Effects of Enterococcus faecium F11.1G on Growth Performance,Nutrient Apparent Digestibility,Slaughter Performance,Rumen Fermentation and Rumen Microflora of Weaned Lambs
This experiment aimed to investigate the effects of adding Enterococcus Faecium F11.1G to the diet on the growth performance,apparent nutrient digestibility,slaughter performance,and rumen fermentation and rumen microflora of Karakul weaned lambs.Twenty healthy Karakul weaned lambs,2 months old,with a body weight of(21.0±1.0)kg,were selected for the experiment.They were divided into a control group and an experimental group,with 10 lambs in each group.The control group was fed a basic diet,while the experi-mental group was fed the basic diet with 2.0 g per day per lamb of Enterococcus faecium F11.1G.The experi-ment lasted for 75 days,including a 15-day pre-trial period and a 60-day formal trial period.The initial body weight was recorded before morning feeding on the day 1 of the trial period,during days 45 to 52 of the formal trial period,the apparent digestibility of nutrients were determined.On the day 60 of the formal trial period,5 animals from each group were selected for fasting weighing and slaughter to measure slaughter performance,rumen fermentation parameters,and rumen microbial flora.The results showed that the experimental group's net weight gain and average daily gain(ADG)were significantly higher than those of the control group(P＜0.01).The average daily feed intake(ADFI)was significantly higher than that of the control group(P＜0.05),and the feed/gain(F/G)was significantly lower than that of the control group(P＜0.01).The appar-ent digestibility of acid detergent fiber(ADF)in the experimental group was significantly higher than that in the control group(P＜0.05).The live weight and carcass weight of the experimental group before slaughter were significantly higher than those of the control group(P＜0.05).The liver index,rumen index,small intes-tine index,and large intestine index were significantly higher than those of the control group(P＜0.05 or P＜0.01),while the reticulum index was significantly lower than that of the control group(P＜0.05).In terms of rumen fermentation indicators,the addition of Enterococcus faecium F11.1G significantly increased the concen-tration of acetate,butyrate,and the acetate/propionate in the rumen(P＜0.05).In terms of rumen microbial flora,adding Enterococcus faecium F11.1G probiotics increased the number of rumen microbial OTUs and the relative abundance of Bacteroidetes,Firmicutes and Fibrobacteres,Rikenellaceae_RC9_gut_group was posi-tively correlated with ADG,pH,the concentrations of ammonia nitrogen(NH3-N),acetate,butyrate,and acetate/propionate.In conclusion,adding 2.0 g of Enterococcus faecium F11.1G to the diet can improve the growth performance and ADF apparent digestibility of weaned lambs,improve rumen fermentation by increas-ing the concentration of acetate and butyrate in the rumen,increase the number of OTUs of rumen bacteria,and increase the abundance of Bacteroidota,Firmicutes,Fibrobacterota at the phylum level of rumen bacteria.The relative abundance of Rikenellaceae_RC9_gut_group is positively correlated with ADG and rumen fermen-tation parameters.[Chinese Journal of Animal Nutrition,2024,36(5):3143-3155]
万方数据
维普
