Clinical Parasitology Haemonchus contortus .docx

Of sheep and goats are susceptible to haemonchosis

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of sheep and goats are susceptible to haemonchosis, recently weaned animals are usually the most vulnerable. Different factors besides age that increase susceptibility include overgrazing, dense stocking rates, and inadequate nutrition, notably protein intake.
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This roundworm like most are i nfective at the L3 larvae stage where it is ingested by the host on pasture then it develops into adults in the abomasum and produce eggs that are passed in the feces. The eggs hatch while in the feces and undergo two molts, resulting in L3 larvae, which have the ability to migrate up blades of grass in drops of moisture. In the right conditions, it takes only 3-4 days for an egg deposited in feces to develop to L3 stage. Depending on temperature and moisture, L3 larvae can survive on pasture up to 6 months. Adult’s worms can become dormant inside the sheep or goat for several months. They resume activity when external environmental conditions become more amicable, for instance at beginning of spring, or when ewes and does have lowered resistance to worms, around lambing and kidding and until 8 weeks after parturition. Even moderate infections of Haemonchus contortus can have an effect on milk production of ewes and does leading to a problem of growth in their lambs and kids. Clinical signs can be faint when it comes to H. contortus , the most common signs are failure to thrive and weight loss. As the worms increase, more severe signs, such as
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  • Spring '14
  • GeorgeW.McCommon
  • Nematode, Haemonchus contortus, Barber's pole

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