First post so be kind. I raised about 1500 meat birds(cornish X) this year(last flock now). I have read and watched all I could about this critters trying to understand them. Most of my info has come from here or reading and watching Salatin. I use his pen style and techniques. We live in a similar area of the country as he. My problem is I cant get my birds to grow. It takes me 9-10 weeks to get them to 5-6 lbs. I am feeding them a 20% protein non antibiotic or steroid feed from southern states after they get a 22% starter for a couple weeks. I follow a feed chart that gives them about 15 lb per bird for 8 weeks. We leave them in a brooder then move them to the pasture at about 4 weeks. They get fresh water and grass regularly. I was told recently that I should be giving grit, which I wasn't until now. This could be the problem?? Any other thoughts on why my gain is so bad would be appreciated.