The effects of protein, amino acid, and dietary electrolyte balance on broiler chicken performance and blood parameters under heat stress/Efeitos de proteina, amino acido e balanco alimentar eletrolitico no desempenho de aves de corte e parametro sangufneos sob estresse calorico

• Published in: Acta scientiarum. Animal sciences Vol. 38; no. 3; p. 285
• Main Authors: Saki, Ali Asghar, Maleckey, Mostafa, Johari, Rahele, Goudarzi, Sara Mirzaie, Abdolmaleki, Mansoureh
• Format: Journal Article
• Language: Spanish
• Published: Universidade Estadual de Maringa 01.07.2016
• Subjects: Amino acids; Electrolytes
• ISSN: 1806-2636; 1807-8672
• DOI: 10.4025/actascianimsci.v38i3.30747

The effect of crude protein (CP), amino acid (AA), and dietary electrolyte balance (DEB) were evaluated on blood parameters, carcass traits, and broiler performance under heat stress (29-34[degrees]C). A total of 540 male chickens (Ross 308) were allocated to 12 diets with factorial arrangement 2 X 2 X 3, using a completely randomized design with three replicates of 15 chickens in grower (13 to 26 days) and finisher (27 to 42 days) periods. and 120, 220, and 320 mEq [kg.sup.-1] DEB. The level of 21% CP increased body weight gain (BWG) and decreased feed conversion ratio (FCR) at grower period (p < 0.05). In contrast, 20% CP level decreased BWG and increased FCR at finisher period (p < 0.05). Further, 20% CP level reduced blood sodium and blood electrolyte balance (p < 0.05). The highest blood electrolyte balance was achieved by DEB 320 mEq [kg.sup.-1] diet (p < 0.05). Broiler response to DEB in heat stress depended on the age of bird, length of exposure to high temperature and CP level of the diet. Under heat stress (29-34[degrees]C), the 21% CP level at grower period and 17% CP level at finisher period improved broiler BWG and FCR. Keywords: standard and additional of digestible amino acid, heat stress, carcass traits. O efeito de proteina bruta (PB), amino acido (AA) e balanco alimentar eletrolitico (DAE) foi avaliado por parametros sanguineos, caracteristicas da carcaga e desempenho de aves de corte sob estresse calorico (29-34[degrees]C). Quinhentos e quarenta machos (Ross 308) foram alocados em 12 regimes alimentares num arranjo fatorial 2X 2X 3 totalmente aleatorio com 3 repeticoes de 15 aves em periodos de crescimento (13 a 26 dias) e terminacao (27 a 42 dias) e 120, 220 e 320 mEq [kg.sup.-1] DAE. Alem disso, 21% de PB aumentou o ganho de peso corporal (GPC) e diminuiu a conversao alimentar (CAR) no periodo de crescimento (p < 0.05). Por outro lado, 20% de PB diminuiu GPC e aumentou CAR no periodo terminal (p < 0.05). O nivel de 20% PB reduziu o sodio sanguineo e o balanco eletrolitico sanguineo (p < 0.05). O maior balango eletrolitico sanguineo ocorreu com DAE 320 mEq [kg.sup.-1] dieta (p < 0.05). A resposta das aves de corte a DAE no estresse calorico dependia da idade da ave, a exposicao a altas temperaturas e ao nivel de PB na dieta. Sob estresse calorico (29-34[degrees]C), 21% PB no periodo de crescimento e 17% de PB no periodo de terminacao melhoraram o GPC e CAR das aves de corte. Palavras-chave: amino acido padrao e adicional, estresse calorico, caracteristicas da carcaga.