In the Northeast AI sire evaluation system, bulls are evaluated for milk, fat and protein yields as well as for stayability.
Most producers are familiar with genetic evaluations for milk and component yields and percentages.
Likewise, most producers can explain the concept of predicted difference dollar. Recently, however, little attention has been given to the evaluation of bulls for stayability. Stayability is a trait measured to indicate productive life of a cow. Stayability can and has been defined in many ways. Stayability can be measured from various beginning points, for example, from birth, from breeding, or from first parturition.