Willie Mullins has confirmed he has "parted company" with owner Gigginstown House Stud.
The champion trainer believes the owner opted to remove their horses from the yard after he decided to put up his fees this season.
Mullins told At The Races: "We're parting company - it's basically over fees, I imagine. I put up my fees for the first time in 10 years and Gigginstown chose not to pay them.
"That's it, we're just parting company.
"I'm not willing to try to maintain the standards I have (without putting the fees up), so that's the way it is."