PENGARUH PEMBERIAN EKSTRAK DAUN KEPEL (Stelechocarpus burahol) SEBAGAI FEED ADDITIVE HERBAL TERHADAP RETENSI NITROGEN DAN AMONIA EKSKRETA AYAM BROILER (The Impact of Kepel Leaf (Stelechocarpus burahol) Extract as Feed Additive on Nitrogen Retention and Ammonia Excretion of Broiler Chickens) - Nuryana, Riki Saumi (Fakultas Peternakan, Universitas Hasanuddin, Makassar, 2021)