Galway trainer Stephen Mahon has been banned from training for four years by the Irish Horseracing Regulatory Board.
Mahon was found to have breached rules relating to animal welfare and proper supervision by an Irish Horseracing Regulatory Board Referrals Committee panel, which released its verdict on Thursday.
An inspection took place at Mahon's stable in Kilcolgan on 13 April, after which the trainer had his licence suspended.
The panel said there were "multiple and widespread failures to secure the welfare of animals" at Mahon's stables.
The panel heard over 16 hours of evidence from a total of 13 witnesses.
During evidence, the panel heard how one horse, referred to in the report as Animal A, had to be put down on the day of the inspection due to what was described as a "catastrophically injured" fetlock joint.
The panel were told that the day before the inspection, Animal A had been entered to run in Ballinrobe later that week.
Another horse in Kilcolgan was reported to be "emaciated". In total, the panel documented failings relating to 11 horses, including seven that were found to be inadequately cared for in the field.
Mahon has been banned from training for four years until 14 April 2025, the longest ever penalty handed out to a trainer in Ireland.
They accepted that Mahon showed remorse but withdrew his licence and was ordered to pay €5,000 in legal costs to the IHRB.
The panel was chaired by Justice Tony Hunt.
It is the second time that Mahon has been punished by the IHRB for neglect of animals within his care.
In 2008, his licence was suspended for four months and the Circuit Civil Court ordered him to pay €34,000 to the owner of Pike Bridge.
The court found that the thoroughbred had been neglected to such an extent that it had to be put down humanely to stop unnecessary suffering. Though the IHRB found no evidence of cruelty to the horse, it referred to a "complete disregard of the procedures for the ordinary running of a licensed stable."
