PTA is the prediction of an animal's potential to transmit yield productivity to its offspring. The term PTA will be used for genetic evaluations of both bulls and cows. PPA will be useful for making herd replacement decisions. The method for computing REL results in REL values that will be higher than Repeatability in most cases because the REL includes a pedigree contribution.
Adjustment is made for genetic merit of an animal's mates.
Cows are compared more precisely with herdmates under similar management conditions.