep Determined by Direct and Substitution Methods
摘要
Abstract
This study aimed to compare metabolizable energy ( ME) of Leymus chinensis in mutton sheep de-termined by direct and substitution methods.Thirty crossbreed rams weighted about 45.0 kg were used and di-vided into 5 treatments with 6 replicates per treatment and 1 sheep per replicate according to a randomized block design.The diets in different treatments were as follows: full Leymus chinensis diet for direct method, and a basal diet ( forage∶concentrate ratio was 1∶1) and three experimental diets ( the basal diet was replaced by Ley-mus chinensis at 60%, 40%and 20%) for substitution method.Diets were fed twice at 08:00 and 18:00 ( 600 g at each time point) .Each experiment period lasted for 19 d including 10 d of pretest period and 9 d of test period.The results showed as follows:the apparent digestibility of dry matter, organic matter, gross ener-gy and crude protein of showed that basal diet group>20%group>40%group>60%group>full Leymus chinen-sis diet group, and significant differences were found among groups ( P<0.05) .The digestible energy ( DE) and ME showed that basal diet group>20%group>40%group>60%group>full Leymus chinensis diet group, and significant differences were found among groups ( P<0.05) .DM ∶ME had no significant difference a-mong treatments ( P>0.05 ) .The apparent digestibility of crude protein and neutral detergent fiber had no difference between direct and substitutions methods.The apparent digestibility of dry matter, organic matter, and gross energy of Leymus chinensis in full Leymus chinensis diet group measured with direct method was sig-nificantly higher than those in 40%group ( P<0.05) , but had no significant difference with 20%group and 40%group ( P>0.05) .The DE and ME in full Leymus chinensis diet group were significantly higher than those in 60%group ( P<0.05) , and had no significant difference with 40%group and 20%group ( P>0.05) .In de-termination of ME of Leymus chinensis using direct and substitution methods, a significant difference is ob-served when the substitution proportion is different.The optimal substitution proportion is 20%when using sub-stitution method to measure ME.关键词
直接法/替代法/代谢能估测/肉用绵羊/羊草Key words
direct method/substitution method/metabolizable energy estimation/mutton sheep/Leymus chinensis分类
农业科技引用本文复制引用
赵明明,杨开伦,邓凯东,赵江波,肖怡,马涛,刁其玉..直接法与替代法测定羊草对肉用绵羊代谢能的比较研究[J].动物营养学报,2016,(2):436-443,8.基金项目
秸秆饲料生物转化技术研究与示范（20120304202）；国家肉羊产业技术体系 （）
