Napitupulu, M.S. et al. 2026. Optimization of Indigenous Microorganism (IMO) Concentration in Chicken Feathers on the Physicochemical Properties of Feather Meal. Andalasian Livestock. 3, 1 (Jan. 2026), 72–81. DOI:https://doi.org/10.25077/alive.v3.n1.p72-81.2026.