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Journal of Animal Science Abstract - Animal Genetics

Genomic selection in the German Landrace population of the Bavarian herdbook1

 

This article in JAS

  1. Vol. 94 No. 11, p. 4549-4557
     
    Received: Apr 27, 2016
    Accepted: Sept 02, 2016
    Published: October 27, 2016


    2 Corresponding author(s): mgertz@tierzucht.uni-kiel.de
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doi:10.2527/jas.2016-0581
  1. M. Gertz 2*,
  2. C. Edel,
  3. I. Ruß,
  4. J. Dodenhoff,
  5. K.-U. Götz and
  6. G. Thaller*
  1. * Institute of Animal Breeding and Husbandry, Kiel University, 24098 Kiel, Germany
     Institute of Animal Breeding, Bavarian State Research Centre for Agriculture, 85586 Poing, Germany
     Tierzuchtforschung e.V., 85586 München, Germany

Abstract

The aim of our study was to compare different validation methods with respect to their impact on validation results and to evaluate the feasibility of genomic selection in the German Landrace population of the Bavarian herdbook. For this purpose, a sample of 337 boars and 1,676 sows was genotyped with the Illumina PorcineSNP60 BeadChip. Conventional BLUP breeding values for fertility, growth, carcass, and quality traits were deregressed and used as phenotypes in genomic BLUP. The resulting genomic breeding values were also blended with information from the full conventional breeding value estimation to include information from nongenotyped parents. Subsequent validation used forward prediction, realized reliabilities, and theoretical reliabilities. The results indicate that the validation methods showed a relatively large effect on in the displayed reliability levels in our study: forward prediction reliabilities were found to be much lower than the conventional parent-average reliabilities whereas corresponding realized and theoretical reliabilities were found substantially greater. Theoretical reliabilities appear to be the most consistent validation approach tested in our study, because they avoid the use of proxy variables. Generally, our results suggest a substantial potential for a genomic selection implementation for the Bavarian herdbook by using both sows and boars. Theoretical genomic reliabilities of direct genomic values of selection candidates were, on average, 31 to 36% greater than the conventional parent average reliabilities. However, the inclusion of residual information from conventional breeding values had only a marginal effect on reliabilities.

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