| 摘要 |
A structural element (2), suitable for use in the manufacture of a release device for intraruminal administration of an active agent to a ruminant animal, is of a compacted material, which material comprises a mixture of powdered iron, graphite and optionally copper, the graphite being present in the mixture in an amount of from 2 to 7 wt %, the copper in an amount of from 0 to 5 wt % and the iron in an amount of from 88 to 98 wt %, by weight of the total weight of iron, copper and graphite. A plurality of structural elements (2) may be assembled to provide a structural unit (4) of a release device.
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