I used Purina Flock Raiser (20% protein) and left them with food 24/7. They are lazy birds, but even one of the hens did a funny little hop/fly thing the other day LOL
I really liked doing these in the winter - being in Fl it's not that cold - as apposed to the summer when I think the heat, flies and smell would have been really bad.
I won't do meaties in summer here in South Florida.. As much as I want to. Too hot and wet, not conducive to happy, healthy chicks.. plus it gives their pasture area a rest til fall, when it cools off and dries up..