all depends how you racing them if there on eggs i always get a dummy egg, and go over the local field and catch a grasshopper and put it in, its amazing, how long these things can live in this egg and then never run out of energy, they jump about in the egg constantly making the bird believe its chipping. Another one i do, is if they lay out the week before the race, i add an egg everyday. I also make little dark hideouts with nest bowls in chrisp boxes, feeding the young birds near a keen hen or cocks box, watch them go mad, if you do this every day always a gd motivation. Also if your young birds are tame you can fight them for there perches every day. Or you got the widowhood method.