Fifth generation cattle farmers David and Melita Smith have developed a device they liken to a "Fitbit for cows" in an attempt to help farmers keep track of their livestock.

"We thought we have to do things better than we have, and the only way we can do that is with data," says David Smith. "You really need to know where your animals are and what condition they are in."

The pair co-founded startup Ceres Tag in 2016 and have developed a smart ear tag which produces similar data to that delivered by consumer smart watches.

Ceres Tag has developed a Fitbit like device to get cows moo-ving.

Drawing on their backgrounds in engineering and education the device uses GPS to track positioning, accelerometers to monitor movement and measures temperature to track the cow's health.