I bought a 5 lb bag of flockraiser crumbles to start my goslings, but now I've been mowing strips of our lawn for grass supplement. They are 2 weeks old. They can go through a 2 gallon bucket of grass clippings a day. I probably have a week left the flockraiser, but can I just start feeding them grass full time? They get niacin supplements in their water. They also spend at least 2 hours a day free ranging.