A police investigation is under way after 10 in-calf cows were killed in a suspected poisoning.
Wiltshire Police said the distraught farmer discovered the cows lying dead in a barn containing 67 beef cattle.
The incident happened on a farm near the rural village of Ham sometime between 27 and 28 April.
Detectives believe the animals’ water supply may have been contaminated with an “unknown poisonous substance”.
It is believed the poison was added to water troughs last week and officers have appealed to the farming community for help to solve the mystery.
John Bordiss, a police community support officer (PCSO), of Wiltshire Police’s rural crime team, said in a text alert: “Between 27th and 28th April an unknown poisonous substance was added to water troughs within an open barn containing 67 in calf beef cattle.
“By Friday morning 10 were dead along with unborn calves. Clearly upsetting for all involved.”
Anyone with information is urged to call Wiltshire Police on 101 or Crimestoppers anonymously on 0800 555 111.