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We have previously demonstrated a relationship between dry matter (DM) intake and the degree of transfer of radiocaesium to the muscle of adult sheep. Here, we present the results of an experiment during which we examined the\udeffect of lamb growth and protein turnover rates, brought about by controlling feed DM intakes, on radiocaesium\udtransfer and turnover. Lambs with high DM intakes and, as a consequence, high rates of growth, had a lower mean\udradiocaesium transfer coefficient from the diet to muscle than lambs with lower intake and growth rates. Furthermore,\udhigh rates of dry matter intake decreased the biological half-life of radiocaesium from muscle. The administration of\ud[3%]-ntethionine to the study lambs enables us to suggest that radiocaesium transfer may be related to protein turnover.\udWhen the results were compared with those of other studies using sheep, a consistent relationship between DM\udintake and radiocaesium transfer across all animals regardless of age or physiological status was observed.\udExtrapolation of the relationship to DM intake rates appropriate to cattle predict radiocaesium transfer coefficients in broad agreement with reported values.\u

Dry matter intake - a generic approach to predict the transfer of radiocaesium to ruminants ?