340 



DIGESTIVE SYSTEM OF THE HORSE 



The Teeth of the Horse 



The Permanent Teeth 

 The formula of the permanent teeth of the horse is: 



(3 1 3or4 3\ 

 I - C - P M - ] 

 3 13 3/ 



40 or 42 



Fig. 244. — Upper Teeth of Horse, About Four and One-half Fig. 245. — Lower Teeth of Horse, 



Years Old. Four Years of Age. 



/', /-, P, Incisors; C, canine; P', P-, P^, P^, premolars; il/i, .1/^ AP, /', I-, First and second permanent 



molars. incisors; Dfl, third deciduous incisor. The 



cheek teeth are numbered according to 

 popular usage. 



In the mare the canines usually are very small and do not erupt, reducing the num- 

 ber to 36 or 38.^ 



1 Ellen})erger found, as the result of extensive observations (8000 subjects), that about 

 2 to 3 per cent, of mares have erupted canines in l)oth jaws; that 6 to 7 per cent, have them in 

 the upper jaw; while 20 to 30 per cent, have them in the lower jaw. 



