If I remember correctly it is toxic like tomatoes are toxic, they are in the same family I believe, The plant (leaves and such) are toxic, but the fruit (tomatoes are berries actually) are not. If I am mistaken please correct me.
Eggplant is a plant of the family Solanaceae and genus Solanum, according to my point of view, I think that eggplant is wonderful in salads, soups, main courses, casseroles and side dishes. It is a cold-sensitive vegetable that requires a long warm season for best yields.
Not something I buy to feed specifically, but I don't like to waste things... I was beer battering and frying some last week, and I fed the left overs to the Hingebacks and they ate it right up.