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Frequency of Discharge of Pituitary Milk "Let-Down" Hormone¹

Ruakura Animal Research Station, Hamilton, New Zealand, and the Missouri Agricultural Experiment Station, Columbia

ABSTRACT

Experiments are described which show that some dairy cows may be normally milked at 2-hr, intervals. By maintaining a normal milking routine at which only the regular milker was present it was shown that usual let-down and milk removal was obtained in three cows.

In the light of these results it seems likely that the previously reported failures when 2-hr, milking was attempted could be explained in terms of such an unusual procedure being associated with stimuli which inhibited the cows.

The results add further strength to the view that when incomplete let-down occurs the cow concerned may be persuaded by gentle massage of the udder and other similar stimulation to discharge a second quantity of let-down hormone.

¹ Contribution from the Department of Dairy Husbandry, Missouri Agr. Expt. Sta., Journal Series no. 1309.

Fulbright Research Scholar.