When ever I get a late summer or early fall Broody I make sure to stick some of my meat bird project eggs under them because they feather fast get large fast and provide extra heat for the normal sized chicks. Its annoying when chicks do late summer hatches because they end up raising chicks in cold weather. Last Sept I had a Japanese Bantam go broody so I stuck My Red Rangers eggs under her along with the bantam eggs she sat on. Come November the Mama bird was under the meat birds she hatched with the Bantam chicks under mama bird.