Bulls developed in feedlot ended up sterile.

My brother was talking about buying a Red Angus bull that ended up being sterile. He said something about 60% of the bulls developed there were sterile. Anybody hear about this........and/or was anything figured out in this deal?

They get them too fat trying to make that "eye-popper".  This restricts thermoregulation in the testicles because of fat deposition and makes them sterile. 

I have clipped a lot of bulls over the years that have been fed in feedlots for production sales. As far as I know there have not been any problems with fertility. The owners I have clipped for always have them fertility tested at the end of the feeding period before I clipped them and only the ones that passed went into the sale.

  Do you happen to know if they were feeding any cotton seed? Gossypol.

Not sure.......interesting.....

There are some interesting articles out there on this subject.......I don't know how to list them.