$TTL - does this "overwrite" the SOA ttl value?

Let's say we have a zonefile that looks like this:
Code: 
$TTL 86400

foo.com.      IN      SOA   ns.joe.com. root.foo.com. (
                              2003080800 ; se = serial number
                              18000      ; ref = refresh
                              900        ; ret = update retry
                              259200     ; ex = expiry
                              10800      ; min = minimum
                              )
Which TTL value will be used for the A records? Basically, I want to set up the dns so that when we modify the ip for an A record, the change will be instantaneously propogated to all...

(ie: Moving a domain from one server to another.)

 

 

 

 

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