What you want to be careful of is spoiling your snake, feed them chicken too often, and they may start refusing other prey items, ie. rats/mice. Or you end up having to dip the rats in chicken broth to get the snake to eat them. I'm not sure about BPs, but with burms, chicken was the last resort if one was off feed. Personally, I wouldn't feed chicken more than once every 2 or 3 months. Keep in mind, all this is my completely unscientific opinion, other people may have better info than I.