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Studies with an ivermectin-
resistant T. colubriformis
Found in goats but confirmed in
sheep
IVM resistance in T. colubriformis
confirmation - efficacy results
Goats 13%
Sheep 39%
also resistant to BZs (white
drenches) and probably levamisole
appears to be inherited as an
incompletely dominant character
i.e. it will quickly emerge when
introduced onto a farm as a large
percentage of worms containing the
gene(s) can survive the drench (this
is not the case for BZs or
levamisole)