Utilização de levedura viva na dieta de bubalinos em confinamento

Abstract

Live yeasts have favorable characteristics for use in animal feed, in particular of ruminants, being able to become a beneficial tool to improve digestive efficiency in buffaloes. In view of the above, the objective was to evaluate the performance productive, feed efficiency, and digestibility of buffaloes diet in confinement, supplemented with Saccharomyces cerevisiae yeast strain KA500. Eighteen buffaloes of Murrah race, whole males, with initial weigthing 250 ±31kg (average ± desvio padrão), and age ±12 months, formed tem blocks based on live weigth, randomly allocated to one of two treatments in design blocks at random, adjusted to covariate and with structure of repeat measures in time. The animals were individually fed daily (2x/day) in tie stall confinement, receiving water ad libitum. The treatments were: use of live yeast (10g of product be able to form 2x1010 UFC) and control treatments. The experimental diet was composed based on dry matter (%DM) of 29,2% silage elephant grass, 23,1% ground corn, 7,2% soybean meal, 2,0%, 16,3% soybean hull, 21,8% cupuassu cake, 1,6% vitamin and mineral complex and 0,8% urea. Being the same diet for both treatments. The dados evaluated only once during the experiment were analyzed by same statistical model, but with no covariate effect, time and interaction treatment over time. The daily weight gain showed a reduction tendency (P = 0.07) with the addition of live yeasts. There was a numerical reduction of CMS daily and in% of live weight. There was no response from live yeast supplementation on the variables of gain / kg feed efficiency, morphological measurements of height of withers, croup, ECC, plasma ureic nitrogen, purine derivatives - allantoin and creatinine, plasma glucose levels, total weight gain and carcass yield. The digestibility of DM and OM were lower (P <0.05) with the supplementation of live yeasts. While digestibility of NDF and digestibility of non-NDF MO were not affected by the supplementation of live yeast. It was concluded that the strain and dosage of live yeast used did not show a positive effect on the performance of buffaloes and the nutrient digestibility of the diet.