The ducts in the newborn breast are rudimentary and
have small, club-like ends that regress soon after birth.
Before puberty, the growth of the breast is isometric.
Allometric growth of both the stroma and epithelium
begins with the onset of puberty (8–12 years of age).
Although the impact of obesity on breast development at
this stage is unknown, it is of interest that ruminants fed
a diet that is higher than their energy requirements have
impaired mammary development and subsequent im-
paired lactation performance
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