voorbokn.

1913 C. Pettman Africanderisms 540 Voorbok... A goat..is generally used on South African sheep-farms, instead of a bell-wether as in England.

1947 Cape Argus 29 Mar. 6 Many English-speaking South Africans regarded him as a man wielding a moderating influence upon racial politics. Why then should he not be useful as a bell-wether (‘voorbok’) leading United Party sheep into the Herenigde kraal?

1951 Cape Times 15 Aug. 2/6 A delivery van ran into a flock of sheep.., killing 25 sheep and the voorbok.

1972 Daily Dispatch (East London, S. Afr.) 6 May 10 It reminds me of days long ago when farmers trekked their sheep from the Free State to the better winter grazing of the Natal lowveld. Each flock was led by a goat, the voorbok. The sheep..would never cross a river or enter a gate unless led by the more clever voorbok.

1976 Evening Post (Port Elizabeth) 20 Nov. The woman..was described in court as one of the ‘voorbokke’ of the riots who incited children to throw stones at White people's cars.