infestation of tracer lambs by fasciola hepatica in tunisia: determining periods for strategic anthelmintic treatments.ovine fasciolosis causes high morbidity and mortality rates, resulting in large economic losses to the sheep industry in northern tunisia. the authors surveyed ovine fasciolosis (fasciola hepatica infestation) in a barbarine sheep flock in the humid region of tunisia (sejnane, governorate of bizerte) over two consecutive years, 2004 to 2005. to assess the dynamics of fluke infestation, a total of 36 tracer lambs were introduced into the flock successively, in groups of three, every two months, a ...201122435202
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