Quinlan, John; Roux, L.L.; Van Aswegen, W.G.; De Lange, N.; Du Toit, P.J.(Pretoria : The Government Printer, 1941)
(1) Ten female native goats were mated to, or artificially inseminated with
semen from a number of highly fertile sheep-rams during four breeding seasons.
(2) There was great difficulty in obtaining fertilisation, but ...