Fertility has the greatest impact on the profitability of beef production. Fertile herds produce more live calves for sale.
Dr. Gary Minish, Virginia State University and Dr. Danny Fox, Beef Cattle Research, Cornell University, New York stated in their book Beef Cattle Production & Management:
The return in dollars from calves weaned is twice as much as that from growth rate and 20 times as much as that from carcase merit.
Female selection should heavily stress reproductive efficiency.
The most important rating a herd sire can receive is that of high fertility.