I did find this. "... the animal owner would be required to report: the birthdate of an animal, the application of every animal’s ID tag, every time an animal leaves or enters the property, every time an animal loses a tag, every time a tag is replaced, the slaughter or death of an animal, or if any animal is missing. Such events must be reported within 24 hours." From http://www.countrysidemag.com/90-1-mary-zanoni
I would argue that this is burdensome and easier to rationalize for an urbanite. Also note that they likely didn't consider how small farmers will often arrange to have their animals graze on a neighbor's field, which would mean logging entry and exit twice a day.