Effect of Milking and Ambient Temperature on Thyrotropin Concentration in Serum of Cattle

Abstract
Neither milking nor changes in ambient temperature affected TSH [thyrotropin] concentrations in serum of cattle. Serum PRL [prolactin] concentration increased 10-fold after milking and was positively correlated with ambient temperature. These results do not support the premise that endogenous TRH [thyroliberin] releases both TSH and PRL in cattle.