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Lactation Studies. IV. Rates of Milk Secretion during Between-Nursing Intervals of 3, 6, 9, and 12 Hours Using Sprague-Dawley Rats¹

Department of Dairy Husbandry, University of Minnesota, St. Paul

ABSTRACT

The relationship between milk production rates and intervals after which milk is removed from the mammary gland is not a simple one. The average secretion rate of milk during any given interval changes progressively for several intervals whenever a change in intervals is made. Moreover, when a slight difference in secretion rates is attributed to differences in intervals observed over a short series of observation, there are cumulative effects over long comparison periods and differences become larger.

To measure true milk secretion rates, one must take into account changes in the amount of milk in the gland after removal of milk between the start and finish of the interval. If oxytocin is utilized to minimize gland residual milk it is still necessary to know whether there have been changes in residual milk and whether oxytocin affects the relation between secretion rate and intervals between evacuations of milk from the mammary gland.

¹ Scientific Journal Series Paper No. 5330, Minnesota Agricultural Experiment Station.