Citation: F. Liebert et al., STUDIES CONCERNING THE PROTEOLYTIC CONDIT ION IN THE INTESTINAL-TRACTOF CHICKENS, AS RELATED TO NITROGEN AND PHOSPHORUS UTILIZATION DEPENDENT ON TRYPSIN-INHIBITOR ACTIVITY AND PHYTASE ADDITION IN THE DIET .1.MEASUREMENT OF TRYPSIN ACTIVITY IN PANCREATIC TISSUE AND SMALL-INTESTINE CHYMUS, METHODS AND RESULTS, Journal of animal physiology and animal nutrition, 75(4-5), 1996, pp. 192-199