Question

why the milk colour of cow is yellow.

Answer 1

Bcz it contains a colouring pigment called Beta-Carotene(a cartenoid which is percussor of vitamin A)
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Answer 2

Cow milk contains a colouring pigment called beta carotine.
It is yellowish because it contains xanthophyll , riboflavine, etc.
It colour is yellow because of presence of high fat content of butter and due to eating of grass by cow.
Hope it helps you.