Trichostrongyloidea - The Veterinary Site

Trichostrongyloidea


TRICHOSTRONGYLOIDEA(Superfamily)
(by MAAZ AHMED
SIDDIQUI)
       CHARACTERISTICS
       The trichostrongyloides are small, often hair like, worms which, with the exception of lung worm Dictyocaullus, parasitize the alimentary tract of animals and birds.
       The males have a well developed bursa and two spicules.
       The life cycle is direct and usually non migratory and the L3 is the infective stage.
       The trichostrongyloids are responsible for considerable mortality and widespread morbidity, especially in ruminants.
Genera
       The most important alimentary genera are
        Ostertagia
        Haemonchus
        Trichostrongylus
        Cooperia
        Nematodirus
        Hyostrongylus
        Marshallgia
        Mecistocirrus
Genus: OSTERTAGIA
       This genus is the major cause of parasitic gastritis in ruminants in all over the world.
       Host
            Ruminants
       Site
            Abomasum
       Disease Name
            Ostertagiasis
       Ostertagia ostertagi
                                                                Cattle
       Ostertagia circumcincta
                                                                 Sheep and goats
       Ostertagia trifurcata
                                                                Sheep and goats
LIFE CYCLE
      Direct life cycle
      Adults in the abomasum lay eggs that pass in feces
      Larvae undergo two molts to become infective third-stage larvae
      Migrate onto herbage and ingested by grazing cattle
      Once ingested, these parasitic larvae grow and molt twice more to become egg-laying adults.
       Environmental conditions of cold or excessive dryness may trigger a condition known as hypobiosis,
      In which larval development is arrested so that maturation may take several months
      Prepatent period is 17 to 21 days.


Trichostrongyloidea Trichostrongyloidea Reviewed by Maaz ahmed siddiqui on 08 May Rating: 5

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