THE RELATIONSHIP BETWEEN LACTATION AND THE RELEASE OF PROLACTIN AND GROWTH HORMONE IN THE GOAT

I. C. HART

doi:10.1530/jrf.0.0390485

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THE RELATIONSHIP BETWEEN LACTATION AND THE RELEASE OF PROLACTIN AND GROWTH HORMONE IN THE GOAT

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I. C. HART

I. C. HART
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DOI:: https://doi.org/10.1530/jrf.0.0390485

Volume/Issue:: Volume 39: Issue 2

Page Range:: 485–499

Article Type:: Research Article

Online Publication Date:: Aug 1974

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The ability of pituitary hormones to cause udder growth and to initiate milk secretion in the goat was clearly demonstrated when it was shown that both mammary growth and lactation were induced in the ovariectomized virgin goat by twice-daily application of the milking stimulus (Cowie, Knaggs, Tindal & Turvey, 1968). It was further demonstrated that both of these responses were completely abolished in animals in which the pituitary stalk was transected before 'milking' was started. As earlier work had shown that suckling often resulted in a fall in pituitary hormone concentration (see Cowie & Tindal, 1971) it seemed probable that both mammary growth and lactation were initiated by elevated blood levels of pituitary hormones. Concerning the maintenance of milk secretion, partly successful hormonal replacement studies in the hypophysectomized lactating goat were first described by Cowie & Tindal (1961) followed by

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