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bash-3.2$ cat test4
ABC_20101.2A.2010_01
ABD_20103.2E.2010_04
ABE_20107.2R.2010_08
bash-3.2$ sed 'p;s/\..*$//g' test4 |xargs -n2 echo mv
mv ABC_20101.2A.2010_01 ABC_20101
mv...

As I noticed you seem not to process a text file with those names, I added a 2nd block below, working on directory entries ie. files. You could just convert the echo into a mv like:

$> for file in...