Reinecke, R.K.Verwoerd, Daniel Wynand2014-09-302014-09-3020141989Reinecke, RK 1989, 'Overberg Research Projects. IV. The development of resistance to Nematodirus in lambs and spontaneous cure of Teladorsagia in weaners', Onderstepoort Journal of Veterinary Research, vol. 56, no. 1, pp. 81 - 84.0330-2465http://hdl.handle.net/2263/42147The 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.Soon after 12-week old suckling lambs reached a peak infestation of Nematodirus resistance developed, worm burdens falling by 43,1-97,5% in 18 week and 11-month old sheep respectively. Both Teladorsagia (syn. Ostertagia) and Trichostrongylus reached a peak geometric mean (G) of 18 099 and 3 278 worms on 02 December 1987 in weaners 5-6 months old. Within 6 weeks--6 months of sheep grazing on safe pastures, spontaneous cure of Teladorsagia occurred, worm burdens falling by 77,3-98,7 % but not of Trichostrongylus which was only reduced by 34-40%.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