We have a seven month old colt, see avitar. He's looking like he'll be a nice stocky horse for working cows and such (huge hip, neck and WIDE chest with short back!) He's a grade paint (DH has a vendetta with papers lol) so studing him out isn't realistic. Anyway I digress. We want him to bulk out as much as he can but want to casterate him so he doesn't breed back his dam... they will be in the same pasture once he's finished being weaned. So what would be a good time to utilize the growth from his testosterone yet take care of things before the enevitable of leaving him intact?