. Elementary lectures on veterinary science, for agricultural students, farmers, and stockkeepers ... 1. Upper Molar from Six-Year-Old Horse ^ 2. Upper Molar from Twenty-Six-Year-Old Horse / ^^^^ ^-^7) 3. Tumours on Crown of Fourth Upper Molar {par. j^o). 4. Malformed Fourth Upper Molar. DENTITION AND DENTAL DISEASES 249 364. Incisors.—Between one year and nine months and two years andthree months the two central incisors are replaced by permanentteeth ; at two years and three months to two years and six months thetwo middle lateral incisors are cast, and the animal has four broadteeth; at thr
. Elementary lectures on veterinary science, for agricultural students, farmers, and stockkeepers ... 1. Upper Molar from Six-Year-Old Horse ^ 2. Upper Molar from Twenty-Six-Year-Old Horse / ^^^^ ^-^7) 3. Tumours on Crown of Fourth Upper Molar {par. j^o). 4. Malformed Fourth Upper Molar. DENTITION AND DENTAL DISEASES 249 364. Incisors.—Between one year and nine months and two years andthree months the two central incisors are replaced by permanentteeth ; at two years and three months to two years and six months thetwo middle lateral incisors are cast, and the animal has four broadteeth; at three years old six permanent teeth are seen ; and at aboutthree years and three months the corner or canine milk teeth are shed,and eight broad teeth are in view. The permanent teeth are verymuch larger and darker than the milk teeth, which are very white,and are thus readily distinguished. 365. The following illustration shows at what age the incisormilk teeth of cattle are cast and replaced by permanents :. Fig. 13.—Permanent Incisors of the Cow. 1. Centrals, i year 9 months to 2 years 3 months. 2. Middle laterals, 2 years 3 months to 2 years 6 months. 3, Laterals, 2 years 6 months to 3 years. 4, Corners, or canines, 3 years to 3 years 3 months. —4 366. The crowns or wearing surfaces of the molar teeth ofcattle are very unlike those of the horse, having sharp elevationsand depressions, resembling the teeth of flesh-eating animals, andare well suited for tearing down rough fibrous grass, but are notadapted for grinding oats or other grain, the cow being a trueherbivorous animal. 250 VETERINARY LECTURES 367. Teething in cattle on many occasions causes a great deal of constitutional disturbance, more particularly at from one year and nine months to two years and six months old, through the temporary premolars not being cast off, when teething fever, and in many cases fatal diarrhcea, is set up. Young animals, when suffering from the retention of the crowns or shells, have tu
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