Table 5.

pH, transit time, and enzymes associated with the various portions of the broiler GI tract [88,89]

GI Segment	Transit time, min	pH	Enzymes
Mouth	-	7-7.5	Amylase
Crop	50	5.5	None - mucous secretion
Proventriculous and Gizzard	90	2.5-3.5	Pepsin, lipase
Duodenum	5-8	5-6	Amylase, trypsin, collagenase, bile, lipase
Jejunum	20-30	6.5-7	Maltase, lactase, peptidases
Ileum	50-70	7-7.5	-