Mastitis is most often associated with disease of the udder recognized as either subclinical or clinical disease resulting in reduced milk production and potentially a sick cow.

Veal calves comprise approximately 0.25 percent of total red meat production in the U.S., yet they account for nearly 25 percent of the positive tissue residue tests. Similarly, market dairy cows represent 7.7 percent of total beef production but account for more than 66 percent of total tissue residues.