450 



DIGESTIVE SYSTEM OF THE OX 



The formula of the deciduous teeth is: 



2 



/ 3\ 



! ( Di-Dc-Dp- ) = 



V 4 3/ 



20 



TABLE OF AVERAGE PERIODS OF ERUPTION OF THE TEETH IN THE OX 



Teeth Eruption 



A. Temporary: 



First incisor (Di 1) 1 



Second incisor (Di 2) r>- ^i, x o i 



Third incisor (Di 3) \ ^"^^ *° ^ weeks. 



Fourth incisor (Di 4) J 



First cheek tooth (Dp 1) Birth to 3 weeks. 



Second cheek tooth (Dp 2) "1 -o- ,, , i j 



Third cheek tooth (Dp 3) / ^'^^h to few days. 



B. PermanerU: 



First incisor (II) 1,1 2 to 2 }'ears. 



Second incisor (12) 2 to 2} 2 J'ears. 



Third incisor (13) 3 years. 



Fourth incisor (14) 3J^ to 4 years. 



First cheek tooth (PI) 2 to 23^ years." 



Second cheek tooth (P2) 1 1.2 to 23^ years. 



Thinl rlicek toothi I' o 1 2 ' 2 to 3 years. 



Fourth cheek tooth ( Al 1 1 .5 to 6 months. 



Fifth cheek tooth (M 21 1 to 13^ years. 



Sixth cheek tooth (M 3j 2 to 23^ years. 



The eruption of the permanent teeth is subject to great variation. The above 

 figures are the average of observations of improved breeds under favorable condi- 

 tions. 



Fig. 3S5. — Salivary Glands of Ox. 

 a, Parotid gland; 6, mandibular gland; c, ventral, d, middle, and e, dorsal buccal glands; /, labial glands; g, 

 buccinator nerve; h, buccinator vein; 1, masseter (cut); 2, ramus of mandible; 3, zygomaticus muscle; 4, conical 

 papilla of lip; 5, buccinator muscle. (After Ellenberger, in Leisering's Atlas.) 



