The use of antimicrobial drugs and the subsequent selection for antibiotic-resistant bacteria is a global health problem affecting humans, animals and the environment. A research team from Vetmeduni Vienna has examined a possible factor influencing this problem in more detail, namely the feeding of waste milk – milk that does not meet the legal requirements for human consumption – to calves. The researchers argue that more attention should be paid to the possible negative consequences of this feeding practice and that alternative strategies must be explored.