Research Article
Effect of Direct-fed Microbials, Bacillus subtilis, on Production Performance, Serotonin Concentrations and Behavioral Parameters in a Selected Dominant Strain of White Leghorn Hens
Department of Animal Sciences, Purdue University, West Lafayette, 47907 Indiana, United States of America
Hui Chen
College of Animal Science and Technology, Agricultural University of Hebei, Baoding, 071001 Hebei, China
Heng-Wei Cheng
Livestock Behavior Research Unit, USDA-ARS, West Lafayette, 47907 Indiana, United States of America