UPDATE: About 15 cattle were euthanased and the Warrego Hwy was cut after a trailer on a fully-laden road train rolled near Chinchilla.
Emergency services were called to the scene, about 10km east of Chinchilla, about 6.45am yesterday.
Chinchilla police officer-in-charge Sergeant Gerard Brady said it appeared the second trailer of the road train had rolled after the driver left the highway to avoid colliding with a wide load which was travelling in the opposite direction.
The trailer rolled into a power pole and brought down lines, which had to be repaired before emergency services could start retrieving the stricken cattle.
Some cattle escaped unhurt and were mustered into temporary yards.
"One of the escaped cattle was electrocuted," Sgt Brady said.
Traffic was halted on the Warrego for about 1.5 hours and then the highway was reopened to one lane while the trailer was cleared.
The truck driver sustained minor injuries.
Cattle loose on highway after truck rollover
EARLIER: Emergency Services crews are at the scene of a truck roll-over near Chinchilla this morning.
A Queensland Fire and Rescue Service spokeswoman said the trailer of a B-Double carrying cattle had rolled off the Warrego Highway about 6.40am some five to 10km east of Chinchilla.
The driver of the B-Double sustained minor injuries but cattle were running loose and would have to be rounded up, she said.
It is believed the trailer struck a power pole and Ergon Energy workers were en route to the scene.