Abstract
Rickets and fractures have been reported in captive polar bears. Taurine (TAU) is key for the conjugation of ursodeoxycholic acid (UDCA), a bile acid unique to bears. Since TAU-conjugated UDCA optimizes fat and fat-soluble vitamin absorption, we asked if TAU deficiency could cause vitamin D malabsorption and lead to metabolic bone disease in captive polar bears. We measured TAU levels in plasma (P) and whole blood (WB) from captive and free-ranging cubs and adults, and vitamin D3 and TAU concentrations in milk samples from lactating sows. Plasma and WB TAU levels were significantly higher in cubs vs captive and free-ranging adult bears. Vitamin D in polar bear milk was 649.2±569.2 IU/L, similar to that found in formula. The amount of TAU in polar bear milk is 3166.4±771 nmol/ml, 26-fold higher than in formula. Levels of vitamin D in bear milk and formula as well as in plasma do not indicate classical nutritional vitamin D deficiency. Higher dietary intake of TAU by free-ranging cubs may influence bile acid conjugation and improve vitamin D absorption.
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Chesney, R.W. et al. (2009). Does Taurine Deficiency Cause Metabolic Bone Disease and Rickets in Polar Bear Cubs Raised in Captivity?. In: Azuma, J., Schaffer, S.W., Ito, T. (eds) Taurine 7. Advances in Experimental Medicine and Biology, vol 643. Springer, New York, NY. https://doi.org/10.1007/978-0-387-75681-3_33
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DOI: https://doi.org/10.1007/978-0-387-75681-3_33
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