Newborn calves from dams free of
staphyloccocal udder infection were
assigned to treatment groups in two
experiments. Following colostrum feeding for 2 days, a culture of Staphylococcus aureus was added to pasteurized
milk fed to one group twice weekly for a
total of nine feedings. A control group
received only pasteurized milk. Bull
calves were in a short experiment to
determine whether the organism was
established in body tissues, and a second
experiment was to determine the effect
on incidence of mastiffs at calving.