Níveis nutricionais de fósforo disponível para aves de corte ISA Label criadas em semiconfinamento

Abstract

RESUMO -Foram realizados três ensaios para determinar os níveis nutricionais de fósforo disponível (Pd) para machos e fêmeas da linhagem ISA Label nas fases inicial (1 a 28 dias), crescimento (28 a 56 dias) e final (56 a 84 dias) criadas em semiconfinamento. Em cada ensaio, 480 aves com idade correspondente à fase de criação foram alojadas em 24 unidades experimentais contendo áreas de abrigo e de pastejo. O delineamento experimental utilizado foi o inteiramente casualizado, em esquema fatorial 4 × 2 (níveis de Pd e sexos) com três repetições de 20 aves. Os níveis de fósforo disponível avaliados foram: 0,25; 0,36; 0,47 e 0,58% na fase inicial; 0,18; 0,31; 0,44 e 0,57% na fase de crescimento; e 0,14; 0,27; 0,40 e 0,53% na fase final. Foram avaliados o ganho de peso, consumo de ração, consumo de Pd, conversão alimentar, teores de fósforo, cálcio e cinzas na tíbia e resistência à quebra óssea. De acordo com os resultados, o nível ótimo de Pd na ração na fase inicial, para machos e fêmeas são de 0,39 e 0,49%, que correspondem ao consumo de 3,94 e 3,96 g de Pd/ave, respectivamente. Para a fase de crescimento, recomenda-se 0,35% de Pd na ração para aves de ambos os sexos, que correspondem a consumo de 8,45 e 6,70 g de Pd/ave. Na fase final, recomendam-se os níveis de 0,32 e 0,30% de Pd, que correspondem a consumos de 12 e 9,5 g de Pd/ave para machos e fêmeas, respectivamente. Palavras-chave: aves de crescimento lento, cálcio, ossosNutritional levels of available phosphorus for ISA Label broilers chickens reared in free-range system ABSTRACT -It was performed three trials to determine the nutritional levels of available phosphorus (aP) for males and females of the strain ISA Label in the starter (1 to 28 days), growing (28 to 56 days) and finisher (56 to 84 days) phases, reared in a free-range system. In each trial, 480 birds with age corresponding to rearing phase were housed in 24 experimental units with shelter and pasture areas. It was used a complete random experimental design, in a 4 × 2 factorial scheme (levels of aP and sexes) with three replicates of 20 birds. The levels of aP evaluated were the following: 0.25, 0.36, 0.47 and 0.58% in the starter phase; 0.18, 0.31, 0.44 and 0.57% in the growing phase; and 0.14, 0.27, 0.40 and 0.53% in the finisher phase.Body weight gain, feed intake, aP intake, feed conversion, contents of phosphorus, calcium and ash in the tibia and bone breaking strength were evaluated. According to results, the optimum dietary aP levels in the starter phase, for males and females, are 0.39 and 0.49%, which correspond to the intake of 3.94 and 3.96 g of aP/bird, respectively. For the growing phase, it is recommended 0.35% of aP in the diet for birds of both sexes, which correspond to an intake of 8.45 and 6.70 g of aP/bird.In the finisher phase, it is recommended the levels 0.32 and 0.30% of aP, which corresponds to intakes of 12 g and 9.5 g aP/birdfor males and females, respectively. IntroduçãoNa criação comercial de aves alternativas, utiliza-se material genético melhorado, em geral, híb...

Available phosphorus in starter diets for meat-type quail

“…Phosphorus is an element of adenosine triphosphate (ATP), a molecule that stores energy in the phosphate bonds for several biological processes. Thus, a diet deficient in phosphorus impairs ATP formation and leads to disturbances in the metabolism of energy and, consequently, to weight loss and a reduction in production (McDowell, 1992;Pinheiro et al, 2011). In this experiment, the lowest feed intake and weight gain were obtained at the 0.13% AP level; thus, this level led to a nutritional deficiency of phosphorus in the meat-type quail (C. coturnix coturnix) lineage LF1.…”

“…This response would be justified because the absorption of phosphorus depends on the absorption of calcium. In the bird's starter phase, the bone tissue formation rate is faster than it is in other phases, and the deposition of calcium and phosphorus in the tibia is also greater (Pinheiro et al, 2011).…”

Digestible threonine for slow-growing broilers: performance, carcass characteristics, intestinal mucin, and duodenal morphometry

“…The criterion for determining the feed requirement was the mean body weight of the animals rather than ages as described in the Brazilian table for poultry and swine (Rostagno et al, 2011). The values of available phosphorus and calcium suggested by Pinheiro et al (2011aPinheiro et al ( , 2011b were used.…”

Digestible Lysine Requirements the Performance, Carcass Traits and Breast Meat Quality of Slow-Growing Broilers

“…The criterion to determine the nutritional requirements was average body weight (BW), instead of age as described in the tables. The calcium and available phosphorus requirements used for feed formulation were based Pinheiro et al (2011a) and Pinheiro et al (2011b). Corn gluten, an ingredient that is limiting in lysine, was included in all experimental diets with the aim of obtaining a basal lysine value without decreasing the crude protein value of the diet.…”