The Milk Production Process
Milk Animation
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Alveoli
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The Milk Production Process
When the udder is stimulated for milk letdown, usually by washing, stripping or suckling by the calf, nerve impulses pass up to the cow's brain. These impulses cause the pituitary gland to release the hormone known as oxytocin. Oxytocin is carried to the udder through the bloodstream.

When oxytocin reaches the udder, through the bloodstream, it causes the contraction of the muscles surrounding each alveolus. This forces milk into the ducts and cisterns. It takes approximately 40-60 seconds for oxytocin produced by the pituitary gland to reach the udder and start milk letdown.

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