Pro14 Dave Kearney hat-tricks helps PRO14 finalists Leinster see off Zebre
.Dave Kearney scored a hat-trick of tries as Leinster recorded a 48-31 victory over Zebre in Parma.
Defending champions France, past winners New Zealand and South Africa, Oceania champions Australia, Six Nations champions Ireland and Wales were victorious on day one of the World Rugby U20 Championship in Argentina.