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Use of Radioactive Chromium Oxide in Digestibility Determinations

Dairy Cattle Research Branch, USDA, Beltsville, Maryland

ABSTRACT

Radioactive chromium oxide was tested as a digestibility indicator in dairy cattle by making direct comparisons of component digestibility coefficients with total collection procedure and chromium oxide ratio technique. The use of a radioactive isotope as a digestibility reference substance was found to save time and labor and, under the conditions of this experiment, to display about the same degree of precision as the two other methods studied. A disadvantage to the use of isotopes in this type of study is the increased care and expense involved in the disposal and handling of animals and excreta, as dictated by current Atomic Energy Commission and Food and Drug regulations.

¹ Data presented are part of a thesis presented by the senior author in partial fulfillment of the requirements for the Degree of Doctor of Philosophy at the Graduate School of Georgetown University, Washington, D. C., 1957.