It's your entirely your business what you do with your chickens,
of course, but you must know it is
not advised to taint the bloodline of these very special appellation chickens by cross-breeding them out of breed, which is one of the reasons the French wouldn't allow us to import them to begin with, as I understand it. I believe it was GreenFire Farms who first imported them to the U.S. and went to a great deal of trouble and expense to do so. I'm brand new here and have
zero desire to offend anyone, just saying it'd be a terrible shame to destroy the 500 year old super-pure bloodline of these incredibly special and highly sought-after chickens.
These birds are considered the Kobe Beef of chickens. They require special feeding techniques and if you're raising for meat, their feed must be changed around 4 months for hens and 8 months for capons, and dairy products and grains given; plus their foraging and activity is greatly restricted until butchering time. Articles I've seen say this breed metabolizes their feed differently than other chickens, which has a lot to do with the flavor of their meat. Their meat is highly marbled like steak is, superbly juicy and tender meat unlike any other, from all reports. I haven't been fortunate enough to eat one yet although I've read many articles on them. In Paris butcher shops, a Poulet de Bresse capon goes for upwards of $100 each, they leave their blue legs on to prove they are indeed the prized Poulet de Bresse. Legendary French Chef Brillat-Savarin even wrote about them specifically as being the "Queen of Chickens and the chicken of Kings".
Here's a link for you to GreenFire Farms talking about the Bresse:
http://greenfirefarms.com/store/category/chickens/american-bresse/
Again, not looking to be offensive to anyone, just trying to engender the deep respect & consideration for maintaining the breed purity it clearly deserves.