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Hematologic observations on the yak.

W H Adams, I L Graves, S Pyakural

    Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine (New York, N.Y.)
    |March 1, 1975
    PubMed
    Summary
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    Yak hemoglobin analysis reveals a unique Hb slow, potentially significant for high-altitude adaptation. Physiological adjustments, not hematological ones, may be key after blood loss in yaks.

    Area of Science:

    • Zoology
    • Biochemistry
    • Physiology

    Background:

    • The yak possesses two distinct hemoglobins that share a common globin chain.
    • Hemoglobin slow (Hb slow) is identified as unique among studied ruminants, specifically in yaks.

    Purpose of the Study:

    • To investigate the characteristics of yak hemoglobin, including the unique Hb slow.
    • To assess the potential role of Hb slow in high-altitude adaptation in yaks.
    • To understand yak hematological and physiological responses to acute blood loss.

    Main Methods:

    • Comparative analysis of hemoglobin composition in yaks and other ruminants.
    • Examination of 2,3-diphosphoglycerate (2,3-DPG) levels.
    • Assessment of hemoglobin production following acute blood loss.

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    Main Results:

    • Yak hemoglobin exhibits two forms, sharing a common globin chain.
    • Hemoglobin slow is a distinctive feature of yaks within the studied ruminant group.
    • 2,3-DPG levels remain unchanged after acute blood loss, and disproportionate hemoglobin production does not occur.

    Conclusions:

    • The unique Hb slow in yaks may have implications for high-altitude adaptation, although its specific role requires further investigation.
    • Physiological adjustments, rather than hematological responses like increased hemoglobin production, appear more critical for yaks after acute blood loss.