Ok I totally misread the title as "... cow dollars" and thought this was going to be some commodity trading blockchain with a proof-of-livestock scheme. That might actually be able to work using these collars. It would be really cool if the farms of the future were doing something like automated silviculture using robotic judas goats and electronically-controlled gates to herd the animals from one area to another. A roomba-type robot could follow along and collect fecal samples to monitor for parasites and diseases.