Which of the following hormones is not transported from the hypothalamus to the pituitary through the hypophyseal portal vein?

From the hypothalamus, ADH and oxytocin are transported through the axons of the hypothalamo-hypophyseal tract to the neurohypophysis.

The releasing hormones and inhibiting hormones secreted by the hypothalamus reach the adenohypophysis through the hypophyseal portal system. These hormones include:

• Gonadotropin-releasing hormone (GnRH)
• Growth hormone-releasing hormone (GHRH) or somatocrinin
• Thyrotropin-releasing hormone (TRH) 
• Corticotropin-releasing hormone (CRH) 
• Prolactin-releasing hormone (PRH) 
• Growth hormone-inhibiting hormone (GHIH) or somatostatin.
• Prolactin-inhibiting hormone (PIH) or dopamine.