HI! My chickens are 9 weeks old. At what point to I not offer feed around the clock, and when do I just feed in the morning, and how much per bird? They are in the coop/run full time, and also get several hours a day free range time. I have 25, a mixed flock of Rhode Island Reds, Barred Rocks, Buff Rocks & Silver Laced Wyandottes. Thanks!