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Estimation of (co)variance components across breeds by a test-day model adapted to New Zealand dairy cattle

Published online by Cambridge University Press:  23 November 2017

S. Vanderick ,
B. Harris ,
P. Mayeres ,
A. Gillon ,
C. Croquet  and
N. Gengler
S. Vanderick*
Affiliation:
Animal Science Unit, Gembloux Agricultural University, B-5030 Gembloux, Belgium
B. Harris
Affiliation:
Livestock Improvement Corporation, Hamilton, New Zealand
P. Mayeres
Affiliation:
Animal Science Unit, Gembloux Agricultural University, B-5030 Gembloux, Belgium
A. Gillon
Affiliation:
Animal Science Unit, Gembloux Agricultural University, B-5030 Gembloux, Belgium
C. Croquet
Affiliation:
Animal Science Unit, Gembloux Agricultural University, B-5030 Gembloux, Belgium National Fund for Scientific Research, B-1000 Brussels, Belgium
N. Gengler
Affiliation:
Animal Science Unit, Gembloux Agricultural University, B-5030 Gembloux, Belgium National Fund for Scientific Research, B-1000 Brussels, Belgium
*
Email: [email protected]
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Extract

In New Zealand, crossbreeding is largely used by dairy farmers. Currently an important proportion of cows are crossbreds, mostly Holstein-Friesians (HF) x Jersey (JE). Crossbred bulls are currently being progeny tested in New Zealand. Actually, more than one third of the replacement dairy heifers are crossbred animals (Montgomerie, 2002). However currently available methods to model genetic contributions of purebreds to crossbreds take breed differences only partly into account and therefore do not permit an optimal use of crossbred data. The first objective of our study was to allow the modelling of different additive breeding values according to parental breeds to define overall additive breeding values as a function of breed composition.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2005 , 2005 , pp. 114
Copyright
Copyright © The British Society of Animal Science 2005

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References

Montgomerie, W. A. 2002. Experiences with dairy cattle crossbreeding in New Zealand. Paper prepared for the 53rd Annual Meeting of the European Association for Animal Production , Cairo, 1-4 September 2002. pp 1–12. Available on http://www.aeu.org.nz/news/EAAP_Xbreed_Sept2002.PDF (consulted in June 2004).Google Scholar