Níveis de cálcio e de fósforo em dietas para codornas japonesas de 45 a 57 semanas de idade

• Autor(a) principal: Costa, Carlos Henrique Rocha
• Data de Publicação: 2009
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/1727
• topic: Cálcio; Codorna japonesa; Fósforo disponível; Calcium; Japanese quails; Available phosphorus; CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL

Two experiments were conducted with the objective of determining the levels of calcium (Ca) and available phosphorus (aP) for Japanese quails (Coturnix coturnix japonica) in the final third of the production cycle (45 to 57 weeks of age). It was used respectively for determining the nutritional level of Ca and aP, 350 and 300 Japanese quail females, and in both experiments the birds were initially 313 days old. The experimental design was completely randomized, using five levels of Ca (2.2, 2.6, 3.0, 3.4 and 3.8%), seven replicates and ten birds per experimental unit. For the determination of aP were used five levels (0.15, 0.25, 0.35, 0.45 and 0.55%), six replicates and ten birds per experimental unit. The experimental diets contained 2900 Kcal metabolizable energy/kg and 20% crude protein. The determination of the appropriate level of Ca and aP was estimated through the consumption of ration, egg production bird/day and bird/lodged, viable for commercialization, viable bird/day, profit of corporal weight, viability, weight and mass of eggs, alimentary conversion for mass and dozen eggs, specific weight of eggs, percentage and weight of shell, percentage and weight of yolk, percentage and weight albumen, shell thickness, height and diameter of eggs and contents of Ca, P, Mg and ash in the shell, not measuring the thickness of the shell, being evaluated: content of Ca, P, Mg and ash in the tibia and in the excreta, pH of the yolk, the albumen and excreta, length and weight of the tibia and femur. Increased levels of calcium in the diet improved the conversion of mass and per dozen eggs, the thickness of the shell, and significantly influenced the weight of the yolk and the shell of analyzed eggs analyzed, and the percentage of shell eggs. It was also observed reduction in levels of P, Ca and Mg of the shell with the increase levels of Ca in the diet. For the others evaluated parameters it did not have significant effect of the levels of calcium in the diet. In the experiment of P, increased levels of this mineral in the diet increased linearly the weight, the deposition of Ca in the tibia and the content of Mg in the tibia, but reduced linearly the height of eggs analyzed. There was a quadratic effect for specific weight, shell weight, shell percentage and content of Ca excreted, being the optimum levels of 0.43%, 0.41%, 0.42% and 0.34% respectively. Beyond these variables, the content of Ca in the shell of the egg, ash content and P excreted and P content of the tibia also showed a quadratic effect, being the optimum levels of 0.27%, 0.30%, 0.43% and 0.42% respectively. For the other parameters evaluated there was no effect on levels of aP in the diet. It is concluded that the nutritional levels for Japanese quails in the final third of the production cycle (45 to 57 weeks of age) is of at least 3.8% Ca in the diet, which corresponds to a daily intake of 982 mg of Ca/bird and a maximum of 0.15% Pd in the diet, corresponding to a daily consumption of 38 mg of Pd/bird.