Implementation of Multiple traits Multi Lactation Random Regression Test Day Model for Production Traits in Australia

Authors

  • Kon Konstantinov ADHIS

Keywords:

random regression, multi-trait, de-regression, Australia

Abstract

Genetic evaluation of dairy cattle using random regression test-day models is now common internationally. In Australia a multiple-trait multi-lactation test day model (MTMLTD) was introduced. Legendre polynomials of second order were used to model the genetic and permanent co-variance structure throughout the lactation trajectory. This paper described the results from the implementation of the major components of the Australian test-day model including, co-variance components estimation, reliability calculations, adjustments for herd-year-season variance heterogeneity and simultaneous de-regression of cow’s and bull’s EBVs to be used in the genomic analyses.

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Published

2015-08-25

Issue

No. 49 (2015): Proceedings of the 2015 Interbull Meeting

Section

Articles

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