畜牧与兽医2013，Vol.45Issue(4)：5-10,6.
不同精粗比日粮对奶山羊瘤胃液pH值、VFA及血液VFA含量的影响
Effects of different dietary concentrate to forage ratios on rumen fluid pH and VFA levels and blood VFA levels in dairy goats
摘要
Abstract
The aim of this study was to evaluate the effect of dietary concentrate to forage ratios on rumen fluid pH and VFA levels and blood VFA levels in dairy goats. Eight dairy goats with permanent rumen fistula were randomly divided into two groups in a randomly block design. Animals were fed two kinds of diets with different concentrate to forage ratios, which were 6 : 4 ( concentrate : roughage = 6:4, HC) and 4 : 6 (concentrate : roughage = 4 : 6, HR). The experimental period included 15 days adaptation and 3 days samples collection. The results showed that HC diets decreased pH value of rumen fluids compared with HR diets (P<0. 05) , the pH value decreased to minimum at 3 h post-feeding and the pH value were 5. 71 and 6. 08, respectively. Except acetic acid, the concentration of propionate, isobu-tyrate, butyrate, isovalerate, valerate and TVFA of rumen fluids in HC were higher than those in HR and increased 4.99% , 5.58% , 21. 81% , 17. 95% , 18. 27% , and 1. 66% , respectively. All of plasma VFAs levels in HC group were higher than that in HR group, especially, the concentration of propionate and butyrate reached significant levels (P<0. 05). The ratio of acetate to propionate of rumen fluid and plasma in goats fed HC diets were both low compared with HR diets, but the difference was not significant (P>0. 05 ). The maximum concentrations of acetate, propionate and TVFA in HC and HR diet were showed at 2 h and 3 h post-feeding, respectively. The maximum plasma concentration of VFA were observed at 2 h post-feeding, and then reduced to before feeding levels gradually in both two diets. It was concluded that the pH value of rumen fluid were decreased significantly and the rumen and plasma concentrations of VFA was increased in goats fed HC diets. The production rate of VFA of rumen fluids in goats fed HC diets was high compared with HR diets.关键词
精粗比/奶山羊/pH值/挥发性脂肪酸Key words
concentrate to forage ratio/ dairy goat/ pH value/ VFA分类
农业科技引用本文复制引用
张腾,庄苏,董文超,常广军,颜瑞,王恬..不同精粗比日粮对奶山羊瘤胃液pH值、VFA及血液VFA含量的影响[J].畜牧与兽医,2013,45(4):5-10,6.基金项目
国家"973"计划项目(2011CB100802). （2011CB100802）
