The Journal of General Physiology
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The Journal of General Physiology, Vol 9, 325-332, Copyright © 1926 by The Rockefeller University Press

ARTICLE

THE EFFECT OF ADVANCE IN LACTATION AND GESTATION ON MAMMARY ACTIVITY

W. L. Gaines 1 and F. A. Davidson 1

1 From the Department of Dairy Husbandry, University of Illinois, Urbana.

The rate of milk secretion in farrow cows may be expressed as

See PDF for Equation,

in which y = yield and t = time from calving. Pregnancy causes a decrease in yield which may be expressed as

See PDF for Equation,

in which i = inhibition or decrease in yield and p = time from conception. The constant K appears to be the same for various groups but b is roughly proportional to a. The decrease in yield associated with pregnancy is interpreted as due to a hormone. The hormone hypothesis also affords an interpretation of the increasing rate of milk secretion which occurs for a short time following parturition.

 Accepted on October 26, 1925


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