Embodiments disclosed herein include devices for time release of measured quantities of an active ingredient and storage of animal management information. One embodiment disclosed herein releases an active ingredient, which is useful in the ruminant art, within the rumen and, then, at optionally varied intervals, releases additional doses into the same environment. The active ingredients are compartmentalized and, upon receiving an appropriate signal, use a magnetic field to expel the active ingredient into the rumen of the animal. The doses of active ingredient may be delivered simultaneously, sequentially, or independently. Further, the doses of active ingredient may be the same active ingredient or different active ingredients, in any formulation. Another embodiment described herein stores animal management information, such as identification or dosage information, and wirelessly communicates the stored information to an external device.
