the end products are exported. In fresh food, as well as artichokes, the production of tomatoes (including Camoni tomato) and citrus fruit are of a certain weight. Sardinia is the 5th Italian region for rice production, the main paddy fields are located in the Arborea Plain. In addition to meat, Sardinia produces a wide variety of cheese, considering that half of the sheep milk produced in Italy is produced in Sardinia, and is largely worked by the cooperatives of the shepherds and small industries. Sardinia also produces most of the pecorino romano, a non-original product of the island, much of which is traditionally addressed to the Italian overseas communities. Sardinia boasts a centuries-old tradition of horse breeding since the Aragonese domination, whose cavalry drew from equine heritage of the island to strengthen their own army or to make a gift to the other sovereigns of Europe. Today the island boasts the highest number of horse herds in Italy. There is little fishing (and no real maritime tradition), Portoscuso tunas are exported worldwide, but primarily to Japan. Industry and handicraft The once prosperous mining industry is still active though restricted to coal (Nuraxi Figus, hamlet of Gonnesa), antimony (Villasalto), gold (Furtei), bauxite (Olmedo) and lead and zinc (Iglesiente, Nurra). The granite extraction represents one of the most flourishing industries in the northern part of the island. The Gallura granite district is composed of 260 companies that work in 60 quarries, where 75% of the Italian granite is extracted. The principal industries are chemicals (Porto Torres, Cagliari, Villacidro, Ottana), petrochemicals (Porto Torres, Sarroch), metalworking (Portoscuso, Portovesme, Villacidro), cement (Cagliari), pharmaceutical (Sassari), shipbuilding (Arbatax, Olbia, Porto Torres), oil rig construction (Arbatax), rail industry (Villacidro), arms industries at Domusnovas and food (sugar refineries at Villasor and Oristano, dairy at Arborea, Macomer and Thiesi, fish factory at Olbia). In Sardinia is located the DASS (Distretto Aerospaziale della Sardegna), a consortium of companies, research centers and universities focused on aerospace industry and research. The aerospace manufacturer Vitrociset, in Villaputzu, is involved in the production of the stealth multirole fighter Lockheed Martin F-35 Lightning II. Plans related to industrial conversion are in progress in the main industrial sites, like in Porto Torres, where seven research centres are developing the transformation from traditional fossil fuel related industry to an integrated production chain from vegetable oil using oleaginous seeds to bio-plastics.matrica green chemicals Sardinia is involved in the industrial