Van der Westhuizen, L.; Magwaba, T.; Grobler, J.P; Bindeman, H.; Du Plessis, C.; Van Marle-Koster, Este; Neser, F.W.C.(South African Society for Animal Science, 2019-04-11)
Petzer, Inge-Marie; Donkin, Edward Francis; Du Preez, E.; Karzis, Joanne; Van der Schans, Theodorus J.; Watermeyer, Johanna C.; Van Reenen, R.(Agricultural Research Council, ARC-OVI and the University of Pretoria, 2008-06)