George Horne crossed for two first-half tries as Glasgow eased to a 31-7 Guinness PRO14 victory over Zebre at Stadio Sergio Lanfranchi.

Glasgow Warriors counted the cost of missing World Cup stars as their Guinness PRO14 campaign opened with a 48-14 defeat to the Cheetahs.

Scrum-half Nick Frisby has given the game away.

Queensland Reds 12 British and Irish Lions 22