Ratio of Serum Urea to Serum Creatinine in Wild Black Bears
- 16 November 1984
- journal article
- research article
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 226 (4676) , 841-842
- https://doi.org/10.1126/science.6494914
Abstract
In winter, the ratio of serum urea to serum creatinine is 10 or less in denning female and male bears. In midsummer it is 22 or more, similar to that of other mammals. However, in late summer and early fall, while food is available, the urea-to-creatinine ratio approaches or becomes 10 or less. The low value of this ratio appears to indicate the biochemical state of hibernation, and many bears are in this state weeks before they den.This publication has 5 references indexed in Scilit:
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- Effect of winter sleep on pituitary-thyroid axis in American black bear.American Journal of Physiology-Endocrinology and Metabolism, 1979
- Annual Testosterone Rhythm in the Black Bear (Ursus americanus)1Biology of Reproduction, 1976
- Determination of serum creatinine by a direct colorimetric methodClinica Chimica Acta; International Journal of Clinical Chemistry, 1973
- Metabolism of bears before, during, and after winter sleepAmerican Journal of Physiology-Legacy Content, 1973