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This study examined the effect of a bovine colostrum supplementation on growthperformance, feed intake and the hormonal response of piglets at weaning. Ninety-sixnewly-weaned piglets were assigned for four weeks to one of the two treatments: Control(diet with bovine milk whey) and Colostrum (diet with bovine colostrum whey) treatments.The supplements were incorporated in a commercial diet at 20 g/kg during the first 2 weeksafter weaning and lowered to 10 g/kg for the next 2 weeks. Body weight and feed intake weremeasured weekly. Blood samples were taken weekly for determination of circulating IGF-I,its binding proteins and the thyroid hormones (T3 and T4). During the first week of the trial,the Colostrum-fed piglets presented improved growth performance, feed intake and feedefficiency and a higher concentration in circulating IGF-I (+15 %) compared to the Controlpiglets. In both treatments, the circulating thyroid hormones were reduced by weaningand the levels measured at weaning were recovered earlier by the Colostrum-fed pigletscompared to the Control group (P<0.05). It is concluded that hormonal response observedafter the bovine colostrum supplementation is, at least in part, consequent of the positiveaction of bovine colostrum on the feed intake

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Effect of bovine colostrum on the serum insulin-like growth factor-I (IGF-I), the IGF binding proteins-2 and -3 and the thyroid hormones in weaning piglets