I am feeding my chicks (10wks) purina Start 'n Grow, but 25lbs doesn't last long at all, now! Will it hurt to switch them to Neutrena chick feed? I can get it in 50lb bags. From everything I've read, I'm to keep them on the chick food until they get laying age because of the calcium in the laying crumbles. That means I have about 14 wks to go and there are 12 of them...EEs and Black Stars. Wow, can they eat!