As half of my chicks are now looking like cockerels, if they get too agressive by fall they'll be culled. I think I only have 4-6 pullets, one definite leader cockerel... who's not mean. Will I need to try at another batch of sexed pullet chicks, so I can have some decent sized chicks to add to the bunch b4 winter? Or will that small amt. be able to keep each other warm? BTW... i'm in Northern MI. Pretty darn cold up here. TIA!