Reinecke, R.K.De Villiers, I.L.Bruckner, ChristelBigalke, R.D.Cameron, Colin McKenzieGilchrist, Frances M.C.Morren, A.J.Verster, Anna J.M.Verwoerd, Daniel WynandWalker, Jane B.Steyn, P.J.J.2016-03-152016-03-1520161981Reinecke, RK, Bruckner, C & De Villiers, IL 1981, 'Studies on Haemonchus contortus. IV. The effect of Trichostrongylus axei and Ostertagia circumcincta on challenge with H. contortus’, Onderstepoort Journal of Veterinary Research, vol. 48, no. 4, pp. 229-234.0330-2465http://hdl.handle.net/2263/51872The articles have been scanned in colour with a HP Scanjet 5590; 600dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.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.en©ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). ©University of Pretoria. Dept. of Library Services (digital).Veterinary medicineVeterinary medicine -- South AfricaArticle