Which rabbit breed is commonly known as CA?

The breed commonly known as CA is the Californian rabbit. This breed is characterized by its distinctive color pattern: a white body with darker markings on its ears, nose, feet, and tail, which resembles the coloring of a Siamese cat. The Californian is well-regarded for its meat production qualities as well as its mild temperament, making it a popular choice among both commercial breeders and hobbyists. Its name directly reflects its origin and breeding purpose in California, where it was developed for both fur and meat.

The other breeds listed, while known for their own unique characteristics, do not correlate with the abbreviation "CA." Cinnamon rabbits are known for their rich reddish-brown coloration, the Checkered Giant is a large breed distinguished by its striking coloration and markings, and the Champagne d'Argent is notable for its unique slate-grey fur and silvering effect as it matures. Thus, these breeds are not associated with the abbreviation CA, affirming that the Californian is indeed the correct answer.