1Department of Livestock Social Economics, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia.
2Department of Animal Nutrition and Feed Science, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia.
3Department of Animal Production, Faculty of Animal Science, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia.
Email: ahmadromadhoni@ugm.ac.id