domain name system - CNAME in @ (BIND)

Can I put something like this in my .zone
file?

@ IN CNAME
            srvr-01.foo.bar.

Or is
that invalid? If it's invalid, how can I redirect visitors from
mydomain.com to the server
srvr-01.foo.bar? (note that I'm not given the server IP, just
the domain, which makes me think it could change
randomly)

EDIT: Sorry, my bad. I replaced
NS with CNAME, which is what I
actually wanted to write.

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