Effect of Caragana korshinskii Silage on Rumen Fermentation Performance of Dairy Cows
[Objective]The purpose of this study was to improve the digestibility and utilization of Caragana korshinskii(CK)in the form of silage,and explore the effect of CK silage on the rumen dry matter degradation rate and fermentation performance of dairy cows,so as to provide a potential feed resource for ruminants.[Method]The fresh CK was randomly divided into fresh sample and silage groups,with 9 replicates in each group,and each replicate contained 1 000 g matters.The silage quality and nutrient composition of CK were determined after 30 days ensilaging process,following by the weighing of 18 samples at 10 g/part to determine the degradation rate of nylon bag dry matter(DM)in the rumen fermentation of dairy cows for 2,4,8,24,48 and 72 h,respectively.Further,18 samples were weighed at 0.5 g/part to determine the ruminal fermentation parameters of in vitro for 2,4,8,24,48 and 72 h,respectively.[Result]The contents of DM,crude protein(CP),neutral detergent fiber(NDF)and acid detergent fiber(ADF)of CK in silage group were significantly lower than those in fresh group(P＜0.05).After 30 days of ensilaging,pH of CK reached to 4.51,the ammonia nitrogen content was 5.12 g/kg,the lactic acid content was 14.53 mmol/g,and the acetic acid content was 8.45 g/kg.The nylon bag DM degradation rate of CK in fresh group was significantly lower than that in silage group at 2,4,8,24 and 48 h of rumen fermentation(P＜0.05).The results of rumen in vitro fermentation parameters showed that the DM degradation rate,gas production,and the contents of acetic acid,propionic acid and total volatile acid of CK in silage group were significantly higher than those in fresh group(P＜0.05).The contents of ammonia nitrogen and methane in silage group were significantly higher than those in fresh group at 24,48 and 72 h of in vitro fermentation(P＜0.05).[Conclusion]In this study,ensilaging process of CK could effectively reduce the crude fiber content of CK,and improve the rumen DM degradation rate,in vitro gas production,and the contents of volatile fatty acid and ammonia nitrogen of CK.
Caragana korshinskiisilagein vitro gas productiondry matter degradation raterumen fermentation parameters
万方数据
维普
