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Antibiotics in Milk from Farms

Department of Dairy Science, The Pennsylvania State University, University Park

ABSTRACT

When the mammary glands of dairy cows are treated with antibiotic preparations in an effort to control or eliminate infections, the milk from such udders will contain objectionable quantities of these drugs for several milkings (1, 2, 3, 10, 14). The amounts present, of course, will vary with the concentration and kind of antibiotic introduced, the carrier or vehicle employed in the preparation, the amount of milk drawn from the gland, and the time interval between treatment and milking (1, 3). The milk may appear normal in every respect to the producer but the small amounts of antibiotic or antibiotics present, even when diluted with milk from untreated cows, are very often sufficient to cause trouble in the dairy plant receiving the milk (3) They may also be sufficient to cause undesirable effects in milk consumers who are particularly sensitive to these drugs (14). Furthermore, suspicions are being aroused that products made from milk containing antibiotics may contain infectious organisms that are antibiotic resistant and if implanted in human tissues are difficult for physicians to treat (6, 12).