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Response and Inbreeding from a Genomic Selection Experiment in Layer Chickens
Genetics Selection Evolution
  • Anna Wolc, Iowa State University
  • Honghua Zhao, Iowa State University
  • Jesus Arango, Hy-Line International
  • Petek Settar, Hy-Line International
  • Janet E. Fulton, Hy-Line International
  • Neil P. O'Sullivan, Hy-Line International
  • Rudolf Preisinger, Lohmann Tierzucht GmbH
  • Christine Stricker, agn Genetics GmbH
  • David Habier, Iowa State University
  • Rohan L Fernando, Iowa State University
  • Dorian J. Garrick, Iowa State University
  • Susan J. Lamont, Iowa State University
  • Jack C. Dekkers, Iowa State University
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Genomic selection (GS) using estimated breeding values (GS-EBV) based on dense marker data is a promising approach for genetic improvement. A simulation study was undertaken to illustrate the opportunities offered by GS for designing breeding programs. It consisted of a selection program for a sex-limited trait in layer chickens, which was developed by deterministic predictions under different scenarios. Later, one of the possible schemes was implemented in a real population of layer chicken. In the simulation, the aim was to double the response to selection per year by reducing the generation interval by 50 %, while maintaining the same rate of inbreeding per year. We found that GS with retraining could achieve the set objectives while requiring 75 % fewer reared birds and 82 % fewer phenotyped birds per year. A multi-trait GS scenario was subsequently implemented in a real population of brown egg laying hens. The population was split into two sub-lines, one was submitted to conventional phenotypic selection, and one was selected based on genomic prediction. At the end of the 3-year experiment, the two sub-lines were compared for multiple performance traits that are relevant for commercial egg production. Birds that were selected based on genomic prediction outperformed those that were submitted to conventional selection for most of the 16 traits that were included in the index used for selection. However, although the two programs were designed to achieve the same rate of inbreeding per year, the realized inbreeding per year assessed from pedigree was higher in the genomic selected line than in the conventionally selected line. The results demonstrate that GS is a promising alternative to conventional breeding for genetic improvement of layer chickens

This article is from Genetics Selection Evolution 47 (20150: 59, doi:10.1186/s12711-015-0133-5. Posted with permission.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Anna Wolc, et al
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Anna Wolc, Honghua Zhao, Jesus Arango, Petek Settar, et al.. "Response and Inbreeding from a Genomic Selection Experiment in Layer Chickens" Genetics Selection Evolution Vol. 47 (2015) p. 1 - 12
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