I live in a suburb of Chicago and my birds range in our yard on average of 6 hours a day. They have access to water, layer feed (organic) (not that that matters) and have free choice grit and oyster shells. They also get some kitchen scraps and some scratch once in awhile.
I have 1 delaware, 2 Black Australorps and 1 EE. abot 22 weeks old. Obviously I want them to lay, but was just curious if anyone has heard of any studies on this topic. Regardless, mine will range in yard as much as I can let them. They are the best thing to watch etc...