Effects of Fermented Soybean Meal on the Production Performance,Antioxidant Capacity and Gut Microbiota Diversity of Laying Hens in the Late Laying Period
[Objective]The effect of replacing soybean meal in the basic diet with 5％fermented soybean meal on the production performance,antioxidant capacity,intestinal tissue morphology and intestinal flora diversity of laying hens in the late laying period was studied.[Method]330-day-old Nongda No.3 laying hens were selected,with 9 000 in control group and 6 800 in experimental group.The hens in control group were fed basal diet,and in experimental group were fed experimental diet in which 5％fermented soybean meal was substituted for the soybean meal in the basal diet.The experimental period was 42 days.During the period,the number of eggs laid and abnormal eggs,the number of dead and culled chickens,and the feed intake were recorded.On the 21st and 42nd days of the experiment,the egg quality of 100 eggs was randomly measured,and the serum biochemical,immune and antioxidant indicators of 12 chickens were tested in each group.On the 42nd day of the experiment,12 laying hens were randomly slaughtered in each group,and duodenum and jejunum segments were collected for analysis of intestinal tissue morphological changes,and cecal contents were collected for determining intestinal microbiota diversity.[Result]Compared with control group,on the 21st day,the feed-to-egg ratio was significantly increased(P＜0.05),the egg yolk color became significantly lighter(P＜0.05),and the serum AST activity was significantly increased(P＜0.05),while the other indicators for investigation had no significant difference(P＞0.05)of hens in experimental group.Compared with control group,on the 42nd day,the feed-to-egg ratio,egg yolk color and serum AST activity were not significantly different(P＞0.05),while the abnormal egg rate and egg production rate were significantly reduced(P＜0.05),eggshell strength,egg weight and protein height were significantly increased(P＜0.05),serum total antioxidant capacity(T-AOC)was significantly increased(P＜0.05),the relative abundance of the genus Cryptobacteroides in the gut microbiota of laying hens in experimental group was significantly reduced(P＜0.05).[Conclusion]Replacing 5％of the soybean meal in the basal diet with fermented soybean meal could significantly improve the production performance and egg quality of laying hens in the late laying period,enhance the antioxidant capacity,and have a certain impact on the gut microbiota structure of the laying hens.
fermented soybean meallaying hens in the late laying periodproduction performanceantioxidant capacitygut microbiota
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