Page 388 - Anatomy and Physiology of Farm Animals, 8th Edition

Anatomy of the Digestive System / 373

Table 20-1. Formulas and Eruption of Deciduous Teeth
VetBooks.ir Deciduous Teeth Horse Ox Sheep Pig

0 0 3
3 1 4
0 0 3
3 0 3
Formulas*
3 0 3 4 0 3 4 0 3 3 1 4
Eruption of Incisors
DI 1 Birth to 1 week Birth to 2 wk Birth to 1 week 2–4 week
DI 2 4–6 weeks Birth to 2 week Birth to 1 week 1.5–3 months
DI 3 6–9 months Birth to 2 week Birth to 1 week Birth or before
DI 4 Birth to 2 week Birth to 1 week
Eruption of Canines
Before birth
Eruption of Premolars
DP 1 Birth to few days usually before birth 3.5–6.5 months
DP 2 Birth to 2 weeks Birth to few days Usually before birth 7–10 week
DP 3 Birth to 2 weeks Birth to few days Usually before birth 1–3 week (upper)
1–5 week (lower)
DP 4 Birth to 2 weeks 1–4 week (upper)
2–7 week (lower)
* The deciduous formula is shown for one side of the mouth only, with upper arcade represented above and
lower arcade below. The first number is the incisors; the second, canines; and the third is premolars.

Table 20-2. Formulas and Eruption of Permanent Teeth
Permanent Teeth Horse Ox Sheep Pig
Formulas* 3 1 3–4 3 0 0 3 3 0 0 3 3 3 1 4 3
3 1 3 3 4 0 3 3 4 0 3 3 3 1 4 3
Eruption of Incisors
I 1 2.5 year 1.5–2 year 1–1.5 year 1 year
I 2 3.5 year 2–2.5 year 1.5–2 year 16–20 months
I 3 4.5 year 3 year 1.5–3 year 8–10 months
I 4 – 3.5–4 year 3.5–4 year –
Eruption of Canines
4–5 year – – 9–10 months
Eruption of Premolars
P 1 5–6 months 2–2.5 year 1.5–2 year 12–15 months
P 2 2.5 year 1.5–2.5 year 1.5–2 year 12–15 months
P 3 3 year 2.5–3 year 1.5–2 year 12–15 months
P 4 4 year 12–15 months
Eruption of Molars
M 1 9–12 months 5–6 months 3–5 months 4–6 months
M 2 2 year 1–1.5 year 9–12 months 8–12 months
M 3 3.5–4 year 2–2.5 year 1.5–2 year 18–20 months

* The permanent formula is shown for one side of the mouth only, with upper arcade represented above and
lower arcade below. The first number is the incisors; the second, canines; the third is premolars; and the
fourth is the molars.