Effects of different proportions of dietary structural and nonstructural carbohydrates on ruminal fermentation and microbial growth efficiency in sheep
Four sheep were used in a 4×4 Latin square design to study the effect of different dietary proportions of structural carbohydrate (SC) and nonstructural carbohydrate (NSC) (SC:NSC ratio: 0.55, 1.12, 2.25 and 5.24) on rumen fermentation and microbial growth efficiency. As the dietary SC: NSC ratio increased, ruminal pH and ammonia concentration increased (P＜0.001), but total rumen VFA concentration decreased (P＜0.001). When dietary SC:NSC ratio increased from 0.55 to 1.12, the molar percentage of acetate increased (P＜0.001) and the molar proportion of propionate decreased (P＜0.001). However, when the ratio increased from 1.12 to 5.24, there were no changed molar percentages of acetate and of propionate. Both daily microbial nitrogen production and microbial efficiency decreased with increasing dietary SC:NSC ratio.
sheep SC :NSC rumen fermentation microbial growth efficiency
Z.G.Xia Q.X.Meng
China Green Food Development Center Beijing 100081, PR.China State Key Laboratory of Animal Nutrition, College of Animal Sciences and Technology,China Agricultur
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
718-723
2007-09-16（万方平台首次上网日期，不代表论文的发表时间）