The top two teams in Conference A in the Pro14 were in fine form on Friday as they enjoyed comprehensive victories.
Owen Farrell missed Saracens' Champions Cup win over Glasgow Warriors as his wife went into labour before kick-off.
Johnny Sexton will not be risked for Leinster's Champions Cup quarter-final, but Maro Itoje and Stuart Hogg are set to return this weekend.
Bonus-point wins for Glasgow Warriors and Munster mean the top two in Conference A remain three points apart.
Wales international Leigh Halfpenny featured in the Scarlets' 10-6 win over Munster, while Glasgow Warriors went top of Conference A.
Glasgow Warriors closed the gap on Munster at the top of Conference A, despite both recording wins in the latest round of Pro14 fixtures.
Gregor Townsend has added six players to Scotland's squad ahead of the France Six Nations trip, but Stuart Hogg is out.
Zebre put on a spirited showing but ultimately fell short against Pro14 heavyweights Leinster.
Having lost Ryan Wilson for the rest of the Six Nations earlier this week, Scotland may also have to cope without Huw Jones.
Gregor Townsend is optimistic there will be good news on Stuart Hogg's shoulder injury when he visits a specialist.
Ryan Wilson will play no further part in the Six Nations, while Stuart Hogg and Huw Jones will be assessed this week.
Benetton Treviso's winning run was ended at five matches as Ulster earned a dramatic draw in the Pro14.
Saracens and Racing 92 secured home quarter-finals in the Champions Cup but the hopes of Exeter Chiefs are over after defeat at Munster.
Both Edinburgh and Glasgow Warriors are through to the European Champions Cup quarter-finals due to the former's 19-10 win over Montpellier.
Premiership champions Saracens are through to the last eight of the European Champions Cup after beating Lyon on Sunday.
Munster moved top of Pro14's Conference A after capitalising on Glasgow Warriors' defeat to in-form Benetton Treviso.