To control the animal behaviour in a farrowing pen a device consisted of optical switch, electric heater-blower and an air-jet steering the air stream in determined place of farrowing pen, was designed and built. The blower was being switched on at the moment of sow standing and disconnected after the sow lying down. The optimum height of air-jet in farrrowing pens of the Strzeszyn type is 65 cm. Switching on the blower did not cause any negative form of sows’ behaviour and dislodging of the piglets was very effective, what prevented the acccidents of piglets’ crushing. The reliability of optical switch functioning was found satisfactory.
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