I would love to get input on the taste and tenderness of birds of different breeds raised for meat. I'm not limiting the possibilities to "meat" breeds. With store bought birds we tend to buy a 4ish lb bird, so I'm not looking to grow 10lb birds. I'm shooting for 3-5 lbs, nutritious, tasty and tender. We do plan on having them in a chicken tractor ASAP and can provide a heat lamp in their outdoor setup. Any advice is appreciated... anecdotes, book suggestions, etc.