Dreyer, K.; Fourie, L.J.; Kok, D.J.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute, 1999)
Twelve Bonsmara tracer calves (aged 6-12 months) were used to monitor helminth infections in the
communal farming system of Botshabelo in the Free State. One calf was slaughtered each month
from December 1995 to November ...