Determination of tannin levels in various plants and their possible effect on iron chelation in lemurs

Lemurs are one of several species that can suffer from excess iron accumulation in tissues, termed hemosiderosis. The more severe form, hemochromatosis, develops when hemosiderosis is accompanied by functional or morphologic evidence of iron toxicity and may result in clinical disease and death. Organs most often affected include the liver, heart, spleen, and gastrointestinal tract. The pathology of this problem/disease...

The effect of length of cold storage on secondary plant compounds in browse for captive black rhinoceros (Diceros bicornis)

The endangered black rhinoceros (Diceros bicornis) suffers from a high rate of mortality in captivity due to conditions such as hemosiderosis and hemolytic anemia. Supplementation of the diet with native browse species rich in tannins and other iron-binding polyphenolics has been proposed as a dietary strategy for reducing iron absorption and accumulation in this population. This study examined the effect...

The effect of tannin on the in vitro solubilization of iron

The absorption of dietary iron can be greatly influenced by other constituents in the diet, such as ascorbic acid (vitamin C) and tannins. Ascorbic acid increases the bioavailability of iron by converting Fe3+ to Fe2+, while tannins can reduce the bioavailability of iron by binding to it. Captive herbivorous animals are often impacted by either the addition or absence of...

Secondary compounds in foods selected by free-ranging primates on St. Catherines Island, GA

The foraging behavior of two groups of free-ranging primates, ring-tailed lemurs (Lemur catta) and lion-tailed macaques (Macaca silenus), residing on St. Catherines Island Wildlife Center, Georgia was observed seasonally at quarterly intervals for one year. Each group (N=13, N=9, respectively) had unlimited access to native flora and fauna in addition to a daily provisional diet. Representative samples of non-provisioned items...