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Hormonal Induction of Lactation in the Bovine: Mammary Gland Histology and Milk Composition¹

Department of Animal and Poultry Science, University of Guelph, Guelph, Ontario, Canada

ABSTRACT

Mammary gland histology and milk composition were studied in Holstein cows and heifers induced to lactate following 17ß-estradiol and progesterone therapy for 7 days. The most notable gross histological observation was a large number of immature or developing ducts and alveoli. These ducts and alveoli were without lumen and consisted mainly of clumped columnar epithelial cells. No gross histological abnormalities were seen. The composition of milk from induced lactations with regard to fat, protein, and lactose percentages was not significantly different from milk from lactations following parturition during the first 21 days of lactation.

¹ Research supported by the Ontario Ministry of Agriculture and Food and the National Research Council of Canada, Grant No. A-6247.

² Post-graduate student on Canadian International Development Agency Scholarship.

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