Abstract:

In order to study the effects of different combinations of bacteriocin and probiotics on growth performance,slaughter performance,intestinal tissue morphology and intestinal flora of broilers.A total of 300 one-day-old male chicks of Aibayijia(AA)were selected and randomly divided into 5 groups,with 6 replicates in each group,10 in each replicate,and group A(control group)was fed the basal diet,group B(bacteriocin 50+probiotics 50)added bacteriocin 2.57 mL/kg and probiotics 0.84 g/kg to the basal diet,and group C(bacteriocin 100+probiotics 100)added bacteria to the basal diet bacteriocin 5.13 mL/kg,probiotics 1.68 g/kg,group D(bacteriocin 150+probiotics 150)added bacteriocin 7.7 mL/kg,probiotics 2.52 g/kg in the basal diet,group E(antibiotics 50)chloromycin 50 mg/kg was added to the basal diet.The test was divided into the first stage(1—21 days old)and the second stage(21—42 days old),and the test period was 42 days.The results showed that,at 22—42 days and 1-42 days,the average daily gain in group D was significantly higher than that in group A(P<0.05),and the feed-to-weight ratio was significantly lower(P<0.05).The heart weight of group D was significantly higher than that of group A(P<0.05),and the weight of liver of group C was significantly higher than that of group A(P<0.05).Compared with group A,the duodenal villus height in groups C,D,and E were significantly increased(P<0.05).Compared with group A,the relative abundance of Firmicutes in group D increased,while the relative abundance of Bacteroidetes decreased,the relative abundance of Proteobacteria in groups C, D, and E was higher than that in group B. At the genus level,the relative abundance of Ruminococcus in group D was significantly higher than that in other groups(P<0.05).The addition of bacteriocin in the diet improves the overall performance of white feather broilers,improves the structure of intestinal flora of broilers,promotes healthy intestinal development,and increases the weight of heart and liver in broilers.The supplemental level of group D(bacteriocin 150+ probiotics 150)was appropriate.

Key words: White feather broiler, Bacteriocin, Probiotics, Growth performance, Slaughter performance, Intestinal morphology, Intestinal flora