THE DIGESTIVE TRACT 



57 



The Digestive Tract.— Teeth.— Sheep grow two sets of teeth ; 

 the first or temporary teeth number 20, and the second or perma- 

 nent teeth number 32; of the permanent teeth, 8 are incisors, 13 



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Fia. 28. — Abdominal viscera of sheep; superficial ventral view. ("Anatomy of Domestic 

 Animals," Sisson, W, B. Saunders Co.) 



premolars and 12 molars. There are no teeth in the front part of the 

 upper jaw in either lambs or sheep, but instead a cartilaginous pad, 

 on which the incisor teeth of the lower jaw impinge. As a rule, the 



