Case Study: Iron in Black Rhinoceros Diets: The Impact of Pasture

Over the course of a year, serum ferritin and iron in a black rhinoceros (Diceros bicornis) increased over time, despite a prescribed diet low in iron. To identify additional sources of iron intake, vegetation in the enclosure was analyzed for iron content. Iron concentrations in enclosure samples averaged 736 ppm, well in excess of maximum recommended total-diet concentrations of 300...