Reinecke, R.K.De Villiers, I.L.Joubert, GerdaBigalke, R.D.2015-10-192015-10-1920151984Reinecke, RK, De Villiers, IL & Joubert, G 1984, 'Studies on Haemonchus contortus. X. The effect of Trichostrongylus axei in Merinos on artificial pastures', Onderstepoort Journal of Veterinary Research, vol. 51, no. 1, pp. 33-39.0330-2465http://hdl.handle.net/2263/50251The 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.A recently established Eragrostis curvula pasture 1, 1 ha in size at Hennops River in the Transvaal Highveld was contaminated from 6 October 1976 until 20 May 1977 by 30 weaned Merinos, each infested with 7 000 infective larvae of H. contortus. On 2 November 1976 3 groups of weaned Merinos and again on 10 January 1977 a further group of Merinos were infested with 40 000 infective larvae of Trichostrongylus axei. From 19 November a single group of sheep, predosed with T. axei, and a control group grazed with the seeders for 8 weeks. After 6 weeks another group of sheep dosed with T. axei grazed with them, thus ensuring a 2-week overlap. This continued until autumn, when the last groups were removed. Efficacy against challenge reached Class C (>50% effective against total worm burdens of H. contortus in >50% of sheep) in early summer and autumn, but only reached significant levels of either P<0,01 or P<0,05 in summer. Peak worm burdens in controls were recorded in early autumn.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