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Related Experiment Videos

Blood parameters and turnover data in calves infested with lice.

L M Burns1, R N Titchener, P H Holmes

  • 1Environmental Sciences Department, Scottish Agricultural College, Auchincruive, Ayr.

Research in Veterinary Science
|January 1, 1992
PubMed
Summary

Bovine lice infestations like Linognathus vituli do not cause anemia but can decrease iron turnover and increase red blood cell survival in calves. Appetite and weight gain are generally unaffected.

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Area of Science:

  • Veterinary Parasitology
  • Animal Physiology
  • Hematology

Background:

  • Naturally occurring infestations of young Ayrshire calves with the long-nosed sucking louse (Linognathus vituli) are common.
  • Understanding the physiological impact of such infestations is crucial for animal health management.

Purpose of the Study:

  • To investigate the erythrokinetic and plasma protein turnover in calves infested with Linognathus vituli.
  • To quantify the impact of louse infestation on red blood cell dynamics and iron metabolism.

Main Methods:

  • Erythrokinetic studies using chromium-51 (51Cr)-labeled red blood cells.
  • Plasma iron turnover studies utilizing iron-59 (59Fe)-labeled transferrin.
  • Albumin turnover assessment with iodine-125 (125I)-labeled albumin.

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  • Monitoring liveweight gain and appetite throughout the infestation period.

    • Main Results:

    • Calves infested with Linognathus vituli did not develop anemia.
    • A significant decrease in plasma iron turnover rates was observed in infested calves.
    • Red blood cell survival time was significantly increased in the presence of lice.
    • Liveweight gain was slightly greater in uninfested animals, though not statistically significant.
    • Albumin catabolism and circulating red cell/plasma volumes remained largely unaffected.

    Conclusions:

    • Linognathus vituli infestation in calves alters iron metabolism and red blood cell kinetics without inducing anemia.
    • The increased red blood cell survival time suggests a compensatory mechanism or reduced loss.
    • Further research could explore the specific mechanisms behind these hematological changes.