Slice sausage into 1/2 inch pieces. In large stockpot combine the chicken, sausage, onion, butter, seasonings and bay leaves. Add the chicken stock and bring to boil, cover and cook on low boil for 40 minutes. Remove the chicken from the pot and let cool slightly. Pick the meat from the bones, discard bones and skin. Add the rice to the pot and bring to a boil stirring well. Boil for 10 minutes, reduce heat, cover pot and swimmer for 10 minutes or until rice is done. Remove bay leaves and return chicken to the pot. Stir well and serve.