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RESEARCH ARTICLE
Contents Vol 32(6)

Determining the age of adult wild dogs (Canis lupus dingo, C. l. domesticus and their hybrids). I. Pulp cavity : tooth width ratios

Kristan Kershaw A , Lee Allen B , Allan Lisle C and Kerry Withers A
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- Author Affiliations

A Department of Biological and Physical Sciences, University of Southern Queensland, Toowoomba, Qld 4350, Australia.

B Robert Wick Pest Animal Research Centre, Natural Resources and Mines, PO Box 318, Toowoomba, Qld 4350, Australia.

C School of Agronomy and Horticulture, The University of Queensland, Gatton, Qld 4343, Australia.

Wildlife Research 32(6) 581-585 https://doi.org/10.1071/WR03109
Submitted: 27 November 2003  Accepted: 4 July 2005   Published: 18 October 2005

Abstract

In order to determine the age of adult wild dogs, we compared two methods (that of Thomson and Rose (TR method) and that of Knowlton and Whittemore (KW method)) of measuring and calculating pulp cavity : tooth width ratios on upper and lower canine teeth from 68 mixed-sex, known-age wild dogs of 9 months to 13 years of age reared at two localities. Although significant relationships (P = 0.0001) were found between age and pulp cavity ratios by both methods, the TR ratio calculation and measurement showed heteroscedasity in error variance whereas the KW ratios had a more stable error variance and were normally distributed. The KW method also found significant differences between pulp cavity ratios between teeth of the upper and lower jaws (P < 0.0001) and sex (P = 0.01) but not geographic origin (P = 0.1). Regressions and formulae for fitted curves are presented separately for male and female wild dogs. Males show greater variability in pulp cavity decrements with age than do females, suggesting a physiological difference between the sexes. We conclude that the KW method of using pulp cavity as a proportion of tooth width, measured 15 mm from the root tip and averaged over both upper canines, is the more accurate method of estimating the age of adult wild dogs.


References

Caughley G. (1977). ‘Analysis of Vertebrate Populations.’ (John Wiley and Sons: Brisbane.)

Coman, B. J. (1988). The age structure of a sample of red foxes (Vulpes vulpes L.) taken by hunters in Victoria. Australian Wildlife Research 15, 223–229.
| Crossref | GoogleScholarGoogle Scholar | Corbett L. (1995). ‘The Dingo in Australia and Asia.’ Australian Natural History Series. (University of New South Wales Press: Sydney.)

Fleming P., Corbett L. Harden R., and Thomson P. (2001). ‘Managing the Impacts of Dingoes and Other Wild Dogs.’ (Australian Bureau of Rural Sciences: Canberra.)

Fukuda, S. , and Iida, H. (2000). Effects of orchidectomy on bone metabolism in beagle dogs. Journal of Veterinary Medical Science 62, 69–73.
| Crossref | GoogleScholarGoogle Scholar | PubMed | Kaneko J. J. (1980). ‘Clinical Biochemistry of Domestic Animals.’ 3rd edn. (Academic Press: Sydney.)

Knowlton, F. F. , and Whittemore, S. L. (2001). Pulp cavity–tooth width ratios from known-age and wild caught coyotes determined by radiography. Wildlife Society Bulletin 29, 239–244.


Landon, D. B. , Waite, C. A. , Petersen, R. O. , and Mech, L. D. (1998). Evaluation of age determination techniques for gray wolves. Journal of Wildlife Management 62, 674–682.


Linhart, S. B. , and Knowlton, F. F. (1967). Determining the age of coyotes by tooth cementum layers. Journal of Wildlife Management 31, 363–365.


Root, D. A. , and Payne, N. F. (1984). Evaluation of techniques for aging gray fox. Journal of Wildlife Management 48, 926–933.


Thomson, P. C. , and Rose, K. (1992). Age determination of dingoes from characteristics of canine teeth. Wildlife Research 19, 597–599.
| Crossref | GoogleScholarGoogle Scholar |

Zingeser, M. R. , and Phoenix, C. H. (1978). Metric characteristics of the canine dental complex in prenatally androgenized female rhesus monkeys (Macaca mulatta). American Journal of Physiology and Anthropology 49, 187–192.