REDMOND (AP) - Animal welfare investigators seized 30 roosters and seven hens suspected of being used for cockfighting, authorities said.

The birds were found in a Redmond home, where investigators also discovered steroids, syringes for injecting steroids and razor blades, which are typically attached to the legs of a rooster during fights, said Josh Capehart, an animal welfare officer who works as a special agent for the governor's office.

The investigative team also found an outdoor cockfighting ring made of hay bales, Capehart said.

Investigators learned of the suspected cockfighting through an anonymous tip. No arrests have been made in connection with the cockfights and the address of the home has not been made public.

A cockfight is a match between two birds, usually roosters, conducted in an enclosed space. Cockfighting is considered a sport in some countries, and it's common to wager on the battles.

“It's a pretty brutal sport,” said Jamie Kanski, director of the Redmond humane society, where the birds are being held.

Deschutes County deputies arrested one person at the home who had an outstanding warrant. Capehart said that person claims to have no involvement in cockfighting.

Animal abuse, possession of paraphernalia used for cockfighting and keeping animals for cockfighting can be prosecuted as felonies under Oregon law, Capehart said.

Only one of the seized birds showed signs of extensive scarring, which has led investigators to believe most of the birds were just learning to fight, possibly in a larger Central Oregon cockfighting circle.

“I believe that there's possibly other situations like this in the Central Oregon area,” Capehart said.

At the humane society, the roosters were separated by an empty cage, with a piece of cardboard blocking their vision. Otherwise they would attempt to fight, Kanski said.

The humane society will attempt to find homes for the hens. The roosters will be euthanized because they are too prone to violent behavior, Kanski said.