by Van Niekerk, F.E. (Stellenbosch Univ. (South Africa). Dept. of Human and Animal Physiology), Cloete, S.W.P, Heine, E.W.P, Van der Merwe, G.D, Wellington, A, Du Plessis, S.S, Bekker, D
Published in Journal of the South African Veterinary Association (01.12.1996)