Can Guinea Pigs Eat Boysenberries?

Related to the North American blackberry, the boysenberry is a juicy berry that is glossy and large in shape. Although It is often eaten eaten fresh, it us put into jams, syrups and preserves. They taste a bit like raspberries.
Source http://www.wisegeek.org/what-is-a-boysenberry.htm
Image http://upload.wikimedia.org/wikipedia/commons/3/32/Boysenberry.jpg

So can guinea pigs eat boysenberries, and if they can, how much can they eat?
Let’s take a look at their nutritional data in particular their phosphorus, sugar, acidic, fat and calcium content because that is most pertinent to piggies.
Total Fat 0.1 gt0%
Saturated fat 0 gt0%
Polyunsaturated fat 0.1 g
Monounsaturated fat 0 g
Cholesterol 0 mgt0%
Sodium 3 mgt0%
Potassium 90 mgt2%
Total Carbohydrate 22 gt7%
Dietary fiber 2.6 gt10%
Protein 1 gt2%
Vitamin At0%
Vitamin Ct10%
Calciumt1%
Iront2%
Vitamin Dt0%
Vitamin B-6t0%
Vitamin B-12t0%
Magnesiumt2%
Sugar 6.9g
As you can see boysenberries, have a hint of calcium, but are quite sweet and have a good amount of vitamin c.
As you can see boysenberries are very good for guinea pigs but because of their sweetness guinea pigs can eat them two to three times a week.
They are a very good addition to a guinea pig’s diet because of the lack of infirmities it them.
If you can find them, they are often found in farmers markets as your average grocery store won’t usually stock them.