I completely disagree with pre-bagged feeding method.
If you have ever actually studied or watch chickens, they are browser/grazer animals. My month old chicks refused to stay in their box at 2 weeks old and instead grazed around my house all day long instead. Pecking at everything, including roosting on my 90# lab and pecking anything off him (he's a saint.)
My outdoor hens have complete free range, I do offer then organic, soy free pellets, but a 50# bag lasts me...6 months? 8 months? They only touched it in the middle of winter.
Otherwise my hens eat what's in the yard, scraps, and a seed mix I spraay around. They are 100% healthy, healthy weight, no health issues at all. And so happy, they are doing what chickens should do.