The Astros have designated outfielder Travis Buck for assignment, the club announced via press release.
Buck, 28, was a reserve player and occasional starter this season, his first in the Astros' organization, although he had been on the disabled list since late May due to a heel injury. The left-handed hitter owns a .216/.284/.311 line in 81 plate appearances in 2012 and .243/.316/.399 line for his career.
Formerly a well-regarded prospect with the Athletics, Buck's best performance to date came as a rookie with Oakland in 2007, when he hit .288/.377/.474 in 334 plate appearances, though he's battled injuries and ineffectiveness since then. Buck spent 2011 in the Indians organization.
Buck was DFA'd to clear a spot on the 40-man roster for infielder Scott Moore, whose contract was purchased from Triple-A Oklahoma City.