https://repository.up.ac.za/handle/2263/21238
https://repository.up.ac.za/handle/2263/69167
https://repository.up.ac.za/handle/2263/7463
https://repository.up.ac.za/handle/2263/7323
https://repository.up.ac.za/handle/2263/90397
https://repository.up.ac.za/handle/2263/89828
https://repository.up.ac.za/handle/2263/76027
https://repository.up.ac.za/handle/2263/6041
https://repository.up.ac.za/handle/2263/80
https://repository.up.ac.za/handle/2263/14177
https://repository.up.ac.za/handle/2263/74403
https://repository.up.ac.za/handle/2263/6851
Published in the ‘Onderstepoort Journal of Veterinary Research’ vol 76(1) 2009. https://ojvr.org/index.php/ojvr/issue/view/6