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Bankrupt Worm Print E-mail
Written by Administrator-GL   
Thursday, 17 July 2008
Trichostrongylus axei

This is a very tiny worm - 4 to 7 mm.
Most commonly occurs in areas of rainy winters.
Goats are often infected when first released into pastures in spring after being in confinment.
Young animals are most susceptible but infection can also occur in older animals.
Commonly brought on by stress such as moving.
Signs of infection are minimal until a high level of worms are present.

bankrupt worm
Adult Bankrupt Worm

life cycle
Life Cycle
(click on image to enlarge)

Images from University of Pennsylvania 2003
Life Cycle
Stage 1: Eggs are deposited in feces.
Stage 2:Develop quickly and can hatch in 20 hours in summer months, which are already in a 16 to 32 cell stage.
If the eggs dry out before they hatch, they become dormant and can survivie for up to 15 months.
Stage 3: Molt into L3, which is the infective stage.
These 3rd stage larvae are capable of living through rainy and mild winters
Stage 4: Stage 3 larvae are ingested with grass in infected pastures , migrate to the abomasum wall and develop into L4 . They leave the wall of the abomasum and live freely in the lumen where they become adults and begin laying eggs in 21 days after infection.
All other species of the genus Trichostrongylus live in the intestine. T. axei is the only one that lives in the abomasum.
Infectious stage: 3 to 4 days
(Minimum number of days for parasite to reach infectious larval stage)
Prepatent period 14 to 25 days.
Prepatent - Period of time between introduction into the body and apparent symptoms
Site of Infection: Abomasum

Symptoms of Infection:
  1. Typically symptoms do not appear unless there is heavy infestation
  2. Severe gastritis
  3. Soft Feces, not always scouring
  4. Extreme infestations have scouring that is blackish green and will lead to emaciation
  5. Decreased appetite
  6. Impaired digestion
  7. Extremely severe infestations you "may" see bottlejaw.
  8. Protein loss but not neccesarily anemia.

bankrupt egg
This is a Strongyle type egg and are not distinguishable from other gastrointestinal nematodes that produce similar eggs.

    Post Mortem (Necropsy) Findings:
  • In the abomasum nodular lesions containing developing worms may be seen upon careful examination.
    These are formed by the L3 stage larvae exsheathing and penetrating the mucosal surfaces of the abomasum.
Additional Information: The Parasite

Last Updated ( Thursday, 17 July 2008 )
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