Recovery of Chromic Oxide Administered in Paper to Grazing Steers

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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. Copyright © 1969. American Society of Animal Science . Copyright 1969 by American Society of Animal Science

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