Heterosis in preweaning traits in swine

  • José Bento Sterman Ferraz Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, São Paulo, SP
  • Francisco Alberto de Moura Duarte Universidade de São Paulo, Faculdade de Medicina de Ribeirão Preto, Ribeirão Preto, SP
Keywords: Breeding of swine, Genetic (heterosis)

Abstract

Individual weights at birth (PO), 21 days(P21) and weaning (PD) of 746 piglets, being 201Landrace, 136 Wessex-Saddleback and 409 crossbred were analysed by the least squares method. Estimates of heterosis and weight gains were obtained by a fixed model considering the effects of year and season at birth, litter order, sex and litter sizes, besides paternal and maternal breed effects. The effects were significant and the crossbred piglets were heavier than purebreds. Heterosis estimates were 2.6% for PO, 9.7% for P21 and 13.9% for PD, indicating higher no additive gene effects when the age of piglets increase or their dependence on maternal hability becomes less important. Interactions between maternal and paternal breeds were significant. The results indicate that crossbreeding these two breeds is useful for piglets production.

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Published
1991-12-02
How to Cite
Ferraz, J. B., & Duarte, F. A. de. (1991). Heterosis in preweaning traits in swine. Brazilian Journal of Veterinary Research and Animal Science, 28(2), 235-242. https://doi.org/10.11606/issn.1678-4456.bjvras.1991.51943
Section
ZOOTECHNICS