Hibs Development Squad: Brennan, Dunsmore, Stirling, Waugh, Porteous, Scott (Breen, 66), Duthie (Smith, 52), Murray, Shaw, Watson, Insall. Unused substitute: Goodfellow.
Hibs, featuring Jamie Insall in assault, enhanced in the 2nd half, but a Dale Carrick header wrapped up the victory for the visitors from Ayrshire.
Before he could pull the trigger before Oli Shaw was thwarted the opening length of the game was an even contest with Adam Frizzell firing a shot on the bar.
With ten minutes Hibs came close to taking the lead. Conner Duthie ran down the right flank and Adam Hodge headed against the bar his enticing ball.
Four minutes after, Kilmarnock took the lead.
Barbour, who powered his header beyond Sean Brennan met a cross to the rear post. Aaron Scott created the riposte from Hibs. The midfielder picked out Adam Watson to the border of the box and the child volleyed at goal but Mark Ridgers was equal to his strike.
Kilmarnock grew in prominence as the game wore on with Hibs confined to counter-attacks. They got their second goal two minutes before the rest as Scott McLean’s low ball into the box was turned to the net by Porteous.
After the break, Hibs were able to create a couple of opportunities and enhanced, with Shaw seeing an effort saved from Adam Watson after great work.
In the 65th minute, a corner was headed back across goal by Frizzell and Carrick was on hand to head the ball to the net from six yards out.
Hibs worked hard in the last 25 minutes but were not able to find an avenue back into the game.