Cow country and academia will agree, however, that fertility is the most important trait to be considered in a breeding program.
Practical experience shows it, and statistics prove it.
The first thing you've got to do is get those cows bred. This is adequate justification to place much greater emphasis on the fertility of the bull. Encouraging producers to strive for fertility first, Coulter recommends a yearly breeding soundness evaluation for every bull. While Coulter calls each factor of equal importance to normal fertility, much attention has been focused on testicular and scrotal development. In particular, testicular size and weight, and thus the amount of potential sperm-producing tissue, can be estimated through the use of scrotal circumference measurements.