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The Development of the Mammary Gland

Missouri Agricultural Experiment Station

Abstract

A systematic study of the anatomy of the mammary glands and of the physiology of milk secretion is being undertaken at the Missouri Agricultural Experiment Station. In our work the development of the mammary glands has been separated into the following sexual epochs: (a) Embryonic and fetal period; (b), birth to puberty; (c), the oestrous cycles; (d), pregnancy; (e), lactation; and (f), involution.

This report is devoted to the first section, in which a histological study was made of the development of the glands of a graded series of male and female cattle embryos and fetuses obtained at an abattoir at Madison, Wis. The specimens numbering about 109 were fixed in Bouin's fluid.¹ The embryos were then sent to Missouri where the histological study of the material was made.

Unfortunately the ages were unknown. It is necessary, therefore, to consider the development of the mammary glands in terms of growth in crown-rump length. Limited data are available for estimating the age from the length of the fetus. "Whenever an age is given it will refer to the age estimated from these data (Zschokke, (1920), Hammond, (1927)).