Thyroid Hormone Secretion Rates in Growing Jersey Cattle

Thyroid Hormone Synthesis and Secretion

Chapter 2 Thyroid Hormone Synthesis and Secretion

The main function of the thyroid gland is to make hormones, T4 and T3, which are essential for the regulation of metabolic processes throughout the body. As at any factory, effective production depends on three key components adequate raw material, efficient machinery, and appropriate controls. Iodine is the critical raw material, because 65% of T4 weight is iodine. Ingested iodine is absorbed ...

Age Associated Variations in Lymphocytic Growth Hormone Secretion in Cattle*

The lymphocytic growth hormone (GH) and nitric oxide (NO) levels were studied among three different age groups of cattle viz. cyclic adult cows (3-8 years of age), young female calves (2 weeks old) and growing female calves (6 months old). The effects of leptin, sodium nitroprusside (SNP) and N-nitro-L-arginine methyl ester (L-NAME) on the secretion of lymphocytic GH and NO were also studied. L...

Secretion patterns of luteinizing hormone in growing mithuns (Bos frontalis).

To characterize the luteinizing hormone (LH) secretion patterns in growing mithun (Bos frontalis), a semi-wild ruminant, six female mithuns (1 year old; BW: 145.5 kg) were maintained in a semi-intensive system. Plasma progesterone (P(4)) level was measured in twice-a-week samples collected for six weeks to assess ovarian status. This was followed by a frequent sampling period. Blood samples col...

Secretion of parathyroid hormone in patients with medullary thyroid carcinoma.

The secretion of parathyroid hormone (PTH) and calcitonin (CT) was studied in 30 patients with medullary thyroid carcinoma. Most patients with elevated levels of CT were normocalcemic and also had normal basal levels of PTH. Five of six patients with associated hyperparathyroidism were hypercalcemic and had elevated basal PTH levels. Hormone secretion was also studied during infusions with stan...