Across country evaluation of animals requires reliable estimates of heterosis and recombination loss, even if crossbred information is weak. Both effects were modelled the same way in the breeding value estimation model; defining one common fixed effect across countries and five country-specific random effects within each country. Estimates for same crosses were similar in each country. Estimates, in % of the phenotypic mean, were at the most 6.7% for heterosis and -4.9% for recombination loss. Corresponding values were 11.6% and -16.7% when all effects were defined as fixed. Defining heterosis and recombination loss as random lead to significant re-ranking between best animals from Denmark, Finland and Sweden.

M. Lidauer, Esa A Mäntysaari, I. Stranden, J. Poso, J. Pedersen, U. S Nielsen, K. Johansson, J. A Eriksson, P. Madsen, G. P Aamand

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 24.02, 2006
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