Kwang Hwa Jeong Animal Environment Division, National Institute of Animal Science, R.D.A., Suwon 441-706 Korea, Republic of
Modabber Khan Animal Environment Division, National Institute of Animal Science, R.D.A., Suwon 441-706 Korea, Republic of
Ho Kang Department of Environmental Engineering, Chungnam National University, Daejeon 305-764 Korea, Republic of
Jung Kon Kim Animal Environment Division, National Institute of Animal Science, R.D.A., Suwon 441-706 Korea, Republic of
Jong Hoon Kwag Animal Environment Division, National Institute of Animal Science, R.D.A., Suwon 441-706 Korea, Republic of