A general purpose controlled release (CR) intra-ruminal device (CRD) containing chromium sesquioxide (Cr2O3) was used to measure mean daily fecal dry matter excretion (FE). The FE of penned sheep, estimated using the CRD, was 1.02 ± 0.04 of actual FE, independent of diet. A single, uniform release rate for the CRD was observed in grazing and penned sheep.
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Laby et al. (1984) studied this question.