|SREL Reprint #0474|
Digestibility and Elemental Assimilation in Cotton Rats
W. Kaufman, Michael J. O’Farrell, Glennis A. Kaufman, and Susan E. Fuller
Digestibility (82%) was measured directly for 10
cotton rats in the laboratory. Subsequently,
digestibility was estimated using the ratio of ash in food and feces as well as
the ratio technique with 15 specific elements.
Digestibility estimates were all too low, therefore, the fecal ash values
were corrected relative to a digestibility of 82%.
Using the same correction factor with the modified ash ratio technique,
digestibility was estimated to be 78% under field conditions.
Digestibility values for the 23 field-caught cotton rats were all too low
using the ratio technique for the 15 specific elements, however, the Ba estimate
was 76%. Assimilation of each
element under both laboratory and field conditions were estimated from
digestibility values and the elemental concentration data for stomach contents
and feces. Problems with estimating
elemental assimilation are discussed relative to the specific elements examined.
SREL Reprint #0474
Kaufman, D.W., M.J. O'Farrell, G.A. Kaufman, and S.E.
Fuller. 1976. Digestibility and elemental assimilation in cotton
rats. Acta Theriologica 21:147-156.