This study focused on the effects of soybean bioactive peptides (SBP) on productive performance, yolk cholesterol and yolk color in laying hens. Further more, the mechanism of this effects was investigated on aspects of metabolisms of bile acids and cholesterol. Experiment 1: Study on the emulsifying properties of SBPIn contrast with soy protein isolate, the emulsification of soybean peptides was increased greatly. The tope emulsifying capacity was observed when hydrolysis degree(DH) v...