Yusuf Leonard Henuk is a Professor in the Department of Animal Science, Faculty of Agriculture at University of Sumatera Utara (USU), Medan, North Sumatera, Indonesia. He received a Bachelor’s degree (S1: ‘Sarjana’) from the Faculty of Animal Science, the University of Nusa Cendana in Indonesia from 1980-1984. He obtained Master in Rural Science (M.Rur.Sc.) from the University of New England from 1991 – 1995 and continued Doctor of Philosophy (Ph.D) from the University of Queensland from 1998 – 2001. Both in Australia. Currently he is working a visiting scholar in Texas A&M university.