For this chicken stock, I buy "Smart Chicken" brand of chicken, usually legs, that is free range, no hormones, no antibiotics, no MSG, no nothing. If you find this brand too pricey(and it is), I recommend "Pilgrim's Pride;" it has no hormones or antibiotics and it is about 1/2 the price of the "Smart Chicken" in my neck of the woods(NE Okla).
http://www.cooksillustrated.com/recipes/detail.asp?docid=5164
Bon Appetit!
http://www.cooksillustrated.com/recipes/detail.asp?docid=5164
Bon Appetit!