Effects of Dietary Fermented Brewer's Grains Level on Growth Performance,Digestion and Metabolism,Serum Biochemical Indices and Rumen Fermentation of Mindong Goats
The aim of this experiment was to study the effects of dietary fermented brewer's grains level on growth performance,digestion and metabolism,serum biochemical indices and rumen fermentation of Mindong goats,and to provide reference for the scientific utilization of fermented brewer's grains in farmed Mindong goats.Twenty-four healthy 8-month-old Mindong goats with similar body weight[(20.89±1.21)kg]were randomly divided into 4 groups with 6 replicates per group and 1 goat per replicate.The dietary fermented brewer's grains levels of control group,experiment group Ⅰ,experiment group Ⅱ and experiment group Ⅲwere 0,12％,24％and 36％,respectively,and the dietary nutrient levels of each group were consistent.The pre-experimental period lasted for 10 days,and the experimental period lasted for 7 days.The results showed as follows:1)the dry matter intake of experiment group Ⅰ and experiment group Ⅱ was significantly higher than that of the control group(P＜0.05).The gross energy apparent digestibility of control group and experiment group Ⅰ was significantly higher than that of experiment group Ⅱ and experiment group Ⅲ(P＜0.05).The acid detergent fiber apparent digestibility of experiment group Ⅱ and experiment group Ⅲ was significantly higher than that of control group and experiment group Ⅰ(P＜0.05).The nitrogen intake of the control group was significantly lower than that of experiment group Ⅰ,experiment group Ⅱ and experiment group Ⅲ(P＜0.05).2)The serum total protein content of experiment group Ⅱ and experiment group Ⅲ was significantly higher than that of control group and experiment group Ⅰ(P＜0.05).3)The rumen pH of experiment groupⅡ and experiment group Ⅲ was significantly higher than that of control group and experiment group Ⅰ(P＜0.05),and the rumen butyrate content of experiment group Ⅰ,experiment group Ⅱ and experiment group Ⅲwas significantly lower than that of the control group(P＜0.05).4)At the phylum level,the rumen Firmicutes relative abundance of experiment group Ⅱ was significantly higher than that of control group and experiment group Ⅰ(P＜0.05),and the rumen Bacteroidetes relative abundance of experiment group Ⅲ was significantly higher than that of experiment group Ⅰ and experiment group Ⅱ(P＜0.05).At the genus level,the rumen Prevotella relative abundance of experiment group Ⅲ was significantly higher than that of experiment group Ⅰand experiment group Ⅱ(P＜0.05),the rumen Succiniclasticum relative abundance of experiment group Ⅲwas significantly higher than that of control group,experiment group Ⅰ and experiment group Ⅱ(P＜0.05),and the rumen Succiniaclasticum relative abundance of experiment group Ⅰ and experiment group Ⅱ was sig-nificantly higher than that of control group(P＜0.05).In conclusion,the addition of fermented brewer's grains in the diet can increase the dry matter intake and ADF apparent digestibility of Mindong goats,enhance the relative abundance of rumen cellulose degrading microorganisms to a certain extent,improve the rumen fer-mentation environment,and have no negative effect on the growth and body metabolism of Mindong goats.From the results of this experiment,the best feeding effect is achieved when the dietary fermented brewer's grains level is 12％ to 24％.[Chinese Journal of Animal Nutrition,2024,36(1):416-427]
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