Influence of Dietary Supplementation of Guava Leaf, Oxytetracycline, and Tert‐Butylhydroxytoluene on Growth Performance, Gut Microbial Population, Immune Status, Carcass, and Meat Quality in Broiler Chickens
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Date
2022-06
Journal Title
Journal ISSN
Volume Title
Publisher
Iranian Journal of Applied Animal Science
Abstract
This study investigated the effects of dietary supplementation of guava leaf (GL), oxytetracycline, and tertbutylhydroxytoluene on growth, immune status, gut microbial population, and meat quality of broiler
chickens. A total of 280 Ross 308 one-day-old chicks were randomly allotted to either G-0; basal diet (BD)
without additive; G-1; BD + 0.5 g/kg oxytetracycline + 0.15 g/kg tert-butylhydroxytoluene; G-2; BD + 2.5
g/kg GL; or G-3; BD + 5 g/kg GL for six weeks. At 1-21 d, G-1 and G-2 birds had higher (P<0.05) body
weight gain (BWG) and feed efficiency compared with G-0 and G-3 birds. At 22-42 d, the supplemented
birds consumed more feed than the G-0 birds. At 1-42 d, BWG and feed intake were higher (P<0.05) in the
supplemented birds compared with the G-0 birds. Hematological indices were not affected by the diets. GLsupplemented birds had lower (P<0.05) serum and meat cholesterol than the G-0 and G-1 birds. The G-0
birds had higher tumor necrosis factor-α (83.69 pg/mL) and lower interleukin-10 (5.84 pg/mL) than birds
fed other diets. The G-3 birds had lower (P<0.05) interleukin-1β and immunoglobulin M than other birds.
Dietary supplements lowered (P<0.05) clostridium, coliforms, and salmonella counts in caecum and ileum.
GL-supplemented birds had a higher ileal Lactobacillus count than G-0 and G-1 birds. Carbonyl and
malondialdehyde contents were lower (P<0.05) in the supplemented meat on day 4 postmortem. Antioxidant enzymes and total antioxidant capacity were higher in the G-3 meat compared with other meats. Breast
meat quality was not affected by diet. GL could be a potent antioxidant and antimicrobial in broiler diets.