Reinecke, R.K.; De Villiers, I.L.; Bruckner, Christel; Bigalke, R.D.
(Published by The Government Printer, Pretoria, 1984)
Four groups of 6-7-month-old Merino lambs were each dosed with 40 000 infective larvae of Trichostrongylus
axei on 2 November 1976 and subsequently exposed to challenge with Haemonchus contortus on natural
grazing at ...