Thyroid hormone levels in Rathi calves

An investigation was carried out to determine thyroid hormone levels in Rathi calves of both the sexes. The animals were selected from farmers' stock of semi arid and arid tract. Serum hormone levels included thyroxine, triiodothyronine and calcitonin. The overall mean±SE values were 6.12±1.01μg/dl, 130.11±13.01ng/dl and 116.32±9.2pg/ml, respectively. The mean values of thyroxine and triiodothyronine decreased while of calcitonin increased significantly (P≤0.05) with advancement of age. The effect of sex was significant (p>0.05) on serum hormone levels, values being higher in female animals.