1. Department of Animal Sciences, Faculty of AgriSciences, University of Stellenbosch, Private Bag X1, Matieland, 7600 South Africa
2. Department of Livestock and Pasture Science, Faculty of Science and Agriculture, University of Fort Hare, Private Bag X1314, Alice, 5700 South Africa
3. Department of Food Science, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague 6-Suchdol, 165 00, Czech Republic
4. Department of Animal Science and Food Processing, Faculty of Tropical AgriSciences, Czech University of Life Sciences Prague, Prague 6-Suchdol, 165 00, Czech Republic