In laying hens, Qiao et al. (2015) found that 2.0 mass% Pal supplementation,
especially the natural Pal, enhanced protease activity in jejunal
digesta and pancreatic amylase activity, and the change of pancreatic
amylase activity was parallel to the pancreatic amylase mRNA
abundance. Also, broiler chickens fed diets supplemented with a combination
of zeolite and Pal exhibited significantly higher activities of amylase,
lipase, and trypsin in jejunal digesta