Selection of the fittest, it is the law of Mother Nature. We all select the very best individuals to reproduce the next generation since they have the better qualities for efficiency and therefore more food on one's table. Be it cows, sheep, pigs, turkeys, chickens, etc. Man has done this type of selection for thausands of years. Some types of chicken are reproduced by the Billions , and some by the thausands, and others just a few individuals. It takes a little more effort to reproduce those billions with their efficiency of converting raw resources, but the rewards in edible protein is well worth it. If one chooses the latter group, one will sooner or later find oneself using up more and more valuable resources and still get the same old return of protein on one's table. So, which ones go on to nourish the hungry of this world ?