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Recovery of Chromic Oxide Administered in Paper to Grazing Steers¹

New Mexico State University and and U.S. Department of Agriculture, Las Cruces

Abstract

Average recovery of chromic oxide was 71.5% for days 3 through 8 when the indicator was administered as a component of shredded paper in boluses to five steers grazing dormant tobosa. Steer differences were significant (P<.05) with recovery ranging from 54.4 to 85.5%, but differences among days (3 through 8) were not significant (P>.05). When the shredded paper was packed in gelatin capsules and administered to four steers grazing dormant tobosa, average recovery for days 4 through 9 was 82.4%. Steer and day differences were not significant. With four steers grazing green tobosa, average recovery of chromic oxide was 88.0% for days 4 through 10, and 93.4% for days 7 through 10 when the indicator was administered in paper boluses. Differences among days (4 through 10) were not significant, but steer differences were significant (P<.05). Concentration of chromic oxide in the feces varied throughout the day. The highest average recovery (79.5%) was obtained at 5 p.m., and this recovery was significantly higher (P<.05) than the recoveries for 5 a.m. through 3 p.m.

Recovery of chromic oxide was considerably less than 100% and was highly variable among steers. Apparently, administering this indicator impregnated in shredded paper is no better than other methods of administration and results in wide variation among animals within a trial and between trials.

¹ Published as Journal Series No. 315, New Mexico Agricultural Experiment Station. Cooperative investigations of the Department of Animal, Range and Wildlife Sciences, New Mexico State University and the Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture. Partially supported by Western Regional Research Project W-94, Range Livestock Nutrition.

² Research assistant, Graduate student, and Professor, New Mexico State University, and Range Scientist, Agricultural Research Service, U. S. Department of Agriculture, respectively.