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The Effect on Milk and Fat Production of Injections of Oxytocin at Alternate 14-day Periods during Lactation¹

Department of Dairy Husbandry, University of Wisconsin, Madison and Bureau of Dairy Industry, U. S. Department of Agriculture, Washington, D. C.

ABSTRACT

The effect of an intravenous oxytocin injection at alternate 14-day periods on milk and fat production of seven Holstein-Friesian cows during a lactation has been studied. Mean daily production per cow during the injection periods was 3.6 lb. higher than during control periods when the transition day was omitted from each period. The per cent of fat in the milk was not significantly different between the experimental and control periods.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station. A contribution from the Wisconsin Agricultural Experiment Station as a collaborator under the North Central Region cooperative project entitled "Improvement of Dairy Cattle Through Breeding—NC2," conducted in cooperation with the Bureau of Dairy Industry, U.S.D.A.

² Agent of the Bureau of Dairy Industry.