Between heritage breeds and commercial/modern strains? I have read over and over people making remarks about heritage breed's better ability when it comes to foraging, but I'm unable to find any hard data. I'm particularly interested in learning if the amount of food heritage breeds get from forage makes up for the fact that most don't lay as well as the commercial strains. I like heritage breeds, and I'd like to do a comparison study myself, but, alas I'm already slightly over the number of chickens I'm allowed to have at 5. If anyone knows of such a study, or can point me in the correct direction I'd very much appreciate it.