J. Anim Sci.
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J. Anim Sci. 1971. 32:137-141.
© 1971 American Society of Animal Science
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Hormonal Response to Milking1

H. Allen Tucker2

Michigan State University, ,3 East Lansing 48823

Abstract

Serum levels of prolactin are significantly (P<0.01) elevated by milking or washing the udder, or by simulated venepuncture in the neck of the cow. Serum levels of growth hormone or LH were not appreciably altered by any of these stimuli. The magnitude of the prolactin response among individual cows to these stimuli was markedly variable. Elevated levels of prolactin were attained usually within 5 min. after the stimuli were applied, but they returned to basal levels by 30 to 35 minutes. Neither continuous milking or repetitively washing the udder maintained the elevated level of prolactin.

Footnotes

1 Journal Article No. 4831 from the Michigan Agricultural Experiment Station.

2 The author gratefully acknowledges the assistance of James Koprowski, Lloyd Swanson, Roger Purchas and Dr. Edward Convey in the collection of these data.

3 Department of Dairy.






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Copyright © 1971 by the American Society of Animal Science.