luteotrophic hormone

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A gonadotropic hormone encoded by PRL on chromosome 6p22.2-p21.3 and secreted by the anterior pituitary, which in females stimulates mammary gland growth and lactation after childbirth.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

luteotrophic hormone (LTH) or lactogenic hormone or prolactin

a proteinaceous hormone secreted by the anterior PITUITARY GLAND of vertebrates which has a range of functions, including acting as a GONADOTROPHIN. LTH influences the onset of lactation, stimulates PROGESTERONE secretion by the CORPUS LUTEUM in mammals (in tandem with LUTEINIZING HORMONE) and stimulates maternal behaviour in all vertebrates.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005