Long Day Breeders File

The melatonin signal acts on high-affinity MT1 receptors in the of the anterior pituitary. In LDBs, a short melatonin signal (long days) triggers the PT to increase expression of thyrotropin (TSH) . Locally produced TSH acts on TSH receptors in the hypothalamus, specifically on tanycytes lining the third ventricle.

Among the most fascinating of these biological rhythms is the strategy of the . These are animals that have evolved to synchronize their reproductive cycles with the longest days of the year, typically spring and early summer. long day breeders