The BORG would use thier technology and blast the Tribbles into smithereens, and as has been stated, the BORG have no food suitable to sustain the Tribbles' life functions, so the Tribbles would croak, leaving the BORG with a BIG clean up in Isle 7.

"I offer you a Vulcan prayer, Mr Suder. May your

death bring you the peace you never found in

life." - Tuvok.