China Animal Husbandry and Veterinary Medicine ›› 2024, Vol. 51 ›› Issue (10): 4352-4363.doi: 10.16431/j.cnki.1671-7236.2024.10.016

• Nutrition and Feed • Previous Articles    

Effect of Bacillus coagulans on Growth Performance,Antioxidant Capacity and Immune Function of Laying Chicks Infected with Salmonella Pullorum

TIAN Guangming1, MA Li1, PU Yuejin2, YOU Lei1, WANG Haojie1, ZHANG Yinghu1, FANG Chun1, LIANG Xiongyan1, WEN Zhenyu1, TAN Lei1, ZHENG Minghao1   

  1. 1. College of Animal Science and Technology, Yangtze University, Jingzhou 434025, China;
    2. Hubei Provincial Livestock Technology Extension Center, Wuhan 430064, China
  • Received:2024-04-15 Published:2024-09-30

Abstract: 【Objective】 The experiment was conducted to investigate the effects of feed supplementation with avian autochthonous Bacillus coagulans BC-362 on the growth performance,antioxidant capacity and immune function of laying chicks infected with Salmonella Pullorum (SP).【Method】 150 one-day-old healthy Jinghong-1 SPF laying chicks with similar body weights were randomly divided into control group (group A),probiotic group (group B),SP + probiotic group (group C),SP + antibiotic group (group D),and SP model group (group E). Each group was comprised of 6 replicates,with five chicks per replicate. The basal diet was given to groups A,D,and E,while groups B and C were supplemented with 1.0×108 CFU/g of Bacillus coagulans in the basal diet. At 7 days,groups C,D,and E were gavaged with 1.0×109 CFU of SP (0.5 mL),and groups A and B were gavaged with the same dose of sterile water. Additionally,group D was supplemented with 0.375 g/kg of neomycin sulphate in the basal diet starting from the second day of gavage. The experimental period lasted for 14 days. At 14 days,the growth performance of the chicks was measured; Blood,immune organs,and jejunum tissues were collected to determine levels of serum antioxidant and immunity,immune organ index,jejunum morphology,CD3 immunohistochemistry expression,and transcript levels of inflammatory and antioxidant-related genes.【Result】 ①Compared with group A,the average daily gain (ADG) of laying chicks in group B was significantly increased,and the feed to gain ratio (F/G) was significantly decreased (P<0.05). In group E,both the average daily feed intake (ADFI) and ADG of laying chicks were significantly decreased (P<0.05). Compared with group E,the ADFI and ADG of laying chicks in groups C and D were significantly increased (P<0.05). There were no significant differences in ADFI,ADG,and F/G of laying chicks between groups C and D (P>0.05).②Compared with group A,the activities of serum superoxide dismutase (SOD) and catalase (CAT) of laying chicks were significantly higher (P<0.05) in group B, and the activities of serum SOD,CAT and glutathione peroxidase (GSH-Px) and total antioxidant capacity (T-AOC) of laying chicks were significantly decreased (P<0.05),while the malondialdehyde (MDA) content were significantly increased (P<0.05) in group E.Compared with group E,serum SOD activity and T-AOC of laying chicks were increased significantly (P<0.05),and the MDA content of laying chicks were decreased significantly (P<0.05) in both groups C and D. The activities of serum CAT and GSH-Px of laying chicks in group C were significantly higher than those in group D (P<0.05). ③Compared with group A,the serum IgA and IgM contents of laying chicks were significantly higher in group B (P<0.05),while the serum IgA,IgM and IgG contents of laying chicks were significantly lower in group E (P<0.05). Compared with group E,the serum IgA,IgM,and IgG contents of laying chicks were significantly increased in groups C and D (P<0.05),with the IgM content of laying chicks in group C was significantly higher than that in group D (P<0.05).④Compared with group A,the thymus index of laying chicks were significantly higher in group B (P<0.05),and the immune organ index of laying chicks were significantly lower in group E (P<0.05). The thymus and bursa indices of laying chicks were significantly higher in groups C and D compared to group E (P<0.05). The spleen index of laying chicks were significantly higher in group C than that in group D (P<0.05). ⑤Compared with group A,there was no significant difference in the number of goblet cells and CD3 expression in jejunal tissues of laying chicks in group B (P>0.05),while the numbers of goblet cells and CD3 expression were significantly reduced in group E (P<0.05). The expression of CD3 in jejunal tissues of laying chicks were significantly higher in groups C and D compared to group E (P<0.05),and the number of goblet cells in jejunal tissues of laying chicks in group C was significantly higher than that in group D (P<0.05).⑥Compared with group A,the relative expression of inflammation-related genes Toll-like receptor 4 (TLR4),myeloid differentiation factor 88 (MYD88),nuclear factor kappa-B (NF-κB) and interleukin-6 (IL-6) in jejunal tissues of laying chicks were significantly downregulate in group B (P<0.05),while the relative expression of antioxidant-related genes Kelch-like ECH associated protein 1 (Keap1),glutathione peroxidase 1 (GPX1),and glutamate-cysteine ligase catalytic subunit (GCLC) were significantly upregulate (P<0.05). The relative expression of inflammation-related genes TLR4,MYD88,IL-1β,NF-κB and IL-6 in jejunal tissues of laying chicks in group E was significantly upregulated (P<0.05),while the relative expression of antioxidant-related genes NADH quinone dehydrogenase 1 (NQO1),heme oxygenase 1 (HO-1),GCLC,and nuclear factor E2-associated factor (Nrf2) were significantly downregulated (P<0.05). In groups C and D,the relative expression of inflammation-related genes TLR4,MYD88,IL-1β,NF-κB and IL-6 of laying chicks were significantly lower than those in group E (P<0.05),whereas the relative expression of antioxidant-related gene NQO1 and GCLC was significantly higher than in group E (P<0.05). Compared with group D,the relative expression of TLR4,MYD88,and IL-1β was significantly downregulate (P<0.05),and the relative expression of Keap1 and GCLC was significantly upregulate in group C (P<0.05).【Conclusion】 The supplementation of avian autochthonous Bacillus coagulans BC-362 to diets improved the growth performance of SP-infected laying chicks and enhanced the body’s antioxidant and immune capabilities,thereby reducing the intestinal inflammatory response infected with SP in laying chicks.

Key words: Bacillus coagulans BC-362; Salmonella Pullorum; growth performance; antioxidant capacity; immune function; laying chicks

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