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== Nematodes of Sheep - Gastrointestinal Nematodes ==
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[[Image:Nematodirus ruminant.jpg|thumb|right|150px|''Nematodirus'' from ruminant faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
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|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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{| style="width:75%; height:200px" border="1"
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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''
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[[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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