Feeding non-salable milk from antibiotic-treated cows to calves is a common practice. Now, the presence of antimicrobial residues in waste milk raises significant concerns within the scientific community. Researchers assert that waste milk’s use poses a risk by exerting selective pressure, fostering the emergence and spread of resistant bacteria in the intestinal microbiota of calves.
Pasteurization does reduce bacterial loads in waste milk; it does not affect antibiotic residues.”
Source: Dairy Herd Management, September 11, 2024. Link.