i have to agree some people use medications willy nilly even used baytrill once myself with good effect if your getting respirity disease its down to the loft design and too many pigeons , if your birds ail too often they wouldnt be of any use to me as they wouldnt survive long enough to see medication , nature suppresses the week and unfit birds be it through bad management or natural causes , it has to be survival of the fittest and fastest , birds with a week constitution will ail and will weaken any loft till there removal