MORPHOMETRY AND AGEING OF CAPTIVE MALE ASIAN ELEPHANTS {Elephas maximus)
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Date
2003
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES-MANNUTHY,THRISSUR
Abstract
The collection of morphometric details from elephants of different age
groups would enhance our biological understanding and management of this
valuable species. A total of fifty two clinically healthy captive male Asian
elephants, varying in age, under excellent management, maintained by
'Guruvayoor Devaswom Board' were utilized for predicting body weight and
height from body measurements as well as determination of age from physical
features.
For prediction equations several morphometric parameters were
measured. All possible linear regressions of weight on one, two, three and four
body measurements were calculated. The equations having highest coefficient
determination value (R^) with least standard error of estimation was taken for
predicting body weight and height in elephants. The data were also divided into
age groups (Group I (Young ones; 0-20 years). Group II (Sub adults; 21-30
years). Group III (Adults; 31-40 years), and Group IV (Old adults; 41-70 years))
and all possible linear regressions were calculated for each group.
The best prediction of body weight (kg) for all age groups (G 1 to G IV)
was obtained based on two parameters; the chest girth (cm) and right forefoot
circumference (cm). Single and also the combination of various parameters were
used for the prediction of body weight in different age groups. An equation to
predict the height at the shoulders (cm) from right forefoot circumference (cm)
for various age groups of elephants was also derived.
Various parameters were correlated with age of the elephants and average
values of these parameters were calculated for age approximation.
The data were again divided into various age groups (Group A (Young
ones; 0-20 years). Group B (Adults; 21-40 years), and Group C (Old adults; 41
70 years)) and comparison of parameters between two age groups was done. The
parameters such as dcpigmcntation on the trunk, hair distribution, iiollow on the temple region, width of the ear, circumference of tusk base and middle, and
height at the shoulders had high correlation as well as significant difference in
various age group comparisons. So, these parameters could be useful for age
estimation in male elephants with more precision.
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KVASU REFERENCE CITATION