Effect of different levels of synbiotic on performance, intestinal microbial population and morphology of broiler chicks subjected to chronic heat stress and estimation of optimal point of synbiotic using broken line modeling

Author(s):
Message:
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:

This study aimed to investigate the effects of different levels of synbiotic on performance, intestinal microbial population and morphology of broiler chicks subjected to chronic heat stress and estimation of optimal point of synbiotic using broken line modeling. In total, 240 one-day-old (Ross 308) broiler chicks were allocated into four experimental treatments with five replications (12 chicks) in complete random design. Treatments containing 0, 0.5, 1.0 and 1.5 (g/Kg) synbiotic added to experimental diet from 3 to 42 days. Chronic heat stress was induced from 28 to 42 days of age to all groups (32 degree Celsius for 6 hours, from 10:00 am to 4:00 pm).The results showed that synbiotic improved body weight gain and feed intake significantly to 28 day and during chronic heat stress (p≥0.05). So that, the groups receiving 1 and 1.5 (g/kg) of synbiotic had the highest performance. Treatments affected microbial population and caused increasing lactic-acid producing bacteria (p≥0.05). Moreover, the result showed that treatments made significant difference in intestinal morphology and increased villus height (p≥0.05). European production index significantly increased the groups receiving 1 and 1.5 (g/kg) of synbiotic (p≥0.05). The results of this study showed that using synbiotic during chronic heat stress, improved performance through positive changes in morphology and microbial population of intestine. Based on linear and quadratic broken line modeling, the optimal point of synbiotic are 1.3 and 1.42 (g/Kg diet) respectively.

Language:
Persian
Published:
Animal Sciences Journal, Volume:37 Issue: 144, 2024
Pages:
79 to 92
https://www.magiran.com/p2803361