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| − | == Nematodes of Sheep - Gastrointestinal Nematodes == | + | {{frontpage |
| − | [[Image:Nematodirus ruminant.jpg|thumb|right|150px|''Nematodirus'' from ruminant faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
| + | |pagetitle = Sheep Nematodes |
| − | Many worm species occur in the gastrointestinal tract of sheep, though relatively few are of importance in the UK. Primary pathogens include:
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| | + | <categorytree mode=pages>Sheep Nematodes</categorytree> |
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| − | !'''Abomasum'''
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| − | !'''Small Intestine'''
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| − | !'''Large Intestine'''
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| − | |'''Primary Pathogens in the UK'''
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| − | *''Ostertagia (Teladorsagia) circumcincta''
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| − | *''Haemonchus contortus''
| + | [[Category:Sheep Parasites]] |
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| − | *''Trichostrongylus'' species
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| − | *''Nematodirus battus''
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| − | |'''Worms that contribute to ovine PGE, but are rarely primary pathogens in the UK'''
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| − | *''Trichostrongylus axei''
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| − | *other ''Nematodirus'' species
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| − | *''Cooperia'' species
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| − | *''Bunostomum'' species
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| − | *''Strongyloides'' species
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| − | *''Oesophagostomum'' species
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| − | *''Chabertia'' species
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| − | *''Trichuris'' species
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| − | *All the above worms belong to the '''Trichotrongyloidea''' except:
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| − | **''Bunostomum'' (a hookworm)
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| − | **''Oesophagostomum''
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| − | **''Chabertia'' (Strongyloidea)
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| − | **''Strongyloides'' (Rhabditoidea)
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| − | **''Trichuris'' (a whipworm)
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| − | *Although many different genera and species of worms may be found in the gastro-intestinal tract of sheep there are only three distinct disease manifestations within the [[Parasitic Gastroenteritis|PGE]] complex:
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| − | **Ostertagiosis and Trichostrongylosis
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| − | **Nematodirosis
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| − | **Haemonchosis
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| − | == Succession of Gastrointestinal Worm Species ==
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| − | The relative number of worms of each species changes during the grazing season. The succession of species is due to differences in:
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| − | *Ability of L3 to overwinter
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| − | *Fecundity between worm species
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| − | *Rate of development from egg to L3 stage
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| − | *Special requirements of ''Nematodirus''
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| − | [[Category:Nematodes]][[Category:Sheep]]
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