Níveis de fósforo disponível e tamanho de partícula do fosfato bicálcico na dieta de poedeiras comerciais de 24 a 58 semanas de idade

Abstract

RESUMO -Um experimento foi conduzido para verificar o efeito de níveis de fósforo e do tamanho de partícula do fosfato bicálcico na dieta de poedeiras comerciais na fase de produção. Utilizou-se um delineamento experimental inteiramente casualizado, em esquema fatorial 2 × 3 com dois tamanhos de partícula do fosfato (fino e granulado) e três níveis de fósforo disponível (0,28; 0,38 e 0,48%), totalizando seis tratamentos, cada um com cinco repetições de oito aves. As dietas experimentais foram isoproteicas, isocalóricas e isocálcicas. O consumo de ração, a produção de ovos, a massa de ovos, a conversão alimentar, a porcentagem de casca, a gravidade específica e os teores de cinzas, cálcio, fósforo e magnésio nos ossos não foram afetados pelas dietas. Dietas contendo fosfato bicálcico (fino ou granulado) e 0,28% de fósforo disponível atendem às exigências de fósforo de galinhas poedeiras semipesadas de 24 a 58 semanas de idade.Palavras-chave: desempenho, minerais ósseos, poedeiras, qualidade de casca Levels of the available phosphorus and particle size of dicalcium phosphate in brown egg layer hens diet from 24 to 58 weeks of age ABSTRACT -An experiment was carried out to verify the effect of levels of phosphorus and the particle size of dicalcium phosphate on diets for brown egg layer hens during production phase. A complete randomized experimental design as a 2 × 3 factorial arrangement, with two sizes of particles of phosphate (fine and granulate) and three levels of available phosphorus (0.28, 0.38 and 0.48%), totalizing six treatements with five replications of eight birds each, was used. The experimental diets were isoproteic, isocaloric, and isocalcium. Feed intake, egg production, egg mass, feed conversion, shell percentage, egg specific gravity, ash, calcium, phosphorus and magnesium levels in the bones were not affected by the diets.Diets with dicalcium phosphate (fine or granulated) and 0.28% available phosphorus level meet the phosphorus requirements in brown egg layer hens from 24 to 58 weeks of age.

Digestibility of calcium and digestible calcium from inorganic sources evaluated in swine by two methods

“…Ammerman et al (1995) reported in its work that particle size is a determinant factor in the availability of calcium and phosphorus in the defluorinated phosphates, since the solubility of a phosphate increases as it reduces the particle size of the food. However, work published by Araújo et al (2010) showed that particle size did not influence the variables of laying rate, feed conversion, egg weight, egg mass, percentage and shell thickness, and egg specific gravity of commercial laying hens, indicating that the availability of calcium and phosphorus was not influenced by the granulometry of the food. There was a difference between the direct and indirect methods only for the apparent digestibility coefficients of the calcium sources (P <0.05).…”