Role of genetic markers in the prediction of classification of Czech Large White gilts to a hyperprolific line

Abstract. The objective of statistical evaluation (discriminant analysis) was to find out whether the genetic endowment the gilt was born with is a high-quality discriminator for prediction of its future classification to a hyperprolific line (HPL). Based on the results a conclusion is drawn that the gilt with genotype CC of ESR gene will be classified to HPL in high probability – if the effect of this gene is not reduced by an interaction with other genes. The statistical analysis did not reveal a significant effect of FSHB gene in Czech Large White sows on their future classification to HPL. On the contrary, PRLR gene is a highquality discriminator. Obviously, it is highly probable that the gilt with genotype BB will be classified to HPL. It is to state from the analysis of pairs of the studied genes that the adult gilt with genotype CC of ESR gene and genotype BB of FSHB gene and/or PRLR gene will be classified to HPL in all probability. PRLR gene has a dominant effect in the pair ESR and PRLR. Genotype BB of PRLR gene (the most beneficial of the genotypes from the aspect of future classification of gilts to HPL) markedly increases posterior probability of alleles of ESR gene. If the classification of a gilt to HPL is predicted from the analysis of all three genes, the results of partial analyses are confirmed in most cases. The results of the experiment indicate a possible prediction of gilts on the basis of their genotype for classification to HPL but it cannot be confirmed that the identified »beneficial« genotype will always be expressed in different populations by an increase in reproductive traits.