We were never going to get any calls Blues coach Dai Young

"We feel hard done by, playing in Ireland with Irish officials, the league should look at it," said Young.

Young saw John Yapp, Scott Morgan and Martyn Williams sin-binned as his side crumbled after a promising start.

The Blues were unhappy with a number of other decisions, including an Andrew Trimble try from an offside position.

"I have to watch what I say, but we won't be too disappointed if we don't have Andy Ireland officiating us again," said Young.

The officials were appalling, inept and spineless, and they bottled the crucial decisions Ex-Wales captain Ieuan Evans

"My players were yellow carded on the advice of the linesmen, we were never going to get any calls."

Yapp was sin-binned in a case of mistaken identity after Tom Shanklin indulged in some exuberant footwork at a ruck, while Scott Morgan was singled out for punching after a mass melee.

Replacement Williams saw yellow for dissent, losing his cool after feeling he had a good try disallowed - and then seeing Ulster immediately score a try at the other end that the Blues felt should have been disallowed.

"Martyn's frustration just boiled over," Young told BBC Sport Wales.

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"In all the years he's been playing I've never seen him react like that before, he was really upset by the decisions."

Young's comments were supported by former Wales captain Ieuan Evans.

"The officials were appalling, inept and spineless, and they bottled the crucial decisions," the former Lions wing told BBC Wales' Scrum V rugby programme.

"I don't think it affected the result, but it affected the scoreline.