Recombinant porcine somatotropin for sows during late gestation and throughout lactation.

摘要: Two experiments were conducted to evaluate whether administration of recombinant porcine somatotropin (pST) sows (Hampshire-Yorkshire) enhanced lactational performance. In Exp. 1, (n = 84) fed a corn-soybean meal diet (17.8% CP), or similar with 8% added fat, from d 108 gestation 28 lactation. Half the each injected 6 mg/d pST 24 Diets at 2.27 kg/d until farrowing and then self-fed during By 3 lactation, litter size was standardized 8 10 pigs per litter. Treating resulted in 10-fold increase (P less than .001) serum 4 h postinjection. Serum glucose increased .01) triglycerides, creatinine, urea N decreased by pST. During summer, apparent heat stress occurred pST-treated sows, resulting 14 deaths. Most (10) deaths just before, during, shortly after farrowing. Fewer .08) when fat. Sows treated consumed feed .10) lost more backfat lactation controls. Increasing dietary fat did not prevent these changes. Weaning weights milk yield (estimated deuterium oxide dilution) affected treatment. 2, 42) weekly 0 70 mg on 3, 10, 17, Litters pigs, same control (low fat) as 1. weight untreated sows. Litter size, average pig weaning weights, influenced These data indicate that 6-mg daily injection prepartum 70-mg postpartum does production lactating