. Judging farm animals . Livestock. Pig. 12.—Two and one-half years of age. iside of the two al- • ready present. Some time between the sixth and ninth month, two more ap- pear, one by the side of each outer tooth. These six pairs are called nippers. They are the milk teeth, and are only temporary. They are not all equally level with one another at first, but in the course of twelve months or so they become uniform on the surface. The outside of the tooth is very hard, white enamel. This covers a hard, ivory-like bone, at the center of which is a softer sub- stance which more easily wears away
. Judging farm animals . Livestock. Pig. 12.—Two and one-half years of age. iside of the two al- • ready present. Some time between the sixth and ninth month, two more ap- pear, one by the side of each outer tooth. These six pairs are called nippers. They are the milk teeth, and are only temporary. They are not all equally level with one another at first, but in the course of twelve months or so they become uniform on the surface. The outside of the tooth is very hard, white enamel. This covers a hard, ivory-like bone, at the center of which is a softer sub- stance which more easily wears away, but is constantly renewed. The ends of the teeth have a ridged cutting surface, forming at the centers small depressions, or "cups," by which the age is determined. The cups in the central pair of nippers at first are wide and somewhat dark; in the second year, with use, they appear lighter in color, and become smaller than those of the other four. Similar changes follow in order in the other pairs. At two and one-half to three years of age permanent incisors or nippers appear. These teeth are larger than the first ones, which were small but suited to the mouth of the colt. The first or central pair of temporary teeth is pushed out by the pair of larger per- manent ones. At three and one-half to four fflS- is.—Three and one-half years of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Plumb, Charles S. (Charles Sumner), 1860-1939. New York : Orange Judd Company
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Keywords: ., bookauthorplumbcharlesscharless, bookcentury1900, bookdecade1910
