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?< *********************************************** To temporarily stop your subscription: set lactnet nomail To start it again: set lactnet mail (or digest) To unsubscribe: unsubscribe lactnet All commands go to [log in to unmask] The LACTNET mailing list is powered by L-Soft's renowned LISTSERV(R) list management software together with L-Soft's LSMTP(R) mailer for lightning fast mail delivery. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html