n 1985, Norman et al. (6) showed that extendinglactation yields to 305 d for those cows that remainedin the herd but had discontinued milking before 305 dproduced higher heritabilities and repeatabilities forlactation yield than if those records had not beenextended. This finding was the basis for standardiz-ing all lactation records to a length of 305 d for use incalculating US genetic evaluations. However, breedassociations continue to show actual yields onpedigrees as the expression of phenotype. In severalother countries, records terminated at