Somatic cells are the white blood cells that are the defence against bacteria that invade the udder and can cause mastitis. Cow's milk can legally contain up to 400 million pus cells/litre

Pus is made up of dead white blood cells, bacteria and dead skin cells. ... There are white blood cells in milk, In the dairy industry we closely monitor what we call the somatic cell count (SCC) of our cows and our milk. Somatic cell count (SCC) is a measurement of how many white blood cells are present in the milk

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