RESPONSE OF OFFERED FERMENTED PURPLE SWEET POTATO (Ipomoea batatas L) SKIN AS ANTIOXIDANT COMPOUND IN DIETS IMPROVED MEAT QUALITY OF BALI DUCK - Yadnya, Tjokorda Gede Belawa (Faculty of Agriculture, Udayana University in cooperation with Asia-Oceania Bioscience and Biotechnology Consortium (AOBBC), 2016)