Excretion of chromium sesquioxide administered as a component of paper to sheep

Abstract

It has been shown (Corbett, Greenhalgh & McDonald, 1958; Corbett, Greenhalgb & Florence, 1959) that the diurnal variation in the concentration of chromium sesquioxide (Cr203) in the faeces of ruminants that have received regular concentrated doses of this marker is due primarily to uneven mixing of the oxide with the contents of the reticulo-rumen and to its passage from this organ in advance of the food residues it is intended to mark. It is unlikely, however, that a better marker substance than Cr203 will be found (Corbett, Greenhalgh, Gwynn & Walker, 1958).