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Goat Holiday Goodies
BarberPole Worm Print E-mail
Written by Administrator-GL   
Thursday, 17 July 2008
BARBERPOLE WORM
Haemonchus contortus
Haemonchus placei-
occurs in cattle



Said to be THE goat Killer of worms!
Can kill host (goat) in as little as 2 to 3 weeks.
Have the ability to lay dormant in abomasum for several months doing no damage to the host (goat) at this time.
When the weather warms up they become active and do great damage
this is called Arrested Development or Hypobiosis.
Voracious blood suckers.
Females are extremely prolific egg layers, capable of laying 5,000 eggs daily
Young animals and females 30 days prior to and 30 days after kidding are the most vulnerable.
Hormonal changes in the pregnant female will send signals to the female worm which triggers massive numbers of eggs to be shed at about the same time the kid is born.. this is called periparturient rise

barberpole worm
(click to enlarge image)
Adult worm showing 'barberpole' coloring
Photo Credit: Ed Munn

h placei
(click to enlarge image)
Showing mouth

Haemonchus sp
Haemonchus sp.
This nematode is common in the abomasum of sheep, goat, cattle, and other ruminants.
Size 20 to 30 mm (this is the largest of the abomasal trichostrongyles)
Photo credit: University of Pennsylvania


Life Cycle
Stage 1: Eggs are shed in feces.
Stage 2:Larvae 1 (L1) hatches in 1-2 days
They feed on feces and develop into Stage 2 larvae (L2) which are still in sheath, and then to Stage 3 larvae (L3)
Stage 3: Ingested with grass in pastures.
Stage 4: Sheath is cast off in abomasum and this is where they will molt 2 or 3 more times.
Young adults (L4) and adults both feed on blood in abomasum.

Infectious stage: 4 to 6 days
(Minimum number of days for parasite to reach infectious larval stage)
Prepatent period 2 to 3 weeks.
Prepatent - Period of time between introduction into the body and apparent symptoms
Site of Infection:
ABOMASUM

Symptoms of Infection:
  1. Constipation is more common than scours.
  2. Minimal scouring, if any.
  3. Weakness
  4. Lethargy
  5. Chronic Weight Loss
  6. Severe anemia
  7. Hypoprotenemia, bottle jaw and edema in ventral abdomen (underbelly)
  8. Unthriftyness
  9. Dull hair coat, thinning hair on fiber goats
  10. Reduction in milk
  11. Anorexia (loss of appetite)

EGG:
barberpole egg

    Post Mortem (Necropsy) Findings:
  • Severe damage to abomasonal walls
  • Adult worm masses in abomasum
  • Areas of hemorrhage, where worm has attached itself
  • Fluid in mediastinum (space between organs)
  • HyperAcute haemonchosis - necropsy findings will show as many as 20,000 to 50,000 worms in abomasum
  • Acute haemonchosis - findings will show 2,000 to 20,000 worms and contents of abomasum will be brown due to the presence of blood.
Here is a good example of fluid in the body cavity caused by worm infestation as seen upon necrospy

Click to enlarge


Here is an example of H. Contortus in the abomasum upon necropsy
Haemonchus species are the largest of the nematodes found in the abomasum of ruminants (10-30mm).
H. contortus in abomasum
Click to enlarge
Photo credits: University of Pennsylvania

Additional Information:
BarberPole Worm.
The Parasite


Last Updated ( Thursday, 17 July 2008 )
 
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