. Cyclopedia of farm animals. Domestic animals; Animal products. HORSE HORSE 435 the tooth not in wear projects downward, forming more or less of a notch. Eight years old.—At eight years of age, the cups have disappeared from the teeth in the lower jaw. One must not be misled by the slight dark-colored inden-. Fig. 444. Lower nippers of a six-year-old horse. Fig. 445. Side view of the teeth of a six-year-old horse. tations that are still present, for they are not deep enough to be called cups. (Fig. 447.) The shape of the teeth has undergone marked changes. (Com- pare Fig. 439 with Fig. 447.)
. Cyclopedia of farm animals. Domestic animals; Animal products. HORSE HORSE 435 the tooth not in wear projects downward, forming more or less of a notch. Eight years old.—At eight years of age, the cups have disappeared from the teeth in the lower jaw. One must not be misled by the slight dark-colored inden-. Fig. 444. Lower nippers of a six-year-old horse. Fig. 445. Side view of the teeth of a six-year-old horse. tations that are still present, for they are not deep enough to be called cups. (Fig. 447.) The shape of the teeth has undergone marked changes. (Com- pare Fig. 439 with Fig. 447.) In the first place, the teeth were thin from outside to inside, and com- paratively broad from right to left, while in the latter case they are much thicker from inside to outside — they have become more triangular in shape. If viewed from the side, they will appear somewhat longer and will meet at a sharper angle than they did when the horse was younger. As age advances, the angle of the teeth decreases. At three years of age, the upper and the lower teeth meet nearly vertical with each other, while at twenty they meet at an angle of only 45°. Nine years old.—At nine years of age, the cups will have disappeared from the upper central inci- sors, and be shallow in the intermediate, and fairly deep in the corners. The cups are not likely to disappear at as regular intervals in the upper jaw as they did in the lower. Therefore, it is not always possible to tell the age of the horse within a year or two after he has passed his eighth year. Horses with soft bones may show a mouth older than they really are, while those with hard dense bones may show a mouth younger than they are. Ten years old.—At ten years of age, the cups have disappeared from the upper inter- mediates, but are still in the corners, although shallow. The teeth are more triangular in shape, and those of the upper and lower jaw meet at a sharper angle as the age increases. Eleven years old.—At eleven yea
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