The Cornish Cross meat birds are all feathered out at 4 weeks old, and gaining weight rapidly. They eat heartily, and are drinking loads of water. I feed and water them several times per day, and plan to keep track of the costs since this is our first time raising meat birds. Because it's cold (in the 30's) we keep a light on at all times for warmth. Temporarily we put up a two sided tarp for wind protection, until we get the 3 sided lightweight shelter built.