DIGESTIVE APPARATUS, 49 



are called head and tail. Shape is long triangular. Much like 

 a big salivary gland. Pancreatic fluid empties into intestine at 

 or near the bile duct. This fluid contains four different fer- 

 ments : one acts on starch, one on protein, one on fats, and one 

 ■curdles milk. This is probably the most important of the di- 

 gestive fluids. 



The large intestine is about 25 feet long in horse, capacity 

 33 gallons. In cow 42 feet long, capacity 18 gallons. Parts: 

 Caecum, large colon, small colon. 



Caecum (blind pouch) in horse 3 J/2 feet long, capacity 73^ 

 .gallons. Important in digestion of cellulose. 



Large colon in horse 12 feet long, capacity 20 gallons. 



Small colon in horse 10 feet long, capacity 6 gallons. In cow 

 large and small colon are studied together, and are 35 feet long, 

 with a capacity of 14 gallons. 



Large intestine of both animals is long, large and sacculated 

 to hold contents a long time and offer a large amount of ab- 

 sorbing surface. It takes contents about five days to pass through 

 the alimentary tract of cow, and about three days to pass through 

 that of horse. 



