We live on 2 acres. About 1/2 an acre is lawn and the rest is grass, clover, wild carrots, and weeds. We cut it every few weeks so there is always new tender growth for them. My chickens get grower pellets and chicken scratch and BOSS mixed and fermented. They also have a feeder of dry grower pellets free choice. They have free choice grit and oyster shell also. How many birds will be able to free range on my two acres without being crowded? Is there anything else they should be being fed? They are layer birds. Some are a bit over a year old the rest are about 5 months.