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- W4382933191 abstract "Many studies have shown that thermal manipulations during the incubation (TMI) and naked neck gene (Na) positively affect heat-stressed broilers' thermotolerance, hatching process, and post-hatch performance. Their combination could increase the beneficial effect on broilers reared under natural tropical climatic conditions. The aim of this study was to investigate the effects of the Na gene and TMI on hatching and post-hatch performance of slow-growing broilers under tropical climates. The study included 1200 hatching eggs from two different crosses: (1) females and males, both with a normal or fully feathered neck (na na group), and (2) females (with a normal neck) and males (bare neck) (Na na group), incubated in similar conditions until day 7. Thereafter, they were assigned to 3 sub-groups for each cross: the control group (C) was incubated at standard incubation conditions (37.8°C, 60% RH). The TMI-1 group was subjected to TMI-1 (T°=38.5°C, RH=65%, E10-18, 6h/day) and TMI-2 group to TMI-2 (T°=39.5°C, RH=65%, E7-16, 12h/day). Between 450 and 504 h of incubation, eggs were checked for hatching events. During the post-hatch phase, chicks from each incubation sub-groups (Na na-C, Na na-TMI-1, Na na-TMI-2, na na-C, na na-TMI-1, na na-TMI-2) were raised for 12 weeks at a tropical natural ambient temperature. Hatchability, hatching time, chick's temperature, final body weight (FBW), and feed conversion ratio (FCR) were determined. The results revealed that the Na gene reduced (p˂0.05) hatchability. The control group had the highest mortality rate compared to TMI-1 and TMI-2 groups. There was an interaction between genotype and TMI on incubation duration, hatching weight, chick quality, FBW, and FCR (p˂0.05). In conclusion, the Na gene influenced the effects of thermal manipulation. TMI-1 combined with Na gene improved the productive performances of broilers in a tropical climate." @default.
- W4382933191 created "2023-07-04" @default.
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- W4382933191 date "2023-10-01" @default.
- W4382933191 modified "2023-10-16" @default.
- W4382933191 title "Naked neck gene and intermittent thermal manipulations during embryogenesis improve posthatch performance and thermotolerance in slow-growing chickens under tropical climates" @default.
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- W4382933191 doi "https://doi.org/10.1016/j.psj.2023.102912" @default.
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