Ok, so I hatched 50 of my own eggs a few months ago ( the oldest are 12 weeks, youngest are 6 weeks). They are standard mixed-- EE, Black Giants, Minorcas, leghorns, buffs--I am not exactly sure which are pullers and which are roos, but I am certain I will need to kill several Roos ( 50% ehh)--my question is- how can I tell they are roosters and when is the best time to kill them for meat? If I wait till they crow--so I can be sure they are roosters--will they already be tough?