Genotype by environment interaction was investigated between Brazil and US Holstein populations. Genetic correlations for ME milk and fat yields between countries ranged from .79 to .90. Heterogeneous variances indicate differences among sire breeding values are compressed in low variance herd environments. Correlated response for milk and fat yields in Brazil from sire selection in the US are reduced to 1/2 to 2/3 that observed in the US.

C. N Costa, R. W Blake, E J Pollak, P. A Oltenacu

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 23: Opening: plenary; technology; transfer; beef cattle; dairy cattle; pigs., , 323–326, 1998
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