'Borrowers,' 'Brother' dip in ratings

Original reality shows took a hit Wednesday night as CBS' "Big Brother" and NBC's "The Baby Borrowers" and "Celebrity Circus" stumbled in the Nielsens.

The time-period premiere of "Brother" (5.9 million viewers, 1.8 preliminary adults 18 to 49 rating and a 6 share) matched its series-low. While "Borrowers" (6 million, 2.4/7) and the season finale of "Circus" (4.5 million, 1.6/5) had their lowest-ever performances.

That left Fox's "So You Think You Can Dance" (4.9 million, 3.0/10), down only slightly from last week, to win the night as usual.

One possible factor in the reality show rating slump: The cable premieres of Bravo's "Project Runway" and A&E's "Dog the Bounty Hunter."

Fox was out in front overall, with CBS placing second with "Brother" and repeats. NBC was tight for third with reality and repeats. ABC was fourth with repeats and "Primetime" (6.4 million, 1.9/6).