We are raising our own meat birds this year, a slow growing heritage breed called Dark Cornish. The roosters are currently 5 months old and weight 6 pounds. Optimum weight is 10 pounds and we have an appointment to have them processed at the beginning of November. I was hoping for suggestions on how to bulk these guys up. They free range and are mixed in with my layers. There is no good way to separate them to offer a separate food source. So, can everybody in the flock get broiler feed for the next 2 month or will it hurt my layers?