Horak, Ivan GerardClark, R.Botha, J.C.Jansen B.C.2016-09-072016-09-0720161965Horak, IG, Clark, R & Botha, JC 1965, 'The pathological physiology of helminth infestations. 1. Ostertagia circumcincta’, Onderstepoort Journal of Veterinary Research, vol. 32, no. 1, pp. 147-152.0330-2465http://hdl.handle.net/2263/56647The articles have been scanned in colour with a HP Scanjet 5590; 300dpi. Adobe Acrobat XI Pro was used to OCR the text and also for the merging and conversion to the final presentation PDF-format.An experiment is described in which two sheep were artificially infested with 0. circumcincta and a third kept as an uninfested control. Plastic abomasal fistulae were inserted in these sheep and their erythrocytes were labelled with ⁵¹Cr. Radioactivity counts on blood and abomasal contents were done at regular intervals as well as other reactions being noted. The main findings were:- (i) No abnormal decrement in blood counts or increase in abomasal counts. (ii) An increase in abomasal pH and decrease in pepsin concentration. (iii) Anorexia and weight loss.en©1965 ARC-Onderstepoort and Faculty of Veterinary Science University of Pretoria (original). ©2016 University of Pretoria Department of Library Services (digital)Veterinary medicineVeterinary medicine -- South AfricaVeterinary helminthologyArticle