Mulei, C.M.; Gathumbi, P.K.; Mbuthia, P.G.; Verwoerd, Daniel Wynand
(Published by the Agricultural Research Council, Onderstepoort Veterinary Institute ., 2000)
An outbreak of a disease characterised by very high mortality occurred in a group of nine calves (1-4 months old) in a zero-grazing unit 2-3 weeks after an introduction of an apparently healthy alien sheep into the calf ...