Ratings for the major broadcast networks were down 3 percent in primetime last season even when delayed viewing on DVRs was included in the measurements, according to figures released Friday by Nielsen Research. As reported by TV Week, the continued erosion of the broadcast TV audience was being attributed to the early introduction of Daylight Saving Time this year and to the increase in the number of reruns. The trade publication observed that in March, 34 percent of the hours aired on the networks were repeats compared with 19 percent last year. Nielsen indicated that competition from the Internet remains an insignificant factor in the ratings decline.