Observations on Artificial Infestation of Sheep with Fasciola hepatica and on A Phase in the Development of the Parasite

Abstract

By the close of the winter of 1925–26, the author's investigations into the value of certain drugs in the treatment and control of liver rot of sheep had reached a stage when it was felt that further advancement in certain important directions necessitated the employment of sheep subjects which had become infested with Fasciola hepatica to a known degree at a particular time. Naturally infested sheep were unsuitable, since observation had demonstrated a great variation—as regards both extent and type—in the infestation of sheep of the same flock.