If the adjustment of cows is needed, why was it only done to genomically tested cows?
The undesirable consequence of the adjustment is that non-genotyped cows are not fully comparable with genotyped ones. It may be useful to think of this as though genotyped cows have been converted to have evaluations comparable with those of bulls, and non-genotyped cows have evaluations that are the same as they have always been. There is a new link on the AIPL website that ranks only genotyped cows by $NM. A research project showed that a similar result can be achieved for all cows by lowering the heritability of the yield traits. The industry did not approve the change to heritability, so the focus moved to fixing those animals that are contributing to the genomic equations. However, not being able to compare genotyped and non-genotyped cows is leading us to reconsider implementing the change in heritability.
