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How does milk come out of a cow?

Updated: 10/6/2023
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14y ago

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The control of mammary gland development and lactation is similar in the cow and human. It requires the action of prolactin secreted by the pituitary gland in concert with the actions of estrogen and progesterone and those supportive actions of other hormones. Milk is synthesized and secreted by the alveolar cells of the mammary gland, which do not fully develop until pregnancy. Full lactation (lactogenesis) is initiated at parturition when progesterone levels fall; progesterone inhibits milk secretion. In the cow, maintenance of lactation (galactopoiesis) does not require the continued production of prolactin, and it is believed that this function is carried out by the secretion of growth hormone from the pituitary gland.

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14y ago
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14y ago

The cow has udders which hang underneath the stomach; these fill with milk, and can be squeezed out by milkers (or by calves), through the nipples.

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14y ago

The same way it works in a human.

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Q: How does milk come out of a cow?
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