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Induced thiamin deficiency in lambs

E J Thornber, R H Dunlop, J M Gawthorne

    Australian Veterinary Journal
    |January 1, 1981
    PubMed
    Summary
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    Thiamin deficiency in lambs causes a bone marrow deficit in red blood cell precursors before brain changes appear. Glucose metabolism in the brain remains unaffected by this thiamin deficiency.

    Area of Science:

    • Veterinary Medicine
    • Biochemistry
    • Neurology

    Background:

    • Polioencephalomalacia (PEM) is a neurological disease affecting ruminants.
    • Thiamin deficiency is a known cause of PEM, but the precise biochemical changes preceding the disease are not fully understood.

    Purpose of the Study:

    • To investigate the hematological and biochemical characteristics of thiamin-deficient lambs prior to the terminal stages of polioencephalomalacia.
    • To elucidate the role of thiamin in erythrocyte production and brain metabolism.

    Main Methods:

    • Induction of polioencephalomalacia in pre-ruminant lambs through a specific feeding regimen.
    • Analysis of bone marrow erythrocyte precursors.
    • Measurement of erythrocyte transketolase activity.
    • Assessment of glucose utilization by the brain.

    Related Experiment Videos

  • Pharmacokinetic study of 35S-thiamin distribution and elimination.

    • Main Results:

    • A significant deficit in bone marrow erythrocyte precursors was observed before any pathological brain changes.
    • Erythrocyte transketolase activity was reduced, more so in thiamin-deficient lambs.
    • Brain glucose utilization remained unaffected by thiamin deficiency.
    • Thiamin-deficient lambs showed altered distribution kinetics of injected 35S-thiamin, indicating changes in thiamin pools.

    Conclusions:

    • Thiamin deficiency impacts erythrocyte production early in the disease process, preceding neurological symptoms.
    • Brain glucose metabolism is resilient to thiamin deficiency in the studied models.
    • Altered thiamin distribution kinetics suggest impaired thiamin utilization or transport in deficient lambs.