Broad beans are rigid and erect plants that measure 0.5–1.8 m tall, with stout stems of a square cross-section. They have broad and leathery pods that are green with a densely downy surface that measure between 5-10cm long and are 1cm in diameter and each pod contains between 3-8 seeds.
They are thought to have come from the eastern Mediterranean but are now grown all around the world and are renown for there ease of cultivation.
So can rabbits eat broad beans at all?
Lets take a look here at their nutritional data and find out more about them.
In particular their calcium, acidic, sugar, sodium, phosphorus, and fat content are of particular interest to rabbits.
Energy 1,425 kJ (341 kcal)
Carbohydrates
58.29 g
Dietary fiber 25 g
Fat 1.53 g
Protein 26.12 g
Vitamins
Thiamine (B1) (48%) 0.555 mg
Riboflavin (B2) (28%) 0.333 mg
Niacin (B3) (19%) 2.832 mg
Vitamin B6 (28%) 0.366 mg
Folate (B9) (106%) 423 μg
Vitamin C (2%) 1.4 mg
Vitamin K (9%) 9 μg
Trace metals
Calcium (10%) 103 mg
Iron (52%) 6.7 mg
Magnesium (54%) 192 mg
Manganese (77%) 1.626 mg
Phosphorus (60%) 421 mg
Potassium (23%) 1062 mg
Sodium (1%) 13 mg
Zinc (33%) 3.14 mg
source wikipedia
As you can see Broad beans contain an extreme amount of phosphorus, a lot of calcium, are very acidic, and contain a lot of fibre.
This makes them particularly bad for rabbits to eat and should be avoided as to eat them would hurt a rabbit.