I have 8, 5 month old black sex link roosters that came with my buff orpington order. Its time to get them out of the yard. I have butchered chickens (among other animals)Long ago and the only thing not coming back to me is how hot the water for scalding. I will be using my propane powered turkey fryer and there is a fairly accurate thermometer. I'm thinking I do not want it to be boiling but there must be an optimum temp? Any ideas?