174 



A STUDY OF FARM ANIMALS 



Figure 50. The teeth showing 

 3i^ years of age. 



other four. Similar changes fol- 

 low in order in the other pairs. 

 The teeth of the horse at 

 three years show in the front of 

 each jaw a pair of permanent 

 incisors, larger than the nippers, 

 occupying the place of the central 

 pair, which they have pushed out. 



The teeth of the horse at four years show the addition 

 of two more permanent large incisors, one on each side of 

 the central pair in each jaw, in place of the colt teeth. 



The teeth of the horse at five 

 years show the last pair of nippers 

 in each jaw replaced by perma- 

 nent incisors. At this age there 

 appears in the mouth of the male 

 four canine teeth, commonly 

 known as "tushes." These teeth 

 have roundish points, and there 

 are two in each jaw, one being on 

 each side of the permanent in- 

 cisors, and a short distance back 

 of them. After the fifth year the 

 age of the horse is determined by the extent to which the 

 ends of the teeth and the cups previously referred to are 

 worn down, the older teeth naturally showing the most wear. 



The teeth of the horse at six 

 years show the cups of the central 

 permanent incisors in the lower 

 jaw somewhat worn. 



The teeth of the horse at 

 seven years show that the cups 

 of the second pair of permanent 

 incisors in the lower jaw are 

 Figure 52. The jeeth showing wom away to a no ticeable degree. 



Figure 51. The teeth showing 

 4 years of age. 



