It synthesizes and stores milk until it is time for the milk to come out either by stimulation from the milking machine or by hand or by the scent and suckling action of the cow's calf.
Not in terms of structure. But in terms of size and average milk production, definately. A Holstein has been bred to produce far more milk than her calf can take; a Hereford cow's udder has been...
The cow's mammary gland is called an udder. Mammary glands produce milk to nourish the baby calf. Mammary glands develop in the heifer prior to birth, and further develop and grow when the heifer is...
When a heifer is pregnant with a calf, the mammary tissues that have come about when she was a calf herself in her mother's womb, begin a further process of growth and maturity, which is encouraged...