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The effect of mammalian lactogenic hormone on lower chordates

Published online by Cambridge University Press:  11 May 2009

D. B. Carlisle
D. B. Carlisle
Affiliation:
The Plymouth Laboratory
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Extract

If a male dogfish is held in the hand and its belly stroked firmly backwards with the ball of the thumb a fluid can be expressed from the cloaca. In my experience this fluid in a fresh animal invariably contains sperm, whatever the season of the year. After a period of inanition, however, sperm eventually disappears from the cloacal fluid. Such an animal is a convenient test object for gonadotropic activity by a method which closely parallels the toad-pregnancy test of Galli Mainini (1947).

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 33 , Issue 1 , February 1954 , pp. 65 - 68
Copyright
Copyright © Marine Biological Association of the United Kingdom 1954

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