| 摘要 |
A pellet for administration into and reside in the rumeno-reticular sac of a ruminant and to release successive doses of an active agent, such as an anthelmentic, comprises an assembly (10) of discs (12) each having a peripheral skirt (14) on one side and an inwardly-spaced skirt (16) on the other so that such discs can interfit by said skirts (14, 16) and define therebetween cavities (18) each containing a respective active agent dose (24). A weighting slug (20) is provided at one end of the assembly (10) which is enclosed except at one end by a surrounding plastics sheath (26) so that rumen juices may attack and erode the successive discs (12) to release the successive doses (24). The discs (12) are of a magnesium-based alloy and the slug (20) is of a Zinc-based alloy. |
