If it was down to to the fancier and his birds health that make up all the losses, surely those who regularly treat their birds and stick to a strict regime will have a loft full of birds, as they dont have many or no losses? Even top fliers experience bad losses and surely they know a pigeons health, unless they just get lucky to be at the top of the sheet each week. Sounds like you follow a treatment regime, did you suffer many losses the last season or 2?