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Mandibulofacial defects in lambs from two flocks.

S M Dennis

    Australian Veterinary Journal
    |March 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Teratogenic plant exposure during early pregnancy in ewes may cause severe mandibulofacial defects in lambs. These congenital abnormalities, including micrognathia and clefts, were observed during an autumn lambing season.

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    Area of Science:

    • Veterinary Pathology
    • Teratology
    • Sheep Reproduction

    Background:

    • Congenital mandibulofacial defects can significantly impact livestock health and productivity.
    • Understanding the etiology of birth defects is crucial for prevention and control in animal populations.

    Purpose of the Study:

    • To describe and characterize mandibulofacial defects observed in two sheep flocks.
    • To investigate potential causes, specifically teratogenic agents, associated with these defects.

    Main Methods:

    • Clinical and pathological examination of affected lambs.
    • Epidemiological data collection focusing on ewe lambing times and potential environmental exposures.

    Main Results:

    • Multiple severe craniofacial abnormalities were identified, including micrognathia with microtia, brachycephalus, perocephaly, bilateral oro-auricular cleft, and aprosopia.

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  • The defects were exclusively observed in lambs from ewes that lambed early in the season.

    • Conclusions:

    • The temporal association with early lambing suggests a teratogenic plant exposure as a likely cause of the observed mandibulofacial defects.
    • Further investigation is warranted to identify the specific teratogen responsible for these congenital malformations.