After each change in diet, the first two days' milkings were discarded,
and the milk collected during the remaining five days was heated to iio ~ F.
homogenized, placed in conventional parattined milk cartons and frozen and
stored at - Io ~ F. for use in the rat feeding test. An accurate record was kept
of the amount of concentrate and hay consumed and the amount of milk
produced by each cow for each test period. (table i).