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'High-ranking cows with genomic information' Menu
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Please select a report from the 'High-ranking cows with genomic information' Menu. High-Ranking Cows with Genomic Information By Duane Norman, George Wiggans, and Paul VanRaden The dairy industry has expressed concern that the April 2010 adjustment to improve accuracy of predicted transmitting abilities (PTAs) of Holstein and Jersey cows with genomic information (reported or imputed) decreased yield PTAs for those cows compared with other cows. The adjustment makes evaluations of genotyped males and females comparable, thus improving the contribution of cow information to genomic evaluations. The subsequent average gain in reliability of yield evaluations for young bulls was 3 percentage units for Holsteins and 9 percentage units for Jerseys. Comparability of PTAs among cows might be improved further by decreasing heritability of yield traits or applying adjustments to all cows, and additional research is ongoing. More cows are being genotyped, especially those of interest as bull dams, and the demand for PTAs of genotyped females is increasing. This list of the top cows (registered and grade) with genomic information (reported or imputed genotype) for net merit now is provided for Brown Swiss, Holsteins, Red and White, and Jerseys. All cows included on the list met screening requirements for elite or high-ranking grade status. | |