Difference between revisions of "Category:Sheep Nematodes"

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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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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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{| style="width:75%; height:200px" border="1"
 
  
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!'''Abomasum'''
 
!'''Small Intestine'''
 
!'''Large Intestine'''
 
  
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|'''Primary Pathogens in the UK'''
 
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*''Ostertagia (Teladorsagia) circumcincta''
 
  
*''Haemonchus contortus''
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[[Category:Sheep Parasites]]
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*''Trichostrongylus'' species
 
 
 
*''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
 
 
 
*''Cooperia'' species
 
 
 
*''Bunostomum'' species
 
 
 
*''Strongyloides'' species
 
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*''Oesophagostomum'' species
 
 
 
*''Chabertia'' species
 
 
 
*''Trichuris'' species
 
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*All the above worms belong to the '''Trichotrongyloidea''' except:
 
**''Bunostomum'' (a hookworm)
 
**''Oesophagostomum''
 
**''Chabertia'' (Strongyloidea)
 
**''Strongyloides'' (Rhabditoidea)
 
**''Trichuris'' (a whipworm)
 
*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:
 
**Ostertagiosis and Trichostrongylosis
 
**Nematodirosis
 
**Haemonchosis
 
 
 
== Succession of Gastrointestinal Worm Species ==
 
The relative number of worms of each species changes during the grazing season. The succession of species is due to differences in:
 
*Ability of L3 to overwinter
 
*Fecundity between worm species
 
*Rate of development from egg to L3 stage
 
*Special requirements of ''Nematodirus''
 
 
 
 
 
[[Category:Sheep]]
 
[[Category:To_Do_-_Parasites]]
 

Latest revision as of 14:58, 21 January 2011