De Ruyck, An M.C.Van Ark, H.Bigalke, R.D.2014-10-072014-10-0720141988Huchzermeyer, FW, De Ruyck, AMC & Van Ark, H 1988, 'Broiler pulmonary hypertension syndrome. III. Commercial broiler strains differ in their susceptibility', Onderstepoort Journal of Veterinary Research, vol. 55, no. 1, pp. 5-9.0330-2465http://hdl.handle.net/2263/42273The 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.Broilers of 4 different commercial strains were kept during winter at an altitude of 1 350m. The birds were slaughtered at weekly intervals and their relative right ventricular mass (pulmonary arterial pressure index = API values) determined. In addition, the incidence of ascites was recorded. Two of the strains suffered high losses from ascites, while the other 2 showed a certain degree of resistance. The former 2 groups had a higher mean API and a greater percentage of high API values in clinically normal birds than the other 2 groups. The group with the lowest incidence of ascites achieved the highest mean live mass at 51 days. There was also a decrease in mean API with age in clinically normal birds. There was no difference in the incidence of ascites between males and females.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