Wondered about lactose after Todd asked the question. Found this. Scroll down to see the chart on milk composition across species: http://classes.aces.uiuc.edu/AnSci308/milkcomp.html Also has a page on human milk/lactation: http://classes.aces.uiuc.edu/AnSci308/HumanLact.html Marsupial milk........for Andrew: <g> http://classes.aces.uiuc.edu/AnSci308/marsupialslact.html And a page that includes info on ketosis in lactating cows. Jeez, fatty liver?!! http://classes.aces.uiuc.edu/AnSci308/factorsaffecting.html Theola