Reinecke, R.K.De Villiers, I.L.Bruckner, ChristelBigalke, R.D.Cameron, Colin McKenzieGilchrist, Frances M.C.Jordaan, E.Morren, A.J.Verster, Anna J.M.Verwoerd, Daniel WynandWalker, Jane B.Steyn, P.J.J.2015-12-072015-12-0720151982Reinecke, RK, De Villiers, IL & Bruckner, C 1982, 'Studies on Haemonchus contortus. VI. Attempts to stimulate immunity to abomasal trichostrongylids in Merino sheep’, Onderstepoort Journal of Veterinary Research, vol. 49, no. 1, pp. 3-6.0330-2465http://hdl.handle.net/2263/51091The 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.Two doses of infective larvae of 20 000 Trichostrongylus axei, dosed to Merino lambs at an interval of 14 days and subsequently challenged with Ostertagia circumcincta, caused a significant reduction (P < 0,01) in the establishment of 5th and adult stages of the latter. T. axei was unable to protect Merino sheep against homologous challenge nor was Haemonchus contortus a successful vaccine against challenge with the same species. The vaccinated group showed a reduction (P < 0,025) only in 5th and adult H. contortus, but not in the total worm burdens.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