Abstract
A model is described for utilizing ancestor estimated transmitting abilities from different countries to increase the accuracy of prediction of the performance of young dairy bulls in artificial insemination within a country. The model was applied to young Canadian Holstein bulls having pedigree information from Canada and the United States. Models with varying sources of pedigree information were compared. When sire, dam and maternal grandsire were in the model, the correlations between pedigree index and actual progeny test were 0.64, 0.70 and 0.55 for milk yield, fat yield and fat percentage, respectively. There was little difference in accuracy using a sire and dam model. Average pedigree indices were calculated for bulls in artificial insemination in Canada. The average pedigree index has increased 0.87 BCA (breed class average) per year for milk yield over the last ten years. Key words: Holstein sires, pedigree indexes, production traits
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