Ferro quelatado em rações para fêmeas suínas nas fases de gestação e maternidade e efeitos sobre a suplementação de ferro de leitões lactantes

Abstract

The objective was to evaluate the effects of the supplementation with “on top” chelated Fe in pregnant and lactating swine matrices under the reproductive parameters; concentration of the mineral at the colostrum and milk and it’s implication about the performance and concentration of Fe at the blood of the piglets receiving two kinds of Fe supplementation (intramuscular and oral). 50 hybrid females pregnant of the same breeding at the third reproductive cycle were utilized and separated in two different treatments: feeding with no chelated Fe (n=20) and feeding with chelated Fe (n=30). According to the treatment of the matrices after their births, there was realized the distribution of the 672 generated piglets in five different treatments; females without supplementation and piglets treated with intramuscular dextran iron; females without supplementation and piglets treated with oral administrated iron; females with supplementation and piglets treated with intramuscular dextran iron; females with supplementation and piglets treated with oral administrated iron; females with supplementation and piglets without iron supplementation. Influence of the supplementation of chelated iron about the reproductive parameters in swine matrices was not observed. Although any statistic difference between the weight of the piglets and the litters of supplemented or not supplemented matrices was not observed, the supplementation with intramuscular dextran iron resulted in heavier piglets at weaning, independently of the supplementation with organic iron in the matrices feeding when compared to piglets that were not supplemented with any kind of iron. The concentration of iron at the colostrum and milk of the matrices treated or not with chelated iron was not affect by the treatments, but a bigger concentration of iron at the colostrum comparing to the milk concentration was observed. So we can affirm that the supplementation of “on top” iron at it’s chelated form does not upgrade the reproductive parameters of swine matrices and the supplementation of the piglets after the birth is necessary.