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Abstract

This study examines the effects of the dietary supplementation with Lactobacillus acidophilus D2/CSL (CECT 4529) (LA) on productive performances, incidence of foot pad dermatitis and caecum microbioma in broiler chickens. A total of 1,100 one-day old male Ross 308 chicks were divided into 2 groups of 16 replicates with 25 birds each and reared from 1-41 d. One group was fed a basal diet (CON) and the other group the same diet supplemented with LA. Caecum contents were collected from 4 selected birds at day one and 5 selected birds at the end of the rearing period. Then, they were submitted to DNA extraction and whole DNA shotgun metagenomic sequencing. Overall, the LA supplementation produced a significant beneficial effect on body weight gain between 15-28 d and improved feed conversion rate in the overall period. On the contrary, litter moisture, pH and incidence of the foot pad lesions were not affected by LA. Birds treated with LA showed a lower occurrence of pasty vent at both 14 and 28 d. At the end of the rearing period, Lachanospiraceae were significantly higher in LA birds in comparison to CON (17.07 vs 14.39%; P = 0.036). Moreover, Ruminococcus obeum, Clostridium clostridioforme, Roseburia intestinalis, Lachnospiraceae bacterium 14-2T and Coprococcus eutactus were significantly higher in LA birds in comparison to CON. The relative abundance of Lactobacillus acidophilus was comparable between LA and CON groups. However, a positive effect was observed in relation to the metabolic functions in the treated group, with particular reference to the higher abundance of β-glucosidase. In conclusion, the LA supplementation improved broiler productive performances and metabolic functions promoting animal health.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus acidophilus LA-02Improved Feed Conversion RateBeneficial
Large
Lactobacillus acidophilus LA-02Increased Abundance of Clostridium clostridioformeBeneficial
Small
Lactobacillus acidophilus LA-02Increased Abundance of Coprococcus eutactusBeneficial
Small
Lactobacillus acidophilus LA-02Increased Abundance of Roseburia intestinalisBeneficial
Small
Lactobacillus acidophilus LA-02Increased Body WeightBeneficial
Large
Lactobacillus acidophilus LA-02Increased Lachnospiraceae Species AbundanceBeneficial
Small
Lactobacillus acidophilus LA-02Increased β-glucosidase LevelsBeneficial
Moderate
Lactobacillus acidophilus LA-02Reduced Occurrence of Pasty VentBeneficial
Moderate
Lactobacillus acidophilus LA-02Reduced Ruminococcus AbundanceBeneficial
Small
Lactobacillus acidophilus La-14Improved Body WeightBeneficial
Moderate
Lactobacillus acidophilus La-14Improved Feed Conversion RateBeneficial
Large
Lactobacillus acidophilus La-14Improved Metabolic FunctionBeneficial
Large
Lactobacillus acidophilus La-14Increased Gut Microbiota AbundanceBeneficial
Moderate
Lactobacillus acidophilus La-14Reduced Occurrence of Pasty VentBeneficial
Moderate
Lactobacillus acidophilus LA-5Improved Body WeightBeneficial
Moderate
Lactobacillus acidophilus LA-5Improved Feed Conversion RateBeneficial
Large
Lactobacillus acidophilus LA-5Improved Metabolic FunctionBeneficial
Large
Lactobacillus acidophilus LA-5Increased Beneficial Gut MicrobiotaBeneficial
Moderate
Lactobacillus acidophilus LA-5Reduced Occurrence of Pasty VentBeneficial
Moderate

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