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==Gastrointestinal Nematodes ==
The important nematode infections of sheep are mostly refined to the gastrointestinal system. Clinical problems are more commonly seen in lambs than in adult sheep, though this varies with they type of nematode. They can cause substantial economic loss both in mortality and in reduced growth rate of lambs.
==Gastrointestinal Nematodes==
[[Image:Nematodirus ruminant.jpg|thumb|right|150px|''Nematodirus'' from ruminant faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
[[Image:Nematodirus ruminant.jpg|thumb|right|150px|''Nematodirus'' from ruminant faeces - Joaquim Castellà Veterinary Parasitology Universitat Autònoma de Barcelona]]
Many worm species occur in the gastrointestinal tract of sheep, though relatively few are of importance in the UK. Primary pathogens include:
Many worm species occur in the gastrointestinal tract of sheep, though relatively few are of importance in the UK. Primary pathogens include: