Are billies very prone to being sterile? I have 9 does with a young billy (Buster). He is a pure bred boer about 7 months old. He does not smell much, no signs of agression. I have never seen him go after the does. He does not show any sign of interest. The does do not seem to be coming into heat yet either though. I can not tell if the goats are pregnant already. Is Buster to young to breed? Maybe he just does not want the responsibilities of having kids at such a young age.