BATON ROUGE, Louisiana (Ticker) -- Not much has changed between Louisiana State and Louisiana-Lafayette in 64 years.
Matt Mauck threw three touchdowns in the first quarter, but LaBrandon Toefield suffered a season-ending injury as the 19th-ranked Tigers remained unbeaten all-time against the Ragin' Cajuns with a 48-0 rout.
The win was costly after Toefield - the Tigers' All-SEC running back - broke his left arm in the second half. He will be sidelined for the rest of the season and surgery is being considered.
"We have to support him," Mauck said. "He works so hard, so if there is anyone who is going to come back from an injury like that it will be him. LaBrandon is a great running back. You can't replace a guy like him."
"That is just the nature of the game," LSU middle linebacker Bradie James said. "All I can do is pray that it is not as bad as it is. We need him out there on that field. Hopefully, he will be back, but as a team we need to support him and make sure he is alright mentally."
Louisiana State won the first 19 meetings with Louisiana-Lafayette (1-4), but the teams had not faced each other since 1938. Despite the extended hiatus, the Tigers had little trouble continuing the tradition of blowing out their intrastate rivals.
Louisiana State (4-1) has outscored the Ragin' Cajuns 912-19 all-time and has posted 10 consecutive shutouts in the series. Louisiana-Lafayette has not scored against the Tigers since 1924.
Mauck, who threw just four touchdowns in the Tigers' first four games, nearly matched that total in the first 11 minutes. He threw a 25-yard scoring strike to Devery Henderson 3:36 into the game and connected with Michael Clayton on a 36-yarder less than five minutes later.
Mauck tossed a four-yard TD to Clayton with 4:37 to go as Louisiana State rolled to its most lopsided victory of the season.
The sophomore quarterback completed 8-of-12 passes for 138 yards in the first quarter. He failed to complete his final nine passes, but it didn't matter.
"Things worked out well in the first quarter," Mauck said. "We got a little complacent. We need to not look at the scoreboard and keep playing hard the whole game. We ran a lot of the same things we have been doing this year. We executed better than we have been doing."
The Tigers scored 42 points in the first 30 minutes, their highest scoring first half since September 27, 1997.
Louisiana State had 359 yards of total offense and limited UL-Lafayette - which was averaging 266 offensive yards per game - to a season-low 70.
Louisiana-Lafayette quarterback Jon Val Cleave completed just 6-of-20 passes for 46 yards and an interception. He had thrown for 526 yards in his previous two games.
The Ragin' Cajuns managed just 17 rushing yards, committed a pair of turnovers and were 0-for-15 on third down.
The Tigers have held four consecutive opponents under 250 yards, the team's longest streak since 1970.
After its explosive first quarter, Louisiana State extended the lead on Domanick Davis' two-yard touchdown run just 52 seconds in the second.
Joseph Addai had a nine-yard TD run midway through the second quarter and Davis scored from three yards out with 60 seconds left for a 41-0 halftime lead.
Addai scored the only touchdown of the second half on a 34-yard run with 2:55 left in the third quarter.
Addai rushed for a career-high 98 yards on 11 carries and Davis, who tied a career high with 122 yards last week, rushed 15 times for 50 yards.