Cattle have no incisor teeth on the upper jaw. They have eight incisors on the lower jaw. According to Mayo, the temporary incisors are as follows: “The central incisors or nippers are up at birth, the internal lateral at one week old, the external lateral at two weeks, and the corner incisors at three weeks old. They are replaced by permanent incisors approximately as follows, though they vary much more than in the colt: The central incisors are replaced at 12 to 18 months; the internal laterals at about two and a half years; the external laterals at three to three and a half years; and the corner incisors at about three and a half years. In the horned cattle, a ring makes its appearance at three years of age, and a new ring is added annually thereafter.”
TEETH OF SHEEP
Sheep, like cattle, have no incisor teeth on the upper jaw. Like cattle, they have eight incisors on the lower jaw when the mouth has reached full age. The change of the teeth occurs as follows: At birth the lamb has two incisors, followed by two more very soon. At the end of two weeks two more are out, making six incisors in all. At three weeks of age two more have appeared, completing the appearance of the temporary or milk teeth.
The permanent begin to replace the temporary teeth between one and one and a half years. The two central milk teeth are first replaced by two longer and stronger teeth. The lamb is now known as a yearling.
At two years the two teeth adjoining the central incisors are replaced by permanent ones; at three the two adjoining these are replaced, making now six permanent incisors.
Between four and four and a half the last two permanent incisors appear and the sheep then has a full mouth.
CHAPTER IV
Examining Animals for Soundness and Health
In purchasing farm stock, it is a good plan to deal with reputable people only. Leave the horse trader alone. He knows too many tricks, and if you are a stranger to him you can be pretty certain that he will try one on you—just for fun.
Fortunately farmers sell to strangers more frequently than they buy of them, and when they seek new stock they deal largely with breeders, who, like themselves, are farmers and not given to the tricks of low and disreputable methods; nevertheless, every purchaser of stock should be familiar with animal form and able to recognize defects and faults when he sees them. This is as much his business as to breed, raise or feed the stock on his farm.