The probation term comes after Justin Alexander Teixeira, 25, of Placerville completed 190 days at a prison boot camp outside Las Vegas, the San Francisco Chronicle reported.
Teixeira, who pleaded guilty last year, apologized for decapitating the bird at the Flamingo Hotel's Wildlife Habitat.
He must also perform 16 hours of community service per month at a animal shelter, according to the Associated Press.
Security video showed Teixeira and two other UC Berkeley students laughing and chasing a 14-year-old helmeted guinea fowl named Turk around the hotel habitat.
Teixeira twisted the bird's neck, tossed the body one way and the head into nearby rocks, the AP reported.
The two other students, Eric Cuellar, 26, and Hazhir Kargaran, 27, pleaded guilty to misdemeanors and were fined. They were also ordered to serve community service.