The international genetic evaluations for dairy cattle constitute a very complex system which represent a continuous challenge for the scientists involved in this area of research. New countries and new traits are constantly added to the system, making a more accurate and reliable procedure for international bull comparisons needed. A bias that could not be detected by the current validation procedure of input data has been artificially introduced in Italian EBVs having quite a big influence on resulting international proofs: the percentage of Italian bulls in the top 100 international ranking increased by 295% (from 4.8% to 19.73%) which is likely to have a significant impact on the AI industry and bulls semen sales. The current Multiple Across Country Evaluation (MACE) dose not seem to be sufficiently robust to biases in national input data.

Filippo Biscarini, S. Biffani, F. Canavesi

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume , , 01.30, 2006
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