Final answer:
Prolactin is the lactogenic hormone secreted by the pituitary gland that stimulates milk production, and oxytocin is the hormone from the posterior pituitary responsible for uterine contractions and the let-down reflex.
Step-by-step explanation:
The lactogenic hormone secreted by the anterior pituitary gland of lactating women is known as prolactin (PRL). Prolactin is responsible for the stimulation of milk production by the mammary glands following childbirth. The regulation of prolactin levels is influenced by hypothalamic hormones, specifically prolactin-releasing hormone (PRH) which stimulates prolactin release, and prolactin-inhibiting hormone (PIH), which is dopamine that inhibits it.
The pituitary hormone responsible for uterine contraction and the let-down reflex is oxytocin. This hormone, secreted by the posterior pituitary, plays a crucial role during childbirth by stimulating uterine contractions, and following birth, it aids in milk ejection from the breasts in response to suckling. Oxytocin's release is part of a positive feedback mechanism which increases the intensity of the uterine contractions until childbirth is completed.