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Experiment 2
Are sheep at risk from grazing
pasture contaminated with goat-
derived IVM-resistant O.
circumcincta ?
Split the paddocks from Exp 1 into
two and crossed half goats onto
sheep pasture and vice versa
IVM resistance rapidly re-emerged
in all goat groups whether they were
previously goat or sheep paddocks
IVM resistance emerged in sheep on
goat-paddocks
level of resistance never as high
in sheep as in goats
IVM efficacy almost never < 90% in
sheep on sheep-paddocks