NS record round-robin

Hi!

How does a resolver do round-robin on NS records.

Scenario:
I have a DNS server authoritive for e.g. .mycompany.com
This server has a e.g. two NS entries for hr.mycompany.com

When a resolver makes are query for www.hr.mycompany.com
the server will return two NS entries for the above domain.

Question:
When the resolver receives the responses (two NS entries),
will the resolver do load balancing?!?

Buttom line:
I would like to have a round-robin like service for the NS records,
causing the NS servers for hr.mycompany.com to be more of less
equally loaded.

Regards,

Anders M. Jørgensen