Effects of Lactobacillus acidophilus on Performance,Pecking Behavior and Plasma 5-Hydroxytryptamine Level of Taihang Chickens with Different Feather Damage Degrees
The purpose of this experiment was to study the effects of Lactobacillus acidophilus on the perform-ance,pecking behavior and plasma 5-hydroxytryptamine(5-HT)level in Taihang chickens with different feather damage degrees.A two-factor experimental design was used in this experiment,factor 1 was the degree of feather damage(normal or damage),factor 2 was the supplemental level of Lactobacillus acidophilus(0,0.1％,0.2％or 0.3％).A total of 240 Taihang chickens of 42 weeks of age with normal feathers and 240 with damaged feathers were randomly divided into 4 groups,and fed diets supplemented with 0(basal diet group),0.1％,0.2％and 0.3％Lactobacillus acidophilus based on the basal diet,respectively.Each group consisted of 6 replicates with 10 chickens per replicate.The pre-trial duration was 7 days,and the formal trial duration was 56 days.The results showed as follows:1)compared with the basal diet group,adding 0.1％,0.2％and 0.3％Lactobacillus acidophilus significantly decreased the number of feather pecking(P＜0.05),significantly decreased the level of plasma corticosterone(CORT)(P＜0.05),and significantly decreased the relative a-bundance of Desulfobacterota in cecal microflora(P＜0.05);adding 0.2％and 0.3％Lactobacillus acidophilus significantly increased the average egg weight(P＜0.05),significantly increased the relative abundance of Lac-tobacillus in cecal microflora(P＜0.05),significantly decreased the relative abundance of Megamonas in cecal microflora(P＜0.05),significantly increased the plasma 5-HT level(P＜0.05),and significantly decreased the plasma 5-hydroxyindole acetic acid(5-HIAA)/5-HT ratio(P＜0.05);in addition,adding 0.2％Lactoba-cillus acidophilus significantly increased the laying rate,significantly decreased the number of pecking(P＜0.05),and significantly increased the plasma 5-HIAA level(P＜0.05).2)Compared with the normal group,the average daily feed intake(ADFI),feather pecking number and the relative abundance of Desulfobacterota were significantly increased(P＜0.05),the land pecking number and objecting number were significantly de-creased(P＜0.05),and the plasma tryptophan(Trp),5-HIAA levels and 5-HIAA/5-HT ratio were signifi-cantly decreased in the damaged group(P＜0.05).In conclusion,feather damage can increase the occurrence frequency of feather pecking of Taixing chickens.Adding Lactobacillus acidophilus to the diet can reduce the occurrence frequency of feather pecking behavior and improve animal welfare and performance by regulating gut microbiota and enhancing plasma 5-HT level.[Chinese Journal of Animal Nutrition,2024,36(3):1641-1651]
万方数据
维普
