Comparative life cycles:
Traits
Ostertagia  spp
Haemonchus spp
Trichostongylus  spp
        Exshetment
In rumen
In rumen
In abomasums
       Moulting
In Mucosal  gland
Close apposition to mucosal  gland
Subepithelial tunnel.
        PPP
3  weeks
2-3  weeks
2-3  weeks

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