Utah State University Extension
Very few bulls are “sterile” and unable to produce any offspring. But, 10% to 25% of bulls have reduced fertility or possess physical problems which reduce their ability to sire calves. The breeding soundness evaluation (BSE) is a useful tool in identifying these bulls. Eliminating bulls with physical problems or reduced fertility from the breeding herd will improve overall reproductive efficiency of the herd.
Bagley, Clell V. and Chapman, C. Kim, "Breeding Soundness Evaluation of Bulls" (2005). All Current Publications. Paper 1300.