I am always interested in Internet of Things applications in agriculture, and I recently read about the MooMonitor on independent.ie. They claim that the MooMonitor can keep tabs on cow health, fertility, and heats.
My question is, how does the MooMonitor keep tabs on a cow being in heat? Is it simply physical comportmental difference from the norm that it is detecting, or is there something else it actually measures, like body temperature? Also, does it take the 3 week cycle into account to help predict when to look for differences in whatever signs it is looking for?