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The hormones of the adrenal cortex play an important role in lactogenesis in several species and adrenocorticotrophin (ACTH) is generally regarded as an essential component of the lactogenic complex of the anterior pituitary (see reviews by Folley, 1952, 1956, 1961; Cowie, 1966). The observations that cortisol acetate or ACTH will induce lactation in the rabbit whose mammary glands are suitably developed (Talwalker, Nicoll & Meites, 1961; Chadwick & Folley, 1962) would appear to agree with this concept of the important role of the adrenal cortex in lactogenesis in this species. Recently, however, Kilpatrick, Armstrong & Greep (1964) have reported that prolactin alone will induce a lactogenic response in the hypophysectomized pseudopregnant rabbit; that is, in circumstances when the level of corticosteroids in the body must be low. It is therefore of interest to test whether prolactin is lactogenic in the rabbit in the absence of the adrenal glands.
Virgin female
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