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New Developments in the Physiology and Biochemistry of Lactation; a Review¹

University of Minnesota, St. Paul, Minnesota

ABSTRACT

The physiological and biochemical aspects of lactation may be divided broadly into three phases.

1. Development of the mammary glands.
   
2. II. Lactation.
   
3. III. Ejection of milk from the smaller gland recesses.
   

A comprehensive review of the literature pertaining to all of these would require far more space than is available. It is, therefore, proposed to deal only superficially with the endocrine aspects of gland development and the lactogenic hormones. The biochemical aspects will be dealt with more extensively but not exhaustively. It shall rather be the purpose to review the more recent pertinent literature with a view of establishing the present status of research in this field.

I. DEVELOPMENT MAMMARY GLANDS

The literature pertaining to the growth of the mammary glands has recently been reviewed by Nelson (167), Turner (253), Folley (45), and Riddle (215, 216). For anatomical features of mammary development, see Turner (254, 255) and Espe (38).

¹ Scientific Journal Series Paper No. 1948, Minnesota Agricultural Experiment Station. Prepared with the assistance of Work Project Administration, Official Work No.65-1-71-140. Sponsor: University of Minnesota.