Udders with swollen quarters should be examined for mastitis. Number of Infusions Research to date indicates there is little, if any, value in treating cows at drying off and again two or three weeks later. Subsequent treatments may pose the additional risk of forcing bacteria into the gland and increase the risk of antibiotics in milk after freshening. Preventing Drug Residues Attention must be given to preventing drug residues in milk and meat. Label directions must be followed exactly to avoid drug residues after freshening, especially when cows have shorter than normal dry periods.
Tests are available to determine antibiotic residues in milk.
Most dairy cooperatives, cheese plants, and many veterinary clinics will run these tests or you can buy your own kit. If a question arises concerning whether or not milk may contain antibiotics, a test should be conducted. Producers are encouraged to use the Milk and Dairy Beef Quality Assurance Program to conduct a self-evaluation of their operation with their veterinarian. The risk of new intramammary infection is greatest during the early and latter portions of the dry period. Because udders are not milked during these times, pathogens are not flushed out of the lower portion of the teat canal.