1. Department of Livestock and Pasture Science University of Fort Hare Alice South Africa
2. Department of Animal Sciences Stellenbosch University Stellenbosch South Africa
3. CIRAD, UMR QualiSud Stellenbosch South Africa
4. QualiSud, Université de Montpellier, CIRAD, Montpellier SupAgro, Université d'Avignon, Université de La Réunion Montpellier France