The rate of milk secretion in farrow cows may be expressed as
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in which y = yield and t = time from calving. Pregnancy causes a decrease in yield which may be expressed as
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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.
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Copyright, 1926, by The Rockefeller Institute for Medical Research
1926
