Odendaal, M.W.; Pieterson, P.M.; De Vos, Valerius; Botha, A.D.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Du Plessis, D.H.; Van Wyngaardt, Wouter; Gerdes, Gertruida Hermanna; Opperman, E.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Spickett, Arthur M.; Burger, D.B.; Crause, J.C.; Roux, Elizabeth M.(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Kellerman, T. Stephanus; Schultz, R.A. (Rowena Anitra); Rabie, C.J.; Van Ark, H.; Maartens, B.P.; Lubben, Annelie(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)
Zandbergen, Thijs A.; Van de Wiel, Paul A.; De Groot, Mia; Uilenberg, Gerrit(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)