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→Overview
{{Taxobox
{{Taxobox
|name =Ostertagia spp.
|name =Ostertagia spp.
|kingdom =Animalia
|kingdom =Animalia
|sub-kingdom =
|sub-kingdom =
|phylum =Nematoda
|phylum =Nematoda
|super-class =
|super-class =
|class =
|class =
|sub-class =
|sub-class =
|super-order =
|super-order =
|order =
|order =
|sub-order =
|sub-order =
|super-family =Trichostrongyloidea
|super-family =[[Trichostrongyloidea]]
|family =
|family =
|sub-family =
|sub-family =
|genus =Ostertagia
|genus =Ostertagia
|species =''O. osteragi''
|species =''O. osteragi''
}}
}}
==Overview==
==Overview==
''Ostertagia spp.'' are small bursate nematodes that parasitse the gastrointestinal tract of mammals and birds. These species are responsible for mortality and morbidity in a number of ruminants especially ''O. ostertagi'' which is widely considered the most important parasite of cattle.
''Ostertagia spp.'' are small bursate nematodes that parasitise the gastrointestinal tract of mammals and birds. These species are responsible for mortality and morbidity in a number of ruminants especially ''O. ostertagi'' which is widely considered the most important parasite of cattle.
==''Ostertagia ostertagi''==
==''Ostertagia ostertagi''==
{| cellpadding="5" cellspacing="0" border="1"
{| cellpadding="5" cellspacing="0" border="1"
| Also known as:
| Also known as:
| ''O. ostertagi''
| ''O. ostertagi''
|-
|-
|}
|}
These worms are found throughout the world, and are considered the most important parasite of cattle, especially in temperate regions. The primary host is cattle but they can also be found in deer and goats occasionally.
These worms are found throughout the world, and are considered the most important parasite of cattle, especially in temperate regions. The primary host is cattle but they can also be found in deer and goats occasionally.
====Identification====
====Identification====
==''Teladorsagia (Ostertagia) circumcincta''==
==''Teladorsagia (Ostertagia) circumcincta''==
{| cellpadding="5" cellspacing="0" border="1"
| Also known as:
| Sheep brown stomach worm
|-
|}
This is a major abomasal worm of sheep and goats, that is found worldwide. This worm is of great economical importance in both causing mortality and decreased weight gain in production animals. Resistance to all types of anthelmintics is common amongst the wild species making control and treatment difficult.
====Identification====
Adult worms have a common ostertagia appearance, slender, reddish in colour with a short buccal capsule. The worms are very short, males 6-8mm, female 8-10mm. Microscopically male ''T. circumcincta'' worms have well developed lateral lobes of the bursa and long thin spicules. In females a vulval flap is present, the tail is transversely striated and tapers to a fine rounded tip.
There are two morph species of ''T. circumcincta''; ''T. davtiani'' and ''Ostertagia trifurcata'', both of which have slightly different microscopic appearances to the ''T. circumcincta''. In males the bursa is longer in both species and the spicules, shorter and broader.
====Life Cycle====
The life cycle is the same as that of ''O. ostertagi'' described above.
====Epidemiology and Pathogenesis====
''T. circumcincta'' and ''O. trifurcata'' are responsible for clinical disease predominantly in lambs. The Pathophysiology of the disease is analogous to [[Ostertagiasis|ostertagiasis]] in cattle, though the type II form of disease is not seen as often in sheep and goats. The main feature in the epidemiology is the occurrence of a peri-parturient rise (PPR) in the number of larvae present as is seen in the disease in cattle.
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[[Category:Trichostrongyloidea]]
[[Category:Trichostrongyloidea]]
[[Category:Cattle Nematodes]]
[[Category:Cattle Nematodes]]
[[Category:To_Do_-_NickJ]]
[[Category:Sheep Nematodes]]
[[Category:Goat Nematodes]]
[[Category:To Do - Major]]
[[Category:To_Do_-_Parasites]]