1. Dept. of Animal Production and Technology, Faculty of Animal Science, Bogor Agricultural Univ; Jl. Agatis Kampus IPB Darmaga; Bogor 16680 Indonesia
2. Okinawa Inst. of Science and Technology; 1919-1 Tancha, Kunigami Onna son Okinawa Japan
3. Biotechnology Research Inst; Univ. Malaysia Sabah; Jl. UMS 88400 Kota Kinabalu Sabah Malaysia