We have thought about the testicles freezing but the bulls are in the same area that they have been for 40 years. As many as 50 have been in this pasture. Fed daily, good hay/pasture/free choice mineral. Vet is out routinely at least twice a year. Preg testing, vaccines, etc. Testing was done when we aquired the bulls and then after the issue occurred. Different Bulls for different cows/heifers. Red Angus..they are not put in the same areas. Bulls can't get together to fight. We put 2 hereford Bulls in for the Spring cows we have currently. But we want to go back to our Angus. Cows herd is 70% red Angus, 20% black Angus, and 10% are mixed. Genetics may have played a part? The bulls that went bad were from the same farm. We are purchasing a black and red Angus bull from different lines. Just was seeing what everybody else thought. We are switching mineral to Purina and feed also. Plus we put our Avail4 tubs yesterday to hopefully increase sperm production. Just think I am missing part of the equation. We are not new to raising cattle. We keep a herd of about 300 black/red Angus at another farm and have no problems there. I appreciate all comments and am not insulted. This herd is a starter herd for a friend and trying to help him out.