Simultaneous deregression of cow and bull breeding values

Authors

  • Mario Calus Animal Breeding and Genomics Centre, Wageningen UR Livestock Research
  • Ghyslaine Schopen CRV BV
  • Roel Veerkamp Animal Breeding and Genomics Centre, Wageningen UR Livestock Research

Keywords:

Deregression, reference population, cows

Abstract

The next step to increase the accuracy of genomic prediction is to extend reference populations with cows next to daughter proven bulls. Cows typically have estimated breeding values (EBV) with considerably lower reliabilities compared to bulls. This suggests that commonly used (approximate) deregression procedures for bulls may not be appropriate for cows. The objective of this study was to test an alternative approach to simultaneously de-regress EBV of cows and bulls, and to derive appropriate weights for those de-regressed EBV. First, the appropriate weights of the de-regressed EBV were derived, and then the de-regressed EBV were computed using those weights. The analyses showed that the methods were well able to accurately de-regress EBV and compute their weights, both for bulls and cows. Despite observed discrepancies between intermediate results and simulated values, final EBV and reliabilities correlated very well with original values.

Deregression, reference population, cows

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Published

2014-06-22

Issue

No. 48 (2014): Proceedings of the 2014 Interbull Meeting

Section

Articles

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