To Evaluate Feeding Value of a Mixed Silage of Reed Straw and Defective Pear Silage Replacing Whole Corn Silage by in Vitro Method
The aim of this experiment was to investigate the effects of replacing whole corn silage with a mix-ture of reed straw and defective pear silage on the dynamics of in vitro rumen fermentation parameters,nutrient degradation rates and microbial composition.In vitro fermentation was carried out by replacing 0(T0 group,control group),10％(T1 group),30％(T3 group)and 50％(T5 group)of whole corn silage for 72 h.The cumulative gas production,fermentation parameters,microbial composition and nutrient degradation rate after fermentation were measured at different time points,and evaluated by multi-indicator composite index(MFAEI).The results showed as follows:with the extension of fermentation time,the gas production and contents of ammonia nitrogen(NH3-N),total volatile fatty acids,acetic acid,propionic acid and butyric acid were significantly increased(P＜0.05).At 48 and 72 h,gas production in control group was significantly high-er than that in T3 and T5 groups(P＜0.05).There were no significant differences in pH and NH3-N content a-mong all groups(P＞0.05).There was no significant difference in total volatile fatty acid content among differ-ent groups at different time points(P＞0.05).at 12 and 24 h,the acetic acid content in T5 group was signifi-cantly higher than that in T1 group(P＜0.05);at 3 and 48 h,the propionic acid content in T1 group was sig-nificantly higher than that in T5 group(P＜0.05);at 24 h,butyric acid content in control group was signifi-cantly higher than that in T5 group(P＜0.05);the dry matter degradation rate,neutral detergent fiber degrada-tion rate and acid detergent fiber degradation rate in control group were significantly higher than those in T5 group(P＜0.05).MFAEI in T1 group was significantly higher than that in T3 group and T5 group(P＜0.05).According to the experimental results,it is recommended to use mixed silage of reed straw and defective pear silage to replace 10％whole corn silage in sheep diet under this experimental condition.[Chinese Journal of Animal Nutrition,2024,36(11):7394-7408]
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维普
