Animal activity in pigs can be a direct indicator of animal welfare. Passive infrared detectors (PID) provide one method of measuring animal activity on the pen level as a cost-effective and easy-to-use sensor technique. The study aimed to test PIDs on different commercial farms with fattening pigs. https://www.bekindtopets.com/limited-price-Sensationnel-Cloud-9-What-Lace-Glueless-Swiss-13x6-HD-Lace-Front-Wig-KIYARI-hot-buy/