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Inhibited development in Haemonchus contortus.

R M Connan

    Parasitology
    |October 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Seasonal inhibition of Haemonchus contortus in lambs is triggered by environmental cues, not cold temperatures. Preparasitic stages are key, with optimal induction occurring in dark, 25°C cultures, independent of host age.

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    Area of Science:

    • Veterinary Parasitology
    • Animal Health
    • Nematology

    Background:

    • Haemonchus contortus is a significant gastrointestinal nematode parasite of ruminants.
    • Understanding larval inhibition is crucial for controlling parasitic infections in livestock.

    Purpose of the Study:

    • To investigate the environmental factors inducing seasonal inhibition in Haemonchus contortus.
    • To determine the role of temperature and host age in larval development arrest.

    Main Methods:

    • Experimental infections of worm-free lambs with Haemonchus contortus infective larvae.
    • Exposure of larvae to chilling (+4°C) and simulated autumnal conditions.
    • Larval culture in the dark at 25°C for 12 days.

    Main Results:

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    • Chilling larvae did not affect the rate of subsequent inhibition.
    • Autumnal conditions were not necessary for inducing high inhibition rates.
    • Larval inhibition was induced by culturing in the dark at 25°C for 12 days.
    • Young host age slightly reduced larval inhibition, but was not a primary factor.

    Conclusions:

    • Seasonal inhibition of Haemonchus contortus is primarily induced by an environmental stimulus acting on preparasitic stages.
    • This stimulus is not cold, but can be replicated by dark incubation at 25°C.
    • Host age is a minor factor in the aetiology of Haemonchus contortus inhibition.