Biodisponibilidade de fósforo de leveduras spray-dry na alimentação de suínos na fase inicial (15-30 kg)

Abstract

Two experiments were carried out to determine the bioavailability of phosphorus in two spray dried yeast (sugar cane yeast- SCYSD and mixed sugar cane + brewer?s yeast BYSD), in starting pigs fed, compared different methods: true (CDTP) and apparent (CDAP) digestibility coefficients of phosphorus, the method of regression coefficient or slope ratio method and the standard curve. In the first experiment total digestibility assays were carried out with 30 barrow pigs, with initial weight of 22.69 ± 4.24 kg allotted in a completely randomized designo There were determined the yeast coefficients of digestibility, a reference diet and a diet with low content of total phosphorus (0.06%) to estimate endogenous losses of phosphorus. The average values of CDAP and CDVP were 62.68 and 64.15% for SCYSD and 77.01 and 79.33% for BYSD. The CDAP and CDVP for BYSD were higher (P<0.05) than the values of SCYSD. In the experiment 11 was conducted a test of grawth, using 56 pigs (barrow and gilts), with initial weighing of 15.11 ± 3.43 kg allotted in a completely randomized design, with seven treatments, four replications and two pigs per experimental unit. The treatments consisted of a basal diet without supplementation with P and supplementation of two levels of P (0.053 and 0.105%) fram dicakium phosphate (DP), SCYSD and BYSD. For relative bioavailability of phosphorus a difference was observed (P <0.05) between the two yeasts, obtaining the average value of 50.21 % for SCYSD and 88.69% for BYSD, which corresponds to 0.26% and 0.38% available phosphorus respectively.