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**Haemonchosis
**Haemonchosis
== Succession of Gastrointestinal Worm Species ==
==== 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:
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
*Ability of L3 to overwinter