A big rig carrying scores of cattle has turned over on Interstate 10 in inland Southern California, killing at least 40 cows and forcing the closure of lanes for several hours.

California Highway Patrol officials say the tractor-trailer flipped over at about 2:30 p.m. Thursday in Redlands.

Officer Hope Maxson says the truck was carrying about 160 young cows. None were on the roadway, but many were injured.

She says crews cut off the top of the trailer to pull out the remaining live animals, which were mooing loudly.

San Bernardino County Animal Control Chief Brian Cronin says veterinarians are examining the animals and removing the dead.

Maxson says the driver swerved, overcorrected and tipped the trailer over onto a pickup truck, narrowly missing the driver.

No humans were hurt.