Hang Lu，Pete Wilcock，Olayiwola Adeola，Kolapo M Ajuwon
Effect of live yeast supplementation to gestating sows and nursery piglets on postweaning growth performance and nutrient digestibility
The objectives of the current study were to determine the effects of live yeast (LY) supplementation of sows during gestation and lactation and to determine the effects of supplementation of their offspring after weaning on growth performance and nutrient digestibility. A total of 40 sows were assigned to two dietary treatments (control vs. LY) based on parity and expected farrowing date. Birth weight, weaning weight, litter size and mortality were measured. After weaning, 128 mixed-sex piglets (64 from each sow treatment) were selected based on their source litter and initial BW, and randomly assigned to 2 treatments (control or LY) at 4 pigs per pen (total of 32 pigs per treatment) for a 6-wk growth performance study. At the end of the growth performance trial, 2 barrows from each pen were moved to metabolism crates for total fecal collection for a digestibility trial. Addition of LY to the sow diets had no effects on birth weight, weaning weight, litter size at birth and mortality. Piglets had greater body weight (BW) on d 21 and 42 postweaning when sows were fed diets supplemented with LY, and overall average daily gain (ADG) was greater in piglets from sows that received LY (P < 0.05). There was no effect of sow and nursery diets on overall average daily feed intake (ADFI) and gain : feed intake (G:F). Supplementing diets with LY during the nursery phase increased apparent total tract digestibility (ATTD) of dry matter (DM), gross energy (GE) and phosphorus (P) during this phase. The ATTD of GE was also greater in piglets from sows that received LY. In conclusion, LY supplementation of diets during gestation and lactation and during the nursery phase could increase ADG and ATTD of DM, GE and P in the offspring, and this may lead to a greater lifetime growth performance in the offspring.