摘要 |
The invention described is a bolus for the controlled release of a beneficia l agent in the rumen of a ruminant animal. The bolus consists in a core containing a binder, solubilising agent, the beneficial a gent to be released and, when required, a densifier. The core is coated with a wax coating preferably with an opening exposing a small part o f the core to rumen juices. The core is gradually dissol ved releasing the beneficial agent. As the core dissolves the wax coating crodes until the bolus disappears completely.
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