- Effects of preventing periparturient hypocalcemia in cows by parathyroid hormone administration on hematology, conglutinin, immunoglobulin, and shedding of Staphylococcus aureus in milk. Kehrli, M.E., Goff, J.P., Harp, J.A., Thurston, J.R., Norcross, N.L. J. Dairy Sci. (1990)