Effects of Fermented Sugarcane Bagasse on Growth Performance,Nutrient Apparent Digestibility,Rumen Fermentation Characteristics and Rumen Microflora of Beef Cattle
The experiment was conducted to explore the effects of replacing sugarcane bagasse with fermented sugarcane bagasse on growth performance,nutrient apparent digestibility,rumen fermentation characteristics and rumen microflora of beef cattle.A total of 14 healthy Simmental crossbred cattle with similar body weight of(363.84±9.11)kg were randomly divided into two groups with 7 replicates per group and 1 cattle per repli-cate.Beef cattle in control group(CON group)was fed a basal diet containing 20％sugarcane bagasse,and those in fermented sugarcane bagasse group(FSB group)was fed a diet with 20％fermented sugarcane ba-gasse replacing sugarcane bagasse.Test period was 87 d,the preliminary trial period was 7 d,and the experi-ment lasted for 80 days.The results showed as follows:there was no significant difference in final body weight and dry matter intake between the two groups(P＞0.05),but the average daily gain(ADG)of cattle in the FSB group was significantly higher than that in the CON group(P＜0.05),and ratio of feed to gain was signif-icantly lower than that in the CON group(P＜0.05).The apparent digestibility of dry matter,organic matter,crude protein and neutral detergent fiber in the FSB group was significantly higher than that in the CON group(P＜0.05).The contents of ammonia nitrogen,microbial protein,propionic acid,isobutyric acid,butyric acid and total volatile fatty acid in the rumen of cattle in the FSB group were significantly higher than those in the CON group(P＜0.05).The relative abundance of the Rikenellaceae_RC9_gut_group and Prevotellaceae_UCG-003 in the FSB group was significantly lower than that in the CON group(P＜0.05),but the relative abun-dance of Succiniclasticum in the FSB group was significantly higher than that in the CON group(P＜0.05).Tax4Fun gene function prediction showed that the relative abundance of amino acid metabolism,nucleotide metabolism,and exogenous biodegradation and metabolic pathways in the FSB group was significantly higher than that in the CON group(P＜0.05).In conclusion,adding 20％fermented sugarcane bagasse which is fer-mented by bacteria and enzyme can change the rumen microflora structure,and can improve the growth per-formance of beef cattle by increasing the contents of the rumen volatile fatty acid and microbial protein and the apparent digestibility of nutrients.[Chinese Journal of Animal Nutrition,2024,36(3):1685-1697]
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