At what age do a cow’s permanent 4th incisors begin to erupt in the mandible?
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The 4th incisors are actually canine teeth and they erupt at 3.5 to 4 years in cattle. Cattle age is not always given in a history and estimating age during physical exam helps narrow differentials.
References for times of eruption vary by about six months because the times of tooth eruption vary among individual animals and breeds.
Tooth
Eruption Age
Ist permanent incisor
1 to 1.5 years
2nd permanent incisor
2 to 2.5 years
3rd permanent incisor
3.5 years
4th permanent incisor
3.5 to 4 years
Full eruption of a new tooth may take another six months.
