I have 7 roosters in a grow out pen. The are currently 9 weeks old. 1 NHR, 2 Black australorps and 4 Barred Rock. I would like to grow them out to about 14 weeks and then send them to freezer camp. What should I feed them? Right now they are still on medicated feed and though they are large I want something to put alittle weight on them. I have never processed birds before so this will be quite the adventure and I hope I can do it.