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• W4386718472 abstract "Antioxidants such as vitamin C (VC) and green tea extract (GTE) have been reported to have various antioxidant functions and are used as one of the nutritional approaches to alleviate heat stress (HS) in chickens. However, studies on the feeding timing that can produce optimal effects have not been reported. In this study, the stress-relieving effect of VC and GTE addition timing was investigated in high-temperature broiler chickens. A total of 880 1-d-old male chickens were used, and the treatments were as follows: no feed additives provided, CON; VC 250 mg/kg added from 1 d, VC1; GTE 600 mg/kg added from 1 d, GTE1; VC 250 mg/kg added from 22 d, VC22; GTE 600 mg/kg added from 22 d, GTE22. The HS environment was provided for 2 wk from the 22 d and was set at 33 ± 1 °C, 55 ± 10% for 24 h. Feed and water were provided ad libitum. Broiler production was similar in all treatments. In chicken meat quality, the addition of VC and GTE had an effect on meat color and pH (P < 0.05). In particular, GTE had a positive effect on the antioxidant capacity and quality preservation of breast meat (P < 0.05). In blood characteristics, GTE1 significantly lowered the level of total cholesterol, and VC1 affected AST and IgM (P < 0.05). Interestingly, the VC1 group had a positive effect on the maintenance and development of intestinal morphology, a lower rectal temperature, and showed to relieve stress. In conclusion, the addition of VC and GTE has been shown to alleviate the high-temperature stress of broilers, and in the case of VC in particular, feeding from 1 d appeared to alleviate stress more effectively. This study suggests that it is important to determine the appropriate timing of addition of functional substances in order to effectively reduce various stresses that occur in livestock rearing.The increasing frequency of exposure to high-temperature environments has prompted research into nutritional approaches to alleviate heat stress in chickens, but little research has been reported on feeding timing. The aim of this study was to determine the effect of feeding timing on the effectiveness of the natural antioxidants vitamin C (VC) and green tea extract (GTE). Production was similar among all treatments, and GTE fed from 1 d of age increased antioxidant capacity, including DPPH, FRAP, and MDA in carcass quality. VC fed from 1 d of age decreased AST and increased IgM in the blood, and increased villus height (VH), with a positive effect on intestinal development. In conclusion, feeding VC and GTE from 1 d of age has been shown to effectively alleviate stress by increasing antioxidant capacity in breast meat, positively changing total cholesterol, AST, and IgM in the blood, and maintaining intestinal morphology, and it is important to set the timing of feeding to increase the effectiveness of the additives." @default.
• W4386718472 created "2023-09-14" @default.
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• W4386718472 date "2023-01-01" @default.
• W4386718472 modified "2023-10-17" @default.
• W4386718472 title "A comparative study on feeding timing and additive types of broilers in a high-temperature environment" @default.
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• W4386718472 doi "https://doi.org/10.1093/jas/skad290" @default.
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• W4386718472 hasPublicationYear "2023" @default.
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