PERSENTASE KARKAS DAN NON KARKAS SERTA LEMAK ABDOMINAL AYAM BROILER YANG DIBERI ACIDIFIER ASAM SITRAT DALAM PAKAN DOUBLE STEP DOWN (Percentage of Carcass and Non-Carcass and Abdominal Fat of Broiler Chickens were Given Acidifier Citric Acid in Feed Doubl - Sibarani, Jesica (Animal Agriculture Journal, 2016)