Avaliação do uso de blend de levedura em rações para suínos de fase de creche, crescimento e terminação

Abstract

Was evaluated the effect of different yeast blend levels on pig performance in nursery, growth and finishing phases. Experiment 1: 84 weaned 21-day-old piglets weighing 6.87 ± 0.76 kg were used. The animals were individually identified and weighed for the formation of homogeneous groups by weight, using a block design of randow. The treatments were: T1 = basal diet, T2 = basal diet + 0.75 kg / t yeast Blend and T3 = basal diet + 1.5 kg / t yeast Blend. The inclusion of yeast in the piglet diet had no effect (P> 0.05) on the zootechnical parameters evaluated with average daily weight gain (GPMD), daily feed intake (CRD) and feed conversion (CA) from 21 to 59 days old. It was concluded that the zootechnical performance was not influenced by the inclusion levels of yeast Blend in weaning piglets diets from 21 to 59 days of age. Experiment 2: A total of 72 castrated 70-day-old male pigs weighing 25 kg live weight were used. A randomized complete block design was used. The treatments consisted of 4 levels of yeast blend inclusion: 0; 0.5; 1.0; and 1.5 kg / ton of feed. The experimental period was segregated into three phases: Growth I (70 to 91 days), Growth II (91 to 120 days) and Finishing phase (120 to 156 days), varying only the inclusion of yeast blend. The variables analyzed for daily average weight gain (GPMD), feed conversion (CA) and feedintake (CRD). They were subjected to statistical analysis using the regression test. The addition of yeast blend had no effect on the piglet performance in the Growth I phase (70 to 91 days) (p> 0.05). In the Growth II phase (91 to 120 days) theincrease in additive levels in feed improved (p <0.05) feed conversion of animals. During the Finishing phase (120 to 156), feedintake (CRMD) was reduced with the addition of yeast levels (p <0.049). The addition of 1.0 kg / ton yeast to the growing pig diet can improve feed conversion in the growing phase between 91 and 120 days.