how old do they typically need to be before they can make good use of fodder?I think most folks feed a portion of commercial feed in addition to fodder. My adult birds get commercial feed, poultry wheat, a special bread that I make for them, and fodder. The babies get only commercial feed because their gizzards need to work up to being able to handle food that takes more effort to digest. If I had a better feed mill I'd formulate the grains/nutrients myself and grind it up, but it's slim pickings in my area.