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**Ostertagiosis and Trichostrongylosis
**Ostertagiosis and Trichostrongylosis
**Nematodirosis
**Nematodirosis
**Haemonchosis[[Category:Nematodes]][[Category:Sheep]]
**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:Nematodes]][[Category:Sheep]]