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VETERINARY COLLEGE
SHIVAMOGGA,VINOBANAGAR
DEPARTMENT OF VETERINARY
ANATOMY AND HISTOLOGY
STUDY OF VARIOUS INDICES FOR ESTIMATING
AGE AND SEX OF DIFFERENT ANIMALS
SUBMITTED TO:
Dr. Lakshmishree K.T
Associate proff and HOD
Dept of VAN
Veterinary College Shivamogga
SUBMITTED BY:
Dr. Umesh K .H
PG Scholar
MVSK 2009
Dept of VAN ,VCS
05-04-2022 Dr.Umesh K H 1
• Dentition is generally
used as an indicator of
age when actual
birthdates are not
available. Eruption times
and wear of the teeth
are the major factors
used to estimate bovine
age.
WHY TO
STUDY THE
DENTITION?
05-04-2022 Dr.Umesh K H 2
• Dentition pertains to the
development of teeth and
their arrangement in the
mouth. In particular, it is the
characteristic arrangement,
kind, and number of teeth in
a given species at a given age.
That is, the number, type, and
morpho-physiology of the
teeth of an animal .
WHAT IS THE
MEANING OF
DENTION?
05-04-2022 Dr.Umesh K H 3
• Estimation of age
represents one of the most
important aspects of
analysis in forensic
anthropology.
• Carbon 14 dating is used to
estimate the age of an
archeological specimen.
• To assess age at death from
tooth eruption patterns in
animal skeletons
IMPORTANCE OF
AGE
IDENTIFICATION
IN DIFFERET
ANIMALS
05-04-2022 Dr.Umesh K H 4
05-04-2022 Dr.Umesh K H 5
 Animals whose teeth are all of the same type, such as most non-
mammalian vertebrates, are said to have homodont dentition,
whereas those whose teeth differ morphologically are said to
have heterodont dentition.
 The dentition of animals with two successions of teeth
(deciduous, permanent) is referred to as diphyodont.
 While the dentition of animals with only one set of teeth
throughout life is monophyodont.
 The dentition of animals in which the teeth are continuously
discarded and replaced throughout life is termed polyphyodont.
 The dentition of animals in which the teeth are set in sockets in
the jawbones is termed thecodont
05-04-2022 Dr.Umesh K H 6
05-04-2022 Dr.Umesh K H 7
• This is not a good guide
and may give only a very
rough idea. The first horn
ring appears at 10-12
months. One ring is added
approximately in a year.
But at the fifth year, the
first three rings may not be
visible and after 8 years,
none may be visible.
DETERMINING
AGE BY HORN
RINGS
05-04-2022 Dr.Umesh K H 8
Dental formula
 The number of teeth of each type is written as a dental formula
for one side of the mouth, or quadrant, with the upper and
lower teeth shown on separate rows.
 The number of teeth in a mouth is twice that listed as there are
two sides. In each set, incisors (I) are indicated first, canines (C)
second, premolars (P) third, and finally molars (M), giving
I:C:P:M.
 So for example, the formula 2.1.2.3 for upper teeth indicates 2
incisors, 1 canine, 2 premolars, and 3 molars on one side of the
upper mouth.
 The deciduous dental formula is notated in lowercase lettering
preceded by the letter d: for example: di:dc:dp.
05-04-2022 Dr.Umesh K H 9
Dentition use in archaeology
Dentition, or the study of teeth, is an important area of study for
archaeologists, especially those specializing in the study of older
remains.
Dentition affords many advantages over studying the rest of the
skeleton itself (osteometry).
The structure and arrangement of teeth is constant and, although it is
inherited, does not undergo extensive change during environmental
change, dietary specializations, or alterations in use patterns.
The rest of the skeleton is much more likely to exhibit change because of
adaptation.
Teeth also preserve better than bone, and so the sample of teeth
available to archaeologists is much more extensive and therefore more
representative.
05-04-2022 Dr.Umesh K H 10
THIS IS HOW WE HAVE TO EXAMINE THE DENTITION
05-04-2022 Dr.Umesh K H 11
ERUPTION OF TEETH IN CATTLE
Under two years old (No permanent teeth)
Two years three months (2 permanent teeth)
Three years old (4 permanent teeth)
Three years six months (6 permanent teeth)
Four years (8 permanent teeth)
Old animal, over four years old
05-04-2022 Dr.Umesh K H 12
05-04-2022 Dr.Umesh K H 13
ERUPTION OF TEETH IN GOATS AND SHEEP
Animal under one year old (no permanent teeth)
One year old (2 permanent teeth)
Two years old (4 permanent teeth)
Three years old (6 permanent teeth)
Four years old (8 permanent teeth)
Old animal, more than four years old
05-04-2022 Dr.Umesh K H 14
05-04-2022 Dr.Umesh K H 15
05-04-2022 Dr.Umesh K H 16
05-04-2022 Dr.Umesh K H 17
05-04-2022 Dr.Umesh K H 18
05-04-2022 Dr.Umesh K H 19
The age of the horse is determined by the appearance of Incisor teeth.
The use of the examination of teeth to determine age is of value in
non-pedigree animals. Further it is important for the following
reasons.
To issue soundness certificates
For valuation of livestock
For selection and purchase
The surface which bites the food or its fellow on the opposite jaw is
the TABLE OR WEARING SURFACE of the tooth.
The mark of infundibulum is the blackened depression seen on the
table. It is lined by distinct narrow pearly white ring of enamel.
DENTITION IN HORSE
05-04-2022 Dr.Umesh K H 20
05-04-2022 Dr.Umesh K H 21
Alveolus: The bony cavity in which the fang of the tooth is embedded.
Buccal Surface: The outer surface of tooth that is next to the cheek.
Central Incisors: The 2 incisors immediately on each side of middle line
Cheek Teeth: Premolars and molars are often spoken off collectively as cheek teeth
Infundibulum: Dark depression on the table in the incisor it is called as mark.
Inwear: Hole of the table of tooth is in contact with opposite teeth of other jaw.
Mandibular cheek teeth: Lower premolars and molars.
Neck: Joins the crown to the fang.
Pulp Cavity: A hollow part of tooth containing nerves and blood vessels.
Shelly: The newly cut incisor teeth either temporary or permanent
TERMINOLOGIES
05-04-2022 Dr.Umesh K H 22
Galvayne's Groove:
The part of the groove running down the labial surface of the ground of the upper corner
incisors of the horse.
It normally appears near the gum at 10 years, is half way down at 15 years, extends down
the whole length of tooth at 20 years, has grown half way out at 25 years, and has
disappeared at 30 the age of years.
Simultaneously appearance of star and disappearance of mark takes place.
Tush: The canine tooth of the horse present in stallion or gelding but absent or
rudimentary in mark It is situated near the incisors in the lower jaw than in the upper
jaw.
Full Mouth: All permanent teeth (both molars and incisors) have fully erupted. Full
mouth is seen in the case of horses at 41 /2 to 5 years. A horse is said to be aged,
when it is over 15 years
05-04-2022 Dr.Umesh K H 23
05-04-2022 Dr.Umesh K H 24
05-04-2022 Dr.Umesh K H 25
Bishoping
It is attempting to make an old mouth to look younger. The teeth are rasped and
levelled. A false mark is gouged out of the centre of the table and blackened with
caustic (usually with silver nitrate crystals). This can be found out by carefull
observation.
05-04-2022 Dr.Umesh K H 26
Types of dental and oral diseases
 Cavities. Cavities are also called caries or tooth decay. ...
 Gum disease (gingivitis) Gum disease, also called gingivitis, is inflammation of the
gums.
 Periodontitis. ...
 Cracked or broken teeth. ...
 Sensitive teeth. ...
 Oral cancer. ...
 The link between oral and general health.
• Most animals species
(including humans) exhibit
size differences between
the sexes. Males tend to be
much larger than females.
Archaeologists measure
bones to identify the sex of
an individual. ... The
greatest length (GL) of the
bone and the the breadth
of the distal (Bd) are
measured.
How to
determine
the sex of
animal ?
05-04-2022 Dr.Umesh K H 27
05-04-2022 Dr.Umesh K H 28
• male mammals typically
have an X and a Y
chromosome (XY), while
female mammals typically
have two X chromosomes
(XX). Chromosomal sex is
determined at the time of
fertilization; a chromosome
from the sperm cell, either
X or Y, fuses with the X
chromosome in the egg
cell.
How do u
determine
sex of an
adult?
05-04-2022 Dr.Umesh K H 29
• Ischial arch is wider in
females so that outlet is
larger.Conjugate diameter
and transverse diameter
are larger in
female.Obturator foramen
is also larger in females.
• Adult male horse have
large prominent canine
teeth situated in
interdental space which are
absent in females.
How to
estimate
the sex of
animal ?
05-04-2022 Dr.Umesh K H 30
05-04-2022 Dr.Umesh K H 31

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Dentition and sex differentiaon

  • 1. VETERINARY COLLEGE SHIVAMOGGA,VINOBANAGAR DEPARTMENT OF VETERINARY ANATOMY AND HISTOLOGY STUDY OF VARIOUS INDICES FOR ESTIMATING AGE AND SEX OF DIFFERENT ANIMALS SUBMITTED TO: Dr. Lakshmishree K.T Associate proff and HOD Dept of VAN Veterinary College Shivamogga SUBMITTED BY: Dr. Umesh K .H PG Scholar MVSK 2009 Dept of VAN ,VCS 05-04-2022 Dr.Umesh K H 1
  • 2. • Dentition is generally used as an indicator of age when actual birthdates are not available. Eruption times and wear of the teeth are the major factors used to estimate bovine age. WHY TO STUDY THE DENTITION? 05-04-2022 Dr.Umesh K H 2
  • 3. • Dentition pertains to the development of teeth and their arrangement in the mouth. In particular, it is the characteristic arrangement, kind, and number of teeth in a given species at a given age. That is, the number, type, and morpho-physiology of the teeth of an animal . WHAT IS THE MEANING OF DENTION? 05-04-2022 Dr.Umesh K H 3
  • 4. • Estimation of age represents one of the most important aspects of analysis in forensic anthropology. • Carbon 14 dating is used to estimate the age of an archeological specimen. • To assess age at death from tooth eruption patterns in animal skeletons IMPORTANCE OF AGE IDENTIFICATION IN DIFFERET ANIMALS 05-04-2022 Dr.Umesh K H 4
  • 6.  Animals whose teeth are all of the same type, such as most non- mammalian vertebrates, are said to have homodont dentition, whereas those whose teeth differ morphologically are said to have heterodont dentition.  The dentition of animals with two successions of teeth (deciduous, permanent) is referred to as diphyodont.  While the dentition of animals with only one set of teeth throughout life is monophyodont.  The dentition of animals in which the teeth are continuously discarded and replaced throughout life is termed polyphyodont.  The dentition of animals in which the teeth are set in sockets in the jawbones is termed thecodont 05-04-2022 Dr.Umesh K H 6
  • 8. • This is not a good guide and may give only a very rough idea. The first horn ring appears at 10-12 months. One ring is added approximately in a year. But at the fifth year, the first three rings may not be visible and after 8 years, none may be visible. DETERMINING AGE BY HORN RINGS 05-04-2022 Dr.Umesh K H 8
  • 9. Dental formula  The number of teeth of each type is written as a dental formula for one side of the mouth, or quadrant, with the upper and lower teeth shown on separate rows.  The number of teeth in a mouth is twice that listed as there are two sides. In each set, incisors (I) are indicated first, canines (C) second, premolars (P) third, and finally molars (M), giving I:C:P:M.  So for example, the formula 2.1.2.3 for upper teeth indicates 2 incisors, 1 canine, 2 premolars, and 3 molars on one side of the upper mouth.  The deciduous dental formula is notated in lowercase lettering preceded by the letter d: for example: di:dc:dp. 05-04-2022 Dr.Umesh K H 9
  • 10. Dentition use in archaeology Dentition, or the study of teeth, is an important area of study for archaeologists, especially those specializing in the study of older remains. Dentition affords many advantages over studying the rest of the skeleton itself (osteometry). The structure and arrangement of teeth is constant and, although it is inherited, does not undergo extensive change during environmental change, dietary specializations, or alterations in use patterns. The rest of the skeleton is much more likely to exhibit change because of adaptation. Teeth also preserve better than bone, and so the sample of teeth available to archaeologists is much more extensive and therefore more representative. 05-04-2022 Dr.Umesh K H 10
  • 11. THIS IS HOW WE HAVE TO EXAMINE THE DENTITION 05-04-2022 Dr.Umesh K H 11
  • 12. ERUPTION OF TEETH IN CATTLE Under two years old (No permanent teeth) Two years three months (2 permanent teeth) Three years old (4 permanent teeth) Three years six months (6 permanent teeth) Four years (8 permanent teeth) Old animal, over four years old 05-04-2022 Dr.Umesh K H 12
  • 14. ERUPTION OF TEETH IN GOATS AND SHEEP Animal under one year old (no permanent teeth) One year old (2 permanent teeth) Two years old (4 permanent teeth) Three years old (6 permanent teeth) Four years old (8 permanent teeth) Old animal, more than four years old 05-04-2022 Dr.Umesh K H 14
  • 20. The age of the horse is determined by the appearance of Incisor teeth. The use of the examination of teeth to determine age is of value in non-pedigree animals. Further it is important for the following reasons. To issue soundness certificates For valuation of livestock For selection and purchase The surface which bites the food or its fellow on the opposite jaw is the TABLE OR WEARING SURFACE of the tooth. The mark of infundibulum is the blackened depression seen on the table. It is lined by distinct narrow pearly white ring of enamel. DENTITION IN HORSE 05-04-2022 Dr.Umesh K H 20
  • 22. Alveolus: The bony cavity in which the fang of the tooth is embedded. Buccal Surface: The outer surface of tooth that is next to the cheek. Central Incisors: The 2 incisors immediately on each side of middle line Cheek Teeth: Premolars and molars are often spoken off collectively as cheek teeth Infundibulum: Dark depression on the table in the incisor it is called as mark. Inwear: Hole of the table of tooth is in contact with opposite teeth of other jaw. Mandibular cheek teeth: Lower premolars and molars. Neck: Joins the crown to the fang. Pulp Cavity: A hollow part of tooth containing nerves and blood vessels. Shelly: The newly cut incisor teeth either temporary or permanent TERMINOLOGIES 05-04-2022 Dr.Umesh K H 22
  • 23. Galvayne's Groove: The part of the groove running down the labial surface of the ground of the upper corner incisors of the horse. It normally appears near the gum at 10 years, is half way down at 15 years, extends down the whole length of tooth at 20 years, has grown half way out at 25 years, and has disappeared at 30 the age of years. Simultaneously appearance of star and disappearance of mark takes place. Tush: The canine tooth of the horse present in stallion or gelding but absent or rudimentary in mark It is situated near the incisors in the lower jaw than in the upper jaw. Full Mouth: All permanent teeth (both molars and incisors) have fully erupted. Full mouth is seen in the case of horses at 41 /2 to 5 years. A horse is said to be aged, when it is over 15 years 05-04-2022 Dr.Umesh K H 23
  • 26. Bishoping It is attempting to make an old mouth to look younger. The teeth are rasped and levelled. A false mark is gouged out of the centre of the table and blackened with caustic (usually with silver nitrate crystals). This can be found out by carefull observation. 05-04-2022 Dr.Umesh K H 26 Types of dental and oral diseases  Cavities. Cavities are also called caries or tooth decay. ...  Gum disease (gingivitis) Gum disease, also called gingivitis, is inflammation of the gums.  Periodontitis. ...  Cracked or broken teeth. ...  Sensitive teeth. ...  Oral cancer. ...  The link between oral and general health.
  • 27. • Most animals species (including humans) exhibit size differences between the sexes. Males tend to be much larger than females. Archaeologists measure bones to identify the sex of an individual. ... The greatest length (GL) of the bone and the the breadth of the distal (Bd) are measured. How to determine the sex of animal ? 05-04-2022 Dr.Umesh K H 27
  • 29. • male mammals typically have an X and a Y chromosome (XY), while female mammals typically have two X chromosomes (XX). Chromosomal sex is determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. How do u determine sex of an adult? 05-04-2022 Dr.Umesh K H 29
  • 30. • Ischial arch is wider in females so that outlet is larger.Conjugate diameter and transverse diameter are larger in female.Obturator foramen is also larger in females. • Adult male horse have large prominent canine teeth situated in interdental space which are absent in females. How to estimate the sex of animal ? 05-04-2022 Dr.Umesh K H 30