Processing unwanted fruit into sour beer and other possible uses.

 A radio (ABC-Country Hour) story had unwanted (by supermarkets) fruit converted to pulp and used in the making of sour beers.  I wondered if the residue (seeds and/or skins could be used as stock/chicken feed and/or compost.  The seeds themselves, after drying, might be added to the dried pumpkin seed market.  If not, could they be processed for chemical or medical uses, thereby leaving no residual waste?