Days before the Sunday morning raid, San Bernardino County officials announced a crackdown on the illegal blood sport and released a video of roosters slashing at each other with steel blades attached to their legs.
The Victorville Daily Press says about 300 people were attending Sunday's cockfight in a barn arena in the Baldy Mesa area, a community between Victorville and Hesperia.
Property owner Fernando Hernandez and most of the spectators fled when deputies showed up.
Forty-seven people were arrested, mostly for being spectators. Six were arrested and booked for investigation of animal cruelty.
There were about 20 dead roosters. Deputies seized 92 live birds and about $21,000.