Effects of postbiotic, probiotic and multhiomycin in low protein diet on performance, carcass characteristics and microbial population in broiler chicks

Articles in Press

Document Type : Research Paper

Authors

1 Department of Animal Science, College of Animal Sciences and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran.

2 Department of Animal Science, College of Animal Science and Fisheries, Sari Agricultural Sciences and Natural Resources University, Sari, Iran

Abstract

In order to compare the effects of postbiotic, probiotic and multhiomycin in low protein diet on performance, carcass characteristics and microbial population of broiler chickens, an experiment was conducted using 200 male broiler chickens of Ross 308 strain in a completely randomized design with five treatments, four replications and 10 birds per replication for 42 days. The experimental treatments included: 1- Recommended crude protein diet without additives, 2- Low protein diet (95% of recommended requirements) without additives, 3- Low protein diet + postbiotic, 4- Low protein diet + 0.02% probiotic, 5- Low protein diet + 0.03% multhiomycin. Feed intake, weight gain, and feed conversion ratio of the chicks were calculated periodically and throughout the breeding period. The results showed that reducing the dietary protein level without and with adding of postbiotic and probiotic to the diet had not significant effect on feed intake, weight gain, and feed conversion ratio in the starter, growth, finisher, and whole periods of the experiment. Treatment containing 0.03% multhiomycin significantly reduced feed consumption in the starter and whole periods (P<0.05). The percentage of carcass in the treatment containing 0.03% multhiomycin was significantly lower than the other groups (P<0.05). No significant difference was observed between the experimental treatments in terms of feed conversion ratio inut the whole period. The percentage of thymus in the treatment containing postbiotic (treatment 3) was higher than the treatments 1, 2 and 4. The percentage of spleen in treatment 2 was significantly higher than the treatments 1, 3, and 5 (P<0.05).

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Iranian Journal of animal Science

Articles in Press, Accepted Manuscript
Available Online from 04 January 2026

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History

  • Receive Date: 07 September 2025
  • Revise Date: 25 October 2025
  • Accept Date: 11 November 2025

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