Studies on Haemonchus contortus. IV. The effect of Trichostrongylus axei and Ostertagia circumcincta on challenge with H. contortus
Reinecke, R.K.; De Villiers, I.L.; Bruckner, Christel; Steyn, P.J.J.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B.
Worm-free Merino yearlings were dosed with either a mixture of infective larvae of Trichostrongylus
axei and Ostertagia circumcincta or with O. circumcincta only, and challenged 90-93 days
later with infective larvae of Haemonchus contortus. Neither of these methods protected sheep against
challenge and slight protection was afforded sheep predosed with T. axei and O. circumcincta and
challenged with a trickle dose of H. contortus.
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