Breadfruit is the fruit of an evegreen tree that belongs to the mulberry family. It comes from Southeast Asia and tends to be grown in Asia, Central and South America and the Caribbean.
It has a mealy and bland taste and it contains a lot of starch quite like undercooked potatoes.
Image (source: Wikipedia)
Let’s take a look by viewing its acidic, phosphorus, sugar, salt, calcium content
Total Fat0.2g. 0%
Saturated Fat0.0g. 0%
Vitamin A0.0IU. 0%
Vitamin C29.0mg. 48%
Vitamin D~ ~
Vitamin E (Alpha Tocopherol)0.1mg. 1%
Vitamin K0.5mcg. 1%
Read More http://nutritiondata.self.com/facts/fruits-and-fruit-juices/1857/2#ixzz2rhEqcVya
As you can see breadfruit has a hint of phosphorus, calcium, and a little acid. It is also very sweet.
However breadfruit also has a very good amount of vitamin c in it.
So guinea pigs can eat breadfruit, however only once a week in small amounts because of its sweetness. However, it would be a good addition to their diets because of the vitamin c content.
However do get rid of the skin and only feed the flesh.