Napa cabbage is also known as nappa cabbage, sui choy, celery cabbage, chinese leaft and wong bok and is a type of Chinese cabbage that comes from near the Peking region of China. It is used widely in East Asian cuisine.
So can rabbits eat Napa cabbage at all?
Lets take a look at their nutritional data, in particular their acidic, phosphorus, calcium, sugar, fat and sodium content.
Energy 68 kJ (16 kcal)
Carbohydrates
3.2 g
Dietary fiber 1.2 g
Fat 0.2 g
Protein 1.2 g
Vitamins
Vitamin C (33%) 27 mg
Trace metals
Calcium (8%) 77 mg
Iron (2%) 0.31 mg
Magnesium (4%) 13 mg
Sodium (1%) 9 mg
source wikipedia
As you can see the only nutrient of concern is calcium which it contains quite a lot of.
So rabbits can eat napa cabbage, but only raw and don’t feed too much of it as it should supplement their hay diet. A few times a week at the most should suffice, however don’t give them too much as it is known to cause them gas if too much is eaten.