well ybs can be kept either natural or darkness , natural as in left to moult naturaly , darkness where the moult is forced as this seems to improve ybs performance and are in better feather than the naturals who will shed there flytes and the darkness birds will hold them giving them better feather and a fuller wing you can race in a few ways also : widowhood ( cocks raced only ) roundabout both sexes raced but seperated like the widowhood but two similar lofts , and last but not least natural where birds will be prepaired to the nest of there liking be it eggs , eggs chiping , new chipped yb , 6/7 day old yb or a big yb ectra or even dummy eggs or a floated yb ticking egg adding ectra eggs and so on descripton minimal , normaly room for loft and available time dictates how you will fly / keep your birds