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Mycotic abortion in cattle.

I P McCausland, K J Slee, F S Hirst

    Australian Veterinary Journal
    |May 1, 1987
    PubMed
    Summary

    Fungal infections caused 131 of 1107 bovine abortions, primarily from Aspergillus sp. and Mortierella wolfii (M. wolfii), often linked to silage.

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    Area of Science:

    • Veterinary Pathology
    • Mycology
    • Animal Reproduction

    Background:

    • Bovine abortions pose significant economic challenges in cattle farming.
    • Fungal infections are recognized as a cause of sporadic bovine abortion.
    • Accurate diagnosis and identification of causative agents are crucial for prevention.

    Purpose of the Study:

    • To investigate the prevalence and types of fungal infections causing bovine abortions.
    • To identify the etiological agents responsible for these abortions.
    • To explore potential associations between fungal abortion and animal husbandry practices.

    Main Methods:

    • Examination of placentas and fetuses from 1107 bovine abortions.
    • Histopathological analysis of tissues using silver impregnation.
    • Fungal culture for etiological identification.
    • Questionnaires to assess feeding and management practices.

    Main Results:

    • Fungal infections were diagnosed in 131 (11.8%) cases.
    • Identified fungi included Aspergillus sp. and Mortierella wolfii (M. wolfii).
    • M. wolfii abortions were frequently linked to poorly stored grass silage.
    • Placental examination (gross, microscopic, culture) was diagnostically valuable; fetal examination was rarely informative.
    • No association was found between Aspergillus sp. abortions and hay or silage feeding.

    Conclusions:

    • Fungal infections, particularly by Aspergillus sp. and M. wolfii, are a notable cause of bovine abortion.
    • Poorly prepared silage is a likely risk factor for M. wolfii abortions.
    • Diagnostic efforts should focus on placental tissues.
    • Fertility appears unaffected following fungal abortion.

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