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  • A milkman is very upset one morning as his cow refuses to give any milk The milkmans wife gets the calf from the shed On fondling by the calf the cow gave sufficient milk Describe the role of endocrine gland

A milkman is very upset one morning as his cow refuses to give any milk. The milkman's wife gets the calf from the shed. On feeding by the calf, the cow gave sufficient milk. Describe the role of the endocrine gland and the pathway associated with this response.

Answers (1)

Milk secretion in mammals is provoked by the hormone known as oxytocin which works on positive feedback mechanisms.

(a) When the calf sucks on the cow, it stimulates the nerve impulses.
(b) Nerve impulses send signals to the hypothalamus, which starts producing oxytocin in the body.
(c) Therefore, Oxytocin results in the contraction of the smooth muscles around the cow's udder and hence milk is released.


Udder (suckling stimulus) \rightarrow Hypothalamus\rightarrow  Posterior lobe of pituitary \rightarrowOxytocin (in the blood)\rightarrow Udder (Smooth muscles) \rightarrow Milk flow.

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