“…Greasy wool from lousy sheep is more yellow (Kettle and Lukies, 1982;James et al, 2011) and less bright (Kettle and Lukies, 1982), though when scoured it has been reported that no difference in colour exists when objectively measured (James et al, 2011). SL appears to be slightly reduced by louse infestation (Wilkinson et al, 1982;James et al, 2011) although some studies report no effect (Cleland et al, 1989). The effect of louse infestation on SS remains less clear.…”