Small ruminant research vol:5 issue:4 pages:347-355
In order to examine postpartum (pp) changes of concentrations of thyroid stimulating hormone (TSH), thyroxine (T4), triiodothyronine (T3), reverse triiodothyronine (rT3), growth hormone (GH) and cortisol (C) in newborn lambs, blood samples were taken at birth, 1, 2, and 4 h pp. Plasma TSH and T4 remained unchanged during this early postnatal period. A significant increase of T3 was observed at 1 h pp, while a continuous decrease in rT3 and GH was found during the 4-period. C decreased sharply at 1 h pp and remained stable from 1 to 4 h pp. Rectal temperatures (rt) were increased significantly (P < 0.005) at 1 h pp and did not change during the following 3 h.