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Lactation in a Barren Heifer¹

Department of Genetics, University of Wisconsin, Madison

ABSTRACT

A case is reported of a barren heifer which, in response to sucking and milking, started to produce milk and continued to do so for 630 days. During the first six months of lactation there was a steady increase in the daily yield of milk, followed by a subsequent decline. The maximum daily yield was 18.7 pounds, and the total lactation yield was 5011.9 pounds. According to chemical analyses made the milk was normal in every respect. The probable causes of the initiation and increase in milk secretion are briefly discussed.

¹ Contribution from the Department of Genetics. Wisconsin Agricultural Experiment Station, Madison, Wis. Paper No.144. Published with the approval of the Director.