Teeth Temporary Permanent Temporary Permanent Temporary Permanent

Incisors: yrs. mos. yrs. mos. mos.
Centrals At birth 2 6 At birth 1 8 At birth, 12
or 3-4
weeks
First 4-6 wks. 3 6 At birth 2 9 8-12 wks. 18
laterals
Second 5-12 days 3 6
laterals
Corners 6-9 mos. 4 6 12-18 days 4 6 At birth 9
Molars:
First At birth 2 6 At birth 2 6 7 weeks 5
Second At birth 2 6 At birth 1 6 8-28 days 14
Third At birth 3 6 At birth 3 8-28 days 13
Fourth 10-12 1 6 13
Fifth 2 2 5
Sixth 4-5 2 6 9
Seventh 18
Canines or 4-5 9
tusks

IN DETERMINING THE AGE of the different domestic animals by the development
and appearance of the teeth, most of the attention is given to the lower
incisor teeth. Up to the fifth year, the age of the horse or ox can be
easily determined by the eruption and replacement of the incisors.

At _one year_ of age the colt has a fully developed set of temporary
incisors. The ruminant's incisors at this age all show wear.