Portal de Periódicos da CAPES

International Genomic Cooperation - North American Perspective

2010; Interbull Centre; Issue: 41 Linguagem: Inglês

1011-6079

Betsy Muir, Brian Van Doormaal, G.J. Kistemaker,

Genetics and Plant Breeding

Centers in USA and Canada (AIPL-USDA, Animal Research Services, Beltsville, Maryland and the Canadian Dairy Network, Guelph, Ontario) have been sharing genotypes in order to enhance genomic evaluation procedures in both countries. Although genotypes and genomic methodology are shared, no direct comparison has been made between genomic breeding values published on the two country scales. January 2010 official proofs, direct genomic values and traditional EBV (termed PTA in USA) from both countries were compared. In general, genomic parent averages for young bulls were more correlated across countries than parent averages using traditional evaluations only. However, for LPI / Net Merit and Conformation, correlations across countries for first crop bulls and cows were stronger for traditional breeding values than for genomic breeding values. Accuracy of predicting future proofs was greater when all North American bulls were included in the SNP estimation, compared to only having domestic bull proofs available, with both countries realizing similar levels of accuracy. Gain in published reliability with inclusion of genomic information was greatest for young bulls and heifers evaluated in the USA, but this is also a function of differing methods used rather than differing levels of accuracy achieved with genomics. Proven bulls gained more published reliability in their second country of proof since the traditional EBV in that country would be a MACE evaluation of lower reliability so more gain is possible through genomics. This report summarizes the current benefits of collaboration in North America and challenges still to face.