Black-breasted red is the most common plumage color pattern. Silver and gold ducking is also known to exist. As well as black-tailed red ginger. Leg colors are green and yellow, varying even within the same flock.
Corn is an expensive commodity that is not readily available. Brown rice itself is not necessarily fed to the fowl either due to its demand as a staple of the human diet. So only the byproducts of brown rice, fruit, and vegetables are fed to the fowl. Hainan Island is a typhoon prone location. Debris from the sea often washes up on the beaches. Dead fish, crustaceans, and sea weed are commonly collected from the beaches and fed to livestock, including the Hainan fowl.
Despite this diet of rice byproducts and sea refuse, it seems the fowl do well in the US living on other grains. This is in stark contrast to other fowl such as non-molting long-tail fowl that have a similar diet in their native country of Japan and do best maintained on such a diet.
The fowl were fought sometimes ceremoniously at specific times of the year. It's said that they would not fight during the winter months and were used mostly during the spring and summer months during breeding season when the roosters were already prone to fighting.
Today the fowl are still used in this manner in rural villages in China. Elsewhere outside of China they are kept as pets and ornamental fowl.