John Ward, 67, was working with his daughter Katie, 21, to put identity tags on calves when he was attacked by a bull. She said he was thrown into the air by the bull before a cow, whose calf he was tagging, began stamping on him.
An ambulance was called to the farm in Ridgeway on the South Yorkshire-Derbyshire border on Wednesday afternoon, but Mr Ward died from his injuries.
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Hide AdYesterday, the Health and Safety Executive said it was investigating. A spokeswoman said: "We have been made aware of this incident by the police, and health and safety inspectors have been out to the site and are assisting the police with their investigation."