大豆油不同添加水平对瘤胃体外发酵和产气的影响

Effects of different soybean oil levels on the rumen fermentation and gas production in vitro

本试验通过体外培养,研究在精粗比为30∶70(偏粗型)日粮类型条件下,不同大豆油添加水平对产气量、甲烷产量、pH值和纤维降解率的影响。结果表明:随着大豆油添加水平的提高,产气量和甲烷产量逐渐降低,且各添加组显著低于对照组;pH值随着培养时间的延长,各添加水平在不同培养时间点与对照组相比均上升,其中添加量为4%和6%与对照组相比差异显著(P<0.05),添加量为8%时,与对照组相比差异极显著(P<0.01);培养24h后,纤维降解率的抑制潜力8%水平最大,与对照组相比差异极显著(P<0.01),其次是6%的添加水平,与对照组相比差异显著(P<0.05),而2%和4%添加水平对纤维降解率的抑制程度与对照组相比差异不显著(P>0.05)。通过产气量、pH值和纤维降解率综合考察大豆油对瘤胃体外发酵和产气的影响,本试验得出大豆油的最适添加量为4%。

The study was conducted to investigate the effects of different levels of soybean oil on gas production,pH value, fiber degradation rate in vitro,based on concentrate to forage ratio 30：70.The results showed that：with the increasing level of soybean oil supplemention,gas production and CH4 production decreased gradually,which lower than that of the control significantly;Compared with the control, the pH value of the experiments increased with incubation time extended, and were higher than that of the control treatment （P 〈 0.05）.4 %,6 % and 8 % soybean oil increased the pH value significantly （P 〈 0.05）compared to the control.After 24 h cuhure,inbibition potential on cellulose degradation rate of 6 % and 8 % supplemention were higher than that of the control （P 〈 0.05）,while there were no difference among the 2 %, 4 % and the control.It is concluded that the suitable soybean oil supplemention is 4 % level through indexs of gas production,pH level and fiber degradation rate.