PHYSIOLOGY OF DIGESTION 4I 



Stomach of the Ox and Sheep. — The stomachs of the horse and 

 pig are simple and have one compartment wliile those of the 

 ox and sheep are more comphcated and have four compartments 

 namely, the first compartment (rumen or paunch) ; the second 

 compartment (honeycomb or reticulum) ; the third compartment 



Figf. I. — Stomach of th« horse. 

 A— cardiac end of the oesophagus; B— pyloric end and ring— afler Fleming. 



(omasum or manyplies) ; and the fourth compartment (abom- 

 asum or rennet, or true digestive compartment). This last com- 

 partment corresponds to the stomach of the horse and pig. 



Rumination. — In the ruminating animal, such as the ox, sheep 

 and goat, which "chew the cud," the food, in a somewhat imn 

 perfectly masticated condition, passes into the large first com- 

 partment of the stomach, and then into the second. Theii by a 

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