Farmers have employed IoT sensors, designed by smaXtec, to monitor the well-being of their farm animals. The data produced by these sensors can save farmers money by detecting illnesses as well as decreasing their workload. These devices utilize AT&T's global network and are used in many countries across the world.
https://www.notebookcheck.net/Farmers-utilize-IoT-sensors-to-observe-the-health-of-their-farm-animals.577417.0.html