Vergleich von zwei Rinderrassen hinsichtlich ihrer Eignung zur Ökologischen Milchproduktion – Teilfrage: TiergesundheitKerstinBarthauthorUlrikeFranzeauthorAccording to the rules of organic farming, prophylaxis shall be supported by selection of appropriate breeds. Nevertheless, today high yielding breeds predominate in organic dairy herds. Since 2004 the Institute of Organic Farming in Trenthorst compares two breeds under the same management conditions on its experimental farm. The evaluation of the data gained between March 2006 and March 2008 revealed a higher treatment rate in the milk orientated Holstein-Friesian cows compared to the German Red Pied, a local dual purpose breed. Although treatment of claw disorders were much more frequent in Holstein-Friesian cows, the lameness scoring carried out every fortnight did not show any difference between the two breeds (Chi2 3=3.506, n. s.). In 24 of 134 cases, cows needed support during calving but the frequency did not differ between the groups (Chi2 2=0.125, n. s.). Due to the low cell frequency the reasons for culling could not be evaluated, yet. Even if a comparison of breeds has to take into account the genotype-environment-interactions, these first results show no clear advantage of an assumed robust breed under the conditions of our organic farm. Health and welfare Breeding and genetics2009Conference paper, poster, etc.