limit the output

Hi, is it possible to limit the birdc show route output for a certain protocol? I wrote a script which runs in a specific interval and fetches the received BGP routes. Normally the bgp routing table has thounsands of entries. In order to save some cpu power Bird only needs to show me the first 10,15,20 or 25 routes. In SQL there is a "limit" keyword which would be able to fulfil my desire. So... is there smth similar in bird? Thanks in advance.