Effect of polyurethane coated urea on ruminal ammonia release and fermentation characteristics in vitro of steam-flaked maize-based diet
Feed-grade urea (FGU), soyabean meal (SBM) and polyurethane coated urea (PCU) were used to investigate the effect of different nitrogen sources on ruminal ammonia release and other fermentation characteristics in vitro. The results showed NH3-N concentrations of PCU and SBM diets were similar during first 8 h of fermentation and were significantly lower by 8.2-20.6％ than that of FGU diet (P＜0.01). In vitro ruminal pH, 24-h gas production, total VFA and individual VFA molar proportions were not affected by nitrogen sources, except for 24-h ruminal dry matter digestibility in vitro that was higher (P＜0.05) for SBM diet than FGU and PCU diets. It was concluded that PCU supplement could slower ruminal ammonia release, which was similar with SBM and better than FGU.
nitrogen sources ruminal ammonia release fermentation characteristics in vitro
H.S.Xin L.P.Ren Z.M.Zhou C.M.Sun Q.P.Liu Q.X.Meng
State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology, China Agricultural University Beijing 100094, P.R.China
国际会议
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)
北京
英文
707-711
2007-09-16（万方平台首次上网日期，不代表论文的发表时间）