In my opinion, i put my youngsters on the darkness to be competitive for young bird racing, which means they go the whole programme, if i was in the practice of stopping any, i would have changed my plans before breeding my young birds and kept them on the natural, and only stopped them when theyr'e heavy in the body. Im a believer in young birds winners tomorrows dinners. so on the darkness even birds that ive won with, and scored well with will go the whole programme.