Effects of dietary concentrate level on ruminal fermentation and microbial growth efficiency in dual flow continuous culture

摘要：

A dual-flow continuous culture system was used to study the effect of dietary concentrate levels (0, 20, 40, 60, 80, 100％) on rumen fermentation characteristics and microbial growth efficiency. Dilution rates of solid and liquor fractions were set at 0.04/h and 0.08/h, respectively. The results showed that increasing concentrate level resulted in increased digestibilities of DM and OM, but in decreased digestibilities of NDF and ADF. Also, as the concentrate level increased, there was a decrease in ruminal pH, ammonia concentration and an increased total VFA production. Increasing dietary concentrate level, the molar proportion of propionate linearly increased, but that of acetate decreased. As dietary concentrate level increased, daily microbial N production (DMNP) and microbial growth efficiency (MOEFF) increased. The maximum DMNP and MOEFF were achieved at 80％ dietary concentrate level.

关键词： continuous culture rumen microbial growth efficiency concentrate level

作者: L.Lu Z.G.Xia M.Lin X.X.Wang Q.X.Meng

作者单位: Department of Animal Science, Beijing University of Agriculture Beijing 102206, P.R.China Department of Certification, China Green Food Development Centre Beijing 100081, P.R.China;College o College of Animal Science & Technology, China Agricultural University Beijing 100094, P.R.China

会议类型: 国际会议

会议名称: The 7tb International Symposium on the Nutrition of Herbivores(ISNH-7)(第七届国际草食动物营养研讨会)

会议地点: 北京

会议语种:英文

页码: 701-706

在线出版日期: 2007-09-16（万方平台首次上网日期，不代表论文的发表时间）