An anonymous tip led authorities to the two juveniles, who admitted to shooting the cows over a two-week period, according to DWR Conservation Officer Paul Davis.
"The two teens were frustrated that they hadn't harvested any deer during the archery deer hunt and shot several cows during the first weekend of the archery deer hunt in the Clyde Creek area near Strawberry Reservoir," Davis said in a statement.
The juveniles admitted to authorities that they shot more cows about a week later. They later confessed to shooting at least nine total cows with arrows.
No cows have died from being shot because the arrows were topped with practice points, instead of the more lethal broadhead, or razor, arrow points designed for hunting big game, DWR said.
Authorities learned of the first shooting Aug. 18, which was the opening day of the archery deer hunt. Five more cows impaled with arrows were discovered the following weekend.
The incidents outraged archery hunters, livestock owners and the community in general, DWR said.
The Utah Bowman's Association, Bowhunters of Utah, Hoyt and Easton contributed reward money totaling $6,000 for information leading to the arrest and conviction of the assailants. The investigation is ongoing.