[CentOS] Why yum-cron is only at x86_64 system?

Hello, all.
 
 
I have operated centos 4.x and 5.x system.
 
    for 4.x system, I auto update using yum
and for 5.x system, using yum-cron.
 
but I can't find any yum-cron package (i386) like below.
 
# yum search yum-cron(at i686, centox 5.3)

Warning: No matches found for: yum-cron
No Matches found

# yum search yum-cron(at x86_64, centos 5.3)
==================================================== Matched: yum-cron =====================================================
yum-cron.noarch : Files needed to run yum updates as a cron job

 
I don't know why the result was different?
 
 
Thanks in advance.
 
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