Determiantion of age in farm animals.ppt

This presentation covers the methods of determination of age of animals in brief.

1. Age Determination in Veterinary Forensic Medicine Published by: Dr. Desh Deepak Assistant Professor, Veterinary Medicine COVAS, SVPUAT, Meerut

2. Methods of age determination in animals General appearance: on the basis of size, appearance and morphological features of animals Horn rings: Based on counting the number of rings of horns Pattern of teeth eruption aids in estimating the age more appropriately Anatomical features of bone are used for estimation of approx. age in cadavers of animals where age determination by other methods is not possible.

3. Horn Rings Method Age of cattle = Number of rings on horn + 1 Horn Ring First ring appears at the age of two years and then one ring appears annually.

4. Dentition Formula of animals Dentition Temporary Permanent C/B/S/G 003/403=20 0033/4033=32 Equine 303/303=24 313(4)3/3133=40-42 Swine 313/313=28 3143/3143=44 Dog 313/313=28 3142/3143=42 Cat 313/312=26 3131/3121=30

5. Types of Teeth

6. Age Determination Deciduous dentition di1 At Birth di2 di3 Birth to 01 week di4 Birth to 02 week dp1 Birth to 03 week dp2 dp3

7. Age Determinatio n Permanent dentition M1 5-6 month M2 1-1.5 Year M3 2-2.5 Year i1 1.2-2 Year i2 2-2.5 Year i3 3 Year i4 3.5-4 year

8. Age Determination Wearing of teeth 4-5 Year Exposed root 6 Year Greater part of crown degraded 10 Year Only stump remains & teeth are widely separated from each other 12-14 year Teeth close again 16 Year

9. Deciduous versus permanent dentition

10. Temporary incisors in a calf

11. Three pair of incisors with corner milk incisors

12. Dentition Formula

13. Two permanent incisors

14. Solid Mouth

15. Narrowing of incsisors

16. Two permanent incisors

17. Broken versus smooth mouth

18. Conclusion

19. Age Determination in horse Deciduous dentition di1 Birth to 1 week di2 4-6 week di3 6-9 week dp1 Birth to 2 week dp2 dp3

20. Age Determination P1 5-6 mopnth M1 9-12 month M2 2 Year M3 3.5-4.0 Year C 3.5-5 Year i1 2.5 Year i2 3.5 year i3 4.5 year

21. Age Determination in Horse Six year age Incisors meet at right angle Till 20 year age Incline forward and meet at an acute angle 20-30 year age Almost horizontally placed 8 years age Infundibulum disappear from incisors 10 years age Galvayne’s groove make it appearance 15 years age Galvayne’s groove reach half way down 20 years age Galvayne’s groove reach bottom of the tooth 25 years age Galvayne’s groove disappear from upper part of the tooth 30 years age Galvayne’s groove disappear completely Infundibulum is dark depressed ring present on the table of permanent incisors of horse

22. Dental Star

23. Galvayne’s Groove

24. Age Determination in sheep & goat Deciduous dentition di1 Birth to 01 week di2 01-02 week di3 02 to 03 week di4 03 to 04 week dp1 Birth to 04 weeks dp2 dp3

25. Age Determination in Sheep & Goat Permanent dentition M1 3 to 5 month M2 9 to 12 month M3 1.5 to 2.0 Year i1 1.0 to 1.5 Year i2 1.5 to 2.0 Year i3 2.5 to 3.0 Year i4 3.0 to 4.0 year P1, P2 & P3 1.5 to 2.0 Year Age at full mouth : 03 Years 03 Months