Texas quarterback David Ash passed for 221 yards and two touchdowns and the Longhorn defense limited New Mexico to 50 total yards in the second half in a 45-0 victory before 100,990 fans Saturday night at Royal-Memorial Stadium. After a sluggish start, Texas regrouped in the second half behind its stable of running backs and a stingy defense. Joe Bergeron and D.J. Monroe scored rushing touchdowns as Texas improved to 2-0. This marked the first shutout for Texas since a 43-0 victory over Kansas last season. The Lobos (1-1) played most of the game without quarterback B.R. Holbrook, who left the game in the second quarter with an apparent head injury. Texas gained 290 of its 431 offensive yards in the second half. Holbrook had combined for 71 total yards -- 39 rushing, 32 passing -- before taking a hard hit from defensive back Quandre Diggs late in the second quarter. Without Holbrook, UNM relied on freshman quarterback Cole Gautsche, who was unable to sustain the offense in the second half. Bergeron led a balanced running attack with 49 yards for Texas. NOTES: Backup quarterback Case McCoy took Ash's place in the fourth quarter and threw a touchdown pass to tight end M.J. McFarland with 3:02 to go. ... Hall of Fame running back and former Texas Heisman Trophy winner Earl Campbell was the team's honorary captain and represented the Longhorns at the pre-game coin toss. ... Although Texas had a 17-0 lead at halftime, New Mexico had possession of the football for 20 of 30 minutes in the half. ... Lobos coach Bob Davie entered the game with a 10-1 record against Texas. Eight of those victories when he was an assistant coach at Texas A&M, one when he was interim head coach at Notre Dame, and one when he was defensive coordinator with the Fighting Irish.