IT wasn't clear who was more excited on Saturday, the Bove family or their chickens. The family's two older sons, Gene, 12, and Christopher, 10, had entered four birds in the 4-H poultry competition at the New Jersey State Fair here and were waiting with their parents, Gene and Michelle, for the judgment to come down. The chickens, which were scratching at the floors of their cages and cocking their heads to get a good one-eyed look at the gathering crowd, were among 50 exhibited by participants age 8 to 18, as well as 308 more in the adult category, at the 10-day fair, which is expected to attract 200,000 visitors by the time it closes on Sunday.