Du Plessis, J.L.Bigalke, R.D.2015-11-132015-11-1320151984Du Plessis, JL 1984, 'Colostrum-derived antibodies to Cowdria ruminantium in the serum of calves and lambs', Onderstepoort Journal of Veterinary Research, vol. 51, no. 4, pp. 275-276.0330-2465http://hdl.handle.net/2263/50460The 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.Antibodies to Cowdria ruminantium were detected in the serum of calves born from artificially immunized heifers, by means of the indirect fluorescent antibody test, only for as long as 4 weeks after birth. Lambs born from artificially immunized ewes, however, were still serologically positive at 8-12 weeks of age. Much higher antibody titres were recorded in the sera of ewes and their lambs than in that of heifers and their calves.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