The medical programme is led by Dr. Fernand Marien from Tielen (Belgium) and according to the Koehoorn brothers quite simple. The brothers try to minimize the amount of curing and medical treatment is only given if advised by Dr. Fernand Marien. The pigeonries are proper and are cleaned at least twice a day. 'The less one's got to do to his loft, the better the season', is Sanders motto.
Pigeons that fail to keep healthy with this limited amount of medical support will be selected out. The most important criterium for the brothers is 'natural resistance'. In this way it is possible to enjoy your good pigeons for a longer period. Cors advise to beginning or struggling pigeon fanciers is to try and build a loft by natural selection which can stay healthy in a natural way.