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Journal of Endocrinology (1979) 80, 343-351    DOI: 10.1677/joe.0.0800343
© 1979 Society for Endocrinology

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MAMMARY GROWTH DURING PREGNANCY IN HYPOPHYSECTOMIZED OR BROMOCRIPTINE-TREATED GOATS

H. L. BUTTLE, A. T. COWIE, E. A. JONES and A. TURVEY

Mammogenesis in primiparous hypophysectomized goats has been assessed between days 60 and 120 of gestation and compared with that found in untreated goats and goats treated with 5 mg bromocriptine/day. There were fivefold increases in the weight of lobulo-alveolar tissue in the hypophysectomized and bromocriptine-treated goats and a tenfold increase in the untreated goats. Histological examination of the mammary glands at 120 days showed normal structure, and determinations of lactose, lactose synthetase, cytosol enzymes, protein, DNA and RNA indicated qualitatively normal initiation of milk synthetic capabilities in both the hypophysectomized and bromocriptine-treated goats. Bromocriptine treatment lowered the plasma concentration of placental lactogen as well as that of prolactin.

The results indicate that placental lactogen has important mammogenic effects during pregnancy.




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B Anguiano, R Rojas-Huidobro, G Delgado, and C Aceves
Has the mammary gland a protective mechanism against overexposure to triiodothyronine during the peripartum period? The prolactin pulse down-regulates mammary type I deiodinase responsiveness to norepinephrine
J. Endocrinol., November 1, 2004; 183(2): 267 - 277.
[Abstract] [Full Text] [PDF]




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