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a Daniel F. and Ada L. Rice Conservation Biology and Research Center, Chicago Zoological Society, Brookfield Zoo, Brookfield, IL 60513 and b Department of Human Nutrition and Dietetics, University of Illinois at Chicago, Chicago, IL 60612
Accumulation of carotenoids varies greatly among animal species and is
not fully characterized. Circulating carotenoid concentration data in
captive wild animals are limited and may be useful for their
management. Serum carotenoid concentrations and dietary intakes were
surveyed and the extent of accumulation categorized for 76 species of
captive wild animals at Brookfield Zoo. Blood samples were obtained
opportunistically from 275 individual animals immobilized for a variety
of reasons; serum was analyzed for
- and ß-carotene, lutein +
zeaxanthin, lycopene, ß-cryptoxanthin and canthaxanthin. Total
carotenoid content of diets was calculated from tables and chemical
analyses of commonly consumed dietary components. Diets were
categorized as low, moderate or high in carotenoid content as were
total serum carotenoid concentrations. Animals were classified as
unknown, high, moderate or low (non-) accumulators of dietary
cartenoids. Nonaccumulators had total serum carotenoid concentrations
of 0101 nmol/L, whereas accumulators had concentrations that ranged
widely, from 225 to 35,351 nmol/L. Primates were uniquely distinguished
by the widest range of type and concentration of carotenoids in their
sera. Most were classified as high to moderate accumulators. Felids had
high accumulation of ß-carotene regardless of dietary intake, whereas
a wide range of exotic birds accumulated only the xanthophylls,
lutein + zeaxanthin, canthaxanthin or cryptoxanthin. The exotic
ungulates, with the exception of the bovids, had negligible or
nondetectable carotenoid serum concentrations despite moderate intakes.
Bovids accumulated only ß-carotene despite moderately high
lutein + zeaxanthin intakes. Wild captive species demonstrated a
wide variety of carotenoid accumulation patterns, which could be
exploited to answer remaining questions concerning carotenoid
metabolism and function.
KEY WORDS: serum carotenoids dietary carotenoids animals exotic animals
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