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Methods of Sample Preparation for Chemical Determination of Chromic Oxide in Bovine Feces

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

ABSTRACT

Fecal samples were prepared by four different methods to observe the variation and per cent recovery of added chromic oxide with each method. Variation was greatest in the samples dried and ground with a Wiley mill and those homogenized and analyzed wet. The standard errors of the samples dried and ground with a hand grinder and those homogenized and analyzed dry were lower than those of the other two groups of samples. The average per cent recovery ranged from a low of 98.8% (homogenized, analyzed wet) to a high of 100.2% (homogenized, analyzed dry). The variation in chromic oxide concentration tended to be greater in samples containing the highest per cent moisture at time of analysis.