"Note that the figures for producing a pound
                                 of beef represent water which is used over
a
                               2-plus year period, since food cattle are
generally
                               slaughtered prior to 2-years-old, dairy
cattle may
                                 live 4 years before being turned into
burgers,
                                     and range cattle live to 5 or 6."

This may explain the numbers, but they still seem high.