Effects of vitamin A on carcass and meat quality of broilers.

Autor:	Savaris VDL; University Center of Cascavel - UNIVEL, Cascavel-PR, 85806-080, Brazil. Electronic address: vaneilalenha@hotmail.com., Broch J; Protege Nutrition and Animal Health, Vila Maria-RS, 99155-000, Brazil., de Souza C; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., Rohloff Junior N; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., de Avila AS; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., Polese C; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., Kaufmann C; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., de Oliveira Carvalho PL; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil., Pozza PC; State University of Maringá - UEM, Maringá-PR, 87020-900, Brazil., Vieites FM; Federal University of Juiz de Fora - UFJF, Juiz de Fora-MG, 36036-900, Brazil., Nunes RV; Western Paraná State University - UNIOESTE, Marechal Cândido Rondon-PR, 85960-000, Brazil.
Jazyk:	angličtina
Zdroj:	Poultry science [Poult Sci] 2021 Dec; Vol. 100 (12), pp. 101490. Date of Electronic Publication: 2021 Sep 17.
DOI:	10.1016/j.psj.2021.101490
Abstrakt:	This study evaluated the level and length of time of vitamin A supplementation and its effects on carcass and cuts yield, meat quality, and myopathies in 42-day-old broilers. A total of 1,920 birds were divided into 6 groups, and each group received a different level of vitamin A: 0; 6,000; 16,000; 26,000; 36,000 and 46,000 IU/ kg. From d 1 to 21, the treatments were distributed among 16 replicates with 20 birds. From the 22nd d on, 8 repetitions remained with the initial treatment and the others received diets with no vitamin A supplementation. Twelve birds were slaughtered per treatment to evaluate carcass and cuts yield, shear force, cooking loss, water holding capacity, and the presence of substances reactive to thiobarbituric acid. The remaining birds were slaughtered and evaluated in loco for Wooden Breast (WB) and White Striping (WS). Wings weight was affected by vitamin A levels. The duration of the vitamin A supplementation process had effects on the weight of breast, legs with a dorsal portion, and meat color in the yellow intensity (b*). Incidence of WB had higher scores in birds supplemented until 42 d of age. WS showed a quadratic response and a lower response with supplementation of 29,700 IU/ kg. Even for WS, a higher occurrence of the normal score was found in birds supplemented until 21 d of age. Minimal quadratic responses were obtained for normal, moderate, and severe scores, in supplementations of 29,301; 29,959, and 29,827 IU/ kg, respectively. WB had lower occurrence rates in birds supplemented until 21 d of age. Consequently, the severe score was more frequent when supplementation was provided until 42 d of age. The level of vitamin A and the length of time during which this supplementation was provided had influence on cuts yield, meat color and the incidence of WB and WS of the 42-day-old birds. (Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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