DETERMINING THE AGE OF CATTLE 

 BY THE TEETH. 



THE AGE OF CATTLE can be approximated closely by the 

 appearance, development, and subsequent wear of their second 

 incisor teeth. Cattle have eight incisor teeth, all in the lower jaw. 

 In the calf at birth two or more of the temporary or first incisor teeth 

 are present. With the first month the entire eight incisors have ap- 

 peared. 



Fig. 1. — Internal face of incisors of the calf. 



As the animal approaches 2 years of age the center pair of tem- 

 porary incisor teeth or pinchers are replaced by the permanent pinch- 

 ers which at 2 years attain full development. 



Fig. 2. — Internal face of incisors at 2 years. 



At from 2J to 3 years the permanent first intermediates are cut 

 and are usually fully developed at 3 years. 



Fig. 3. — Internal face of incisors at 3 years. 

 126894°— 19 (3) 



