Kadar Tanin, Berat Telur, Indeks Telur, Dan Berat Kerabang Telur Itik Yang Disamak Ektrak Etanol Kulit Manggis (Garcia Mangostana L ): Tannin Content, Egg Weight, Egg Index, and Weight of Tanned Duck Egg Centipede Mangosteen Skin Ethanol Extract (Garcia Mangostana L ). jrap 2022, 7 (2), 56-64.