Equipment failure and employee negligence are being blamed for the heat-related deaths of 11 horses in Weatherford, Texas, last week.

Parker County animal control authorities discovered the horses on July 1 after a tipster reported a horse down in a pasture. County Sheriff’s Deputies discovered 10 horses dead on the 600-acre property. Another 29 horses were suffering from extreme dehydration. One horse was euthanized on the scene, said Parker County Sheriff Larry Fowler.

No charges have been filed.

The horses, all recipient mares used to carry implanted embryos, were owned by a local breeder and maintained on a leased pasture. None of the mares were in foal