I have never heard this, but could it be a statistic formulated from the average blood volume of a cow compared to the average milk yield?
No doubt it is worked out from a herd of cattle containing x number of cows & the amount of milk sent to the dairy.
I expect there are many individual variables between each cow just as there are between lactating women

Sheila Company UK

<A mom who is a daughter of a dairy farmer said that "it is know" (in
dairy
circles, I presume) that is takes 400 liters of milk running through
the udder
to produce 100ml of milk and she wonders if that is the same in humans.
I would
say that it could be alike in women and cows, but I really wouldn't
know for
sure or how to find out. Any ideas?<



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