Research Article
Immune Response of Laying Hens Exposed to 30 ppm Ammonia for 25 Weeks
College of Animal Science and Technology, Agricultural University, 071001 Hebei, China
F.F. Yan
Department of Animal Sciences, Purdue University, West Lafayette, 47907 IN, USA
J.Y. Hu
Department of Animal Sciences, Purdue University, West Lafayette, 47907 IN, USA
Yanan Wu
College of Animal Science and Technology, Nanjing Agricultural University, 210095 Jiangsu, China
C.M. Tucker
Department of Agricultural and Biological Engineering, University of Illinois, 61820 IL, USA
A.R. Green
Department of Agricultural and Biological Engineering, University of Illinois, 61820 IL, USA
H.W. Cheng
USDA-ARS, Livestock Behavior Research Unit, 125 Russell street, West Lafayette, 47907 IN, USA