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Fatty acid composition of black bear (Ursus americanus) milk during and after the period of winter dormancy

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Lipids

Abstract

Black bears give birth and lactate during the 2–3-mon fast of winter dormancy. Thereafter the female emerges from the den with her cubs and begins to feed. We investigated fatty acid patterns of milk from native Pennsylvania black bears during the period of winter dormancy, as well as after den emergence. Throughout winter dormancy, milk fatty acid composition remained relatively constant. The principal fatty acids at all times were 14∶0, 16∶0, 16∶1, 18∶0, 18∶1, 18∶2n−6, 18∶3n−3 and 20∶4n−6. After den emergence, large changes occurred in almost all the fatty acids, particularly in 18∶2n−6 and 18∶3n−3. Large variability among the active free-ranging animals likely reflected differences in diet. In a carnivore, with apparently limitedde novo synthesis of fatty acids, milk fatty acid composition may be affected by factors such as transition from reliance on stored lipids to feeding, and by temporal changes in dietary intake.

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Abbreviations

ANOVA:

analysis of variance

EFA:

essential fatty acid

GC:

gas chromatograph

GLC:

gas-liquid chromatography

HPLC:

high-performance liquid chromatography

PP:

postpartum

PUFA:

polyunsaturated fatty acid

TG:

triglyceride

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Authors and Affiliations

  1. Canadian Institute of Fisheries Technology, Technical University of Nova Scotia, 1360 Barrington St., P.O. Box 1000, B3J 2X4, Halifax, Nova Scotia, Canada

    Sara J. Iverson

  2. National Zoological Park, Smithsonian Institution, 20008, Washington, D.C.

    Sara J. Iverson & Olav T. Oftedal

Authors
  1. Sara J. Iverson
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  2. Olav T. Oftedal
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Iverson, S.J., Oftedal, O.T. Fatty acid composition of black bear (Ursus americanus) milk during and after the period of winter dormancy. Lipids 27, 940–943 (1992). https://doi.org/10.1007/BF02535877

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  • DOI: https://doi.org/10.1007/BF02535877

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