皇竹草和喷浆玉米皮混合对瘤胃发酵特性的影响

Effect of the combination of Pennisetum sinese and sprouting corn bran on rumen fermentation characteristics

为了解皇竹草(Pennisetum sinese)和喷浆玉米皮(Spouting corn bran)的组合利用效果,通过体外产气法探讨了皇竹草和喷浆玉米皮按100∶0、75∶25、50∶50、25∶75、0∶100比例混合后发酵24和48h的有机物质、纤维物质降解率和挥发性脂肪酸浓度及其混合效应的变化情况,从而为喷浆玉米皮在山羊养殖中的应用提供理论基础和依据。试验结果表明,在发酵48h时随着喷浆玉米皮比例的增加,有机物降解率呈极显著增加趋势(P<0.01);0∶100组合时中性洗涤纤维降解率显著最高(P<0.05);48h时混合组的酸性洗涤纤维降解率均显著高于单一原料组(P<0.05);发酵24h时,随着喷浆玉米皮的比例增加,乙酸、丙酸和丁酸浓度均呈增加趋势;48h时,均以25∶75混合的乙酸、丙酸和丁酸浓度最高。有机物质(OM)、中性洗涤纤维(NDF)和粗纤维(CF)按75∶25和50∶50比例混合时在两个时间段均为正混合效应,25∶75混合有负混合效应出现;丙酸和丁酸以50∶50混合时混合效应在两个时间段均为最大,乙酸在发酵24h时,最佳混合效应的混合比例是75∶25。综上所述,皇竹草和喷浆玉米皮在75∶25和50∶50混合时产生最佳混合效果。

In order to understand the combined effect of Pennisetum sinese and sprouting corn bran,combinations of P.sinese and sprouting corn bran were mixed in the proportions of 100∶0,75∶25,50∶50,25∶75,and 0∶100,respectively,and rumen fermentation in vitro was adopted to evaluate combination effects by analyzing total volatile fatty acids concentration,organic matter degradation rate,neutral detergent degradation rate,and acid detergent degradation rate after 24 hand 48 h.At 48 h,the degradation rate of organic matter increased significantly with increasing sprouting corn bran ratio（P〈0.01）.With the 0∶100 combination,the neutral detergent degradation rate was the highest and showed a significant difference（P〈0.05）.At 48 h,the degradation rate of acid detergent fibers in the combination group was significant higher than that in the single feed group（P〈0.05）.At 24 h,as the proportion of sprouting corn bran increased,acetic acid,propionic acid,and butyric acid concentrations tended to increase.At 48 h,with the combination of 25∶75,acetic acid,propionic acid,and butyric acid concentrations were the highest.Organic materials,neutral detergent fibers,and crude fibers were combined at a ratio of 75∶25 and 50∶50 to have a positive combined effect at 24 hand 48 h.The 25∶75 combination exhibited a negative combined effect.The combined effect of propionic acid and butyric acid with the 50∶50 combination was highest at 24 hand 48 h.The best combined effect of acetic acid at 24 h was seen with 75∶25 combination.In summary,combinations of P.sinese and sprouting corn bran in the range of（75∶25）-（50∶50）produced the best results.