A device for monitoring the health, fertility and/or well-being of a pig. The invention concerns a device for monitoring the health and/or condition of a pig intended to be rigidly connected to an ear of said pig. According to the invention, such a device comprises, in particular: - means for measuring acceleration components of said device along three orthogonal axes - means for measuring, by infrared means, the temperature of a portion of said ear - means for optical luminescence measurement forming an oximeter intended to measure the oxygen saturation of the blood flowing in said ear - means for processing said measurement of the acceleration components, said temperature measurement and said measurement of the oxygen saturation of the blood flowing in said ear comprising: - means for determining the position and/or a movement and/or the standing still and/or an ingestion and/or the mounting and/or the respiration rate and/or the level of activity of said pig from said measurement of the acceleration components - means for determining the heart rate of said pig from said measurement of the oxygen saturation of the blood flowing in said ear - means for determining a body temperature of said pig from said temperature measurement and clock data in order to take into account the temperature circadian rhythm of said pig.Dispositif de surveillance de la santé, de la fertilité et/ou du bien-être dun porcin Linvention concerne un dispositif de surveillance de la santé et/ou de létat dun porcin destiné à être solidarisé à une oreille dudit porcin. Selon linvention, un tel dispositif comprend notamment: - des moyens de mesure des composantes de laccélération dudit dispositif selon trois axes orthogonaux - des moyens de mesure par infra-rouge de la température dune portion de ladite oreille - des moyens de mesure optique par luminescence formant un oxymètre destinés à mesurer la saturation en oxygène dans le sang circulant dans ladite oreille - des moyens de traitement de la
