So, select first and correctively mate second. For many herds, the answer to this question is yes. The following benefits can and frequently do arise. There is a plan. This could avoid the problem of breeding cows to potentially inferior bulls if other farm chores overwhelm the breeding program.
Dairymen can achieve the same benefit by selecting bulls themselves and preparing a list of matings.
Evaluators can avoid matings between sires and cows with similar major weaknesses. Evaluators may have more knowledge of such weaknesses than some dairymen and can also deal with traits where an intermediate value is desirable. Rear leg set is an example. Evaluators can frequently avoid the frustration of trying to use bulls in short semen supply. Management tips are often offered by evaluators.