In a flock of Corriedale ewes 2 lines, selected entirely on the basis of the predictive test, demonstrated predicted levels of fleece yellowness when conditions promoted high levels of discoloration. Assessed greasy and measured scoured wool yellowness were not highly correlated. The yellowness value of HS fleeces increased on storage of greasy fleeces. There was a negative correlation between yield and susceptibility, which was not strong enough to use for predictive purposes. Pilocarpine hydrochloride was administered to the housed sheep to determine whether fleece yellowing and related faults were caused by excessive sweating.
Results are variable.