Muller, G.L.Jansen, B.C.2016-07-072016-07-0720161968Muller, GL 1968, ‘The epizootiology of helminth infestation in sheep in the south-western districts of the Cape’ Onderstepoort Journal of Veterinary Research, vol. 35, no. 1, pp. 159-194.0330-2465http://hdl.handle.net/2263/54270The journals have been scanned in colour with a HP 5590 scanner; 600 dpi. Adobe Acrobat v.11 was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.1. The epizootiology of nematode parasites of sheep was investigated at the Outeniqua Experimental Farm, George, Cape Province. 2. There was a negative correlation between temperature and the availability of infective larvae on the pasture. During spring and summer when the mean average mean temperatures exceeded 20° C, low recoveries were recorded; whereas maximum recoveries were made when the mean temperature varied between 14° and 17° C in autumn and winter. 3. The major parasites at Outeniqua were Trichostrongylus spp., Ostertagia spp. and to a lesser degree H. contortus, Cooperia spp. and Nematodirus spp. 4. Flocks acquired massive worm burdens during the cooler months of the year, from autumn to spring. 5. The massive build-up of retarded fourth stage larvae and immature adults is a physiological process in the life-cycle, whereby the parasite ensures itself of optimal circumstances for survival against adverse climatic conditions.en© 1968 ARC - Onderstepoort and Faculty of Veterinary Science, University of Pretoria (original). © 2016 University of Pretoria. Dept. of Library Services (digital).Veterinary medicineThesisVeterinary medicine -- South AfricaArticle