Agricultural Research Council Animal Production Institute Private Bag X2 Irene South Africa;
Faculty of Health and Environmental Sciences School of Agriculture and Environmental Sciences Central University of Technology Bloemfontein South Africa;
Agricultural Research Council Animal Production Institute Private Bag X2 Irene South AfricaDepartment of Animal Science Tshwane University of Technology Pretoria South Africa;
Extenders; Osteopontin; Boar Semen; Kolbroek; Large White;