Y. Widiawati Indonesian Research Institute for Animal Production (IRIAP),
Jl. Veteran III, PO BOX 221, Ciawi, Bogor 16002, Indonesia Indonesia
E. Teleni Veterinary Science Department, James Cook University, Townsville Australia Australia
Suharyono Suharyono Center for Isotopes and Radiation Application, National Nuclear Energy Agency,
Jl. Lebak Bulus Raya No.49, Jakarta 12440, Indonesia. Indonesia