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Recovery of Radioactive Chromic Oxide from the Bovine Gastrointestinal Tract¹

Department of Animal Sciences, University of Kentucky, Lexington, Kentucky 40506

Six Aberdeen Angus heifers were confined to metabolism crates and orally dosed with approximately 146 µCi of ⁵¹Cr₂O₃ to determine whether chromic oxide was absorbed from the bovine gastrointestinal tract. No radioactivity was detected in the blood or urine. Fecal excretion patterns of ⁵¹Cr₂O₃ were established for each individual animal. An average of 87.2% of the orally dosed ⁵¹Cr₂O₃ was recovered in the feces by 216 hours. Ninety-eight percent of the ingested unlabeled chromic oxide was recovered in the feces as measured by chemical analyses. Coefficients of digestibility were not different (P > 0.05) when calculated by total collection methods compared with the chromic oxide ratio technique.

² Present address: Department of Animal Science, Georgia Coastal Plain Experiment Station, Tifton, Georgia 31794.

Manuscript received 23 April 1970.