Níveis de fósforo disponível em rações para suínos de alto potencial genético para deposição de carne dos 15 aos 60 kg / Available phosphorus levels in diets for swine with high genetic potential for meat deposition from 15 to 60 kg

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

Two experiments were conducted to evaluate the available phosphorus (AP) levels in diets for swine of high genetic potential for meat deposition, from 15 to 60 kg. In the first experiment, 60 commercial hybrids pigs, were used being 30 castrate males and 30 females, with initial weight of 15.00 0.41 kg, distributed in a completely randomized experimental design, with six treatments, five repetitions and two animals, one of each sex, for each experimental unit. The treatments were constituted on a basal diet and other five diets obtained by the supplementation of the basal diet with dicalcium phosphate to obtain six levels of AP (0.114; 0.211; 0.328; 0.435; 0.542 e 0.649%). In the second experiment, 60 female commercial hybrids pigs, with initial weight of 30.00 0.618 kg were used, distributed in a completely randomized experimental design, with five treatments, six repetitions and two animals for each experimental unit. The treatments were constituted of a basal diet and other four diets obtained by the supplementation of the basal diet with dicalcium phosphate to obtain five levels of AP (0.115; 0.195; 0.275; 0.355 and 0.435%). In the first experiment, the levels of AP have influenced the feed daily intake (FDI), which increased in a linear form. The daily weight gain (DWG) and the feed conversion (FC) improved in a quadratic form with the increase of the AP levels, until the estimated levels, respectively, of 0.509 and 0.477% of AP. The treatments have influenced in a quadratic form the bone resistance (BR), which increased until the estimated level of 0.529% of AP. The contents of calcium (CaB) and phosphorus (PB) in the bone increased in a quadratic form in function of the treatments until the estimated levels, respectively, of 0,619 and 0.596% of AP. There was not observed any effect of the AP levels over the bone ash (BA) content. In the second experiment, there was not observed any effect of the AP levels over the FDI. The levels of AP have influenced the DWG from the animals and the FC in a linear form, where the DWG increased until the level of 0.358% of AP, maintaining in a plateau. The FC improved until 0.364% of AP, where kept in a plateau. The BR, the levels of PB and the BA percentage were influenced in an increasing linear form by the AP levels from the diets. There was not effect of the AP levels over the quantity of CaB. It is concluded that the diet AP levels which propitiate the better results of weight gain and feed conversion of high genetic potential swine for meat deposition, from 15 to 30 kg and from 30 to 60 kg, are respectively 0.509 and 0.477%; and 0.358 and 0.364%, corresponding to the daily consumption estimated on 6.39 and 5.93 g; 7.64 and 7.77g, respectively.

ASSUNTO(S)

requirements nutricao e alimentacao animal available phosphorus exigências swine suíno fósforo disponível

ACESSO AO ARTIGO

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