Make bind query a specific server for a specified zone

Hi,

I have an interesting problem to overcome.  We utilize the MAPS Plus
rbl zone which we do a zone transfer for.  The problem is, the zone is
140+ megs which makes bind take a LLOOONNGG time to load every time it
does a xfer.  So i was tasked with putting a seperate machine up
running bind with JUST that zone.

Is there anyway i can tell our authoritative server to query that new
server for those specific requests?

TIA,

-J