Glasgow Warriors tightened their grip on Conference A of the Guinness PRO14 with a 40-20 victory over Zebre at Stadio Sergio Lanfranchi.

The bonus-point win means the Scottish side remain comfortably clear of second-placed Munster, ahead of their game against Connacht on Saturday evening.

By half-time all five points were effectively in the bag for Glasgow, with Matt Fagerson, Lee Jones and George Horne touching down in addition to a penalty try.

Jones ran in his second before Nick Grigg completed the rout of Italian outfit Zebre, who prop up the table.

Scotland back row Adam Ashe marked his comeback after a 10-week absence due to ankle surgery by setting up one of Jones' tries and Finn Russell finished with a 10-point haul.

Glasgow have won all but one of their 13 PRO14 matches this season -- losing only to Edinburgh last month -- in a run that includes 10 bonus points.