TOOTH WEAR IN CAPTIVE GIRAFFES (GIRAFFA CAMELOPARDALIS): MESOWEAR ANALYSIS CLASSIFIES FREE-RANGING SPECIMENS AS BROWSERS BUT CAPTIVE ONES AS GRAZERS
- 1 September 2007
- journal article
- Published by American Association of Zoo Veterinarians in Journal of Zoo and Wildlife Medicine
- Vol. 38 (3), 433-445
- https://doi.org/10.1638/06-032.1
Abstract
Captive giraffe (Giraffa camelopardalis) mostly do not attain the longevity possible for this species and frequently have problems associated with low energy intake and fat storage mobilization. Abnormal tooth wear has been among the causes suggested as an underlying problem. This study utilizes a tooth wear scoring method ("mesowear") primarily used in paleobiology. This scoring method was applied to museum specimens of free-ranging (n=20) and captive (n=41) giraffes. The scoring system allows for the differentiation between attrition--(typical for browsers, as browse contains little abrasive silica) and abrasion--(typical for grazers, as grass contains abrasive silica) dominated tooth wear. The dental wear pattern of the free-ranging population is dominated by attrition, resembles that previously published for free-ranging giraffe, and clusters within browsing herbivores in comparative analysis. In contrast, the wear pattern of the captive population is dominated by abrasion and clusters among grazing herbivores in comparative analyses. A potential explanation for this difference in tooth wear is likely related to the content of abrasive elements in zoo diets. Silica content (measured as acid insoluble ash) is low in browse and alfalfa. However, grass hay and the majority of pelleted compound feeds contain higher amounts of silica. It can be speculated that the abnormal wear pattern in captivity compromises tooth function in captive giraffe, with deleterious long-term consequencesKeywords
This publication has 12 references indexed in Scilit:
- Energy and Fibre Intake in a Group of Captive Giraffe (Giraffa camelopardalis) Offered Increasing Amounts of BrowseJournal of Veterinary Medicine Series A, 2005
- MORTALITY OF CAPTIVE GIRAFFE (GIRAFFA CAMELOPARDALIS) ASSOCIATED WITH SEROUS FAT ATROPHY: A REVIEW OF FIVE CASES AT AUCKLAND ZOOJournal of Zoo and Wildlife Medicine, 2005
- Enamel hypoplasia provides insights into early systemic stress in wild and captive giraffes (Giraffa camelopardalis)Journal of Zoology, 2004
- Differential mesowear in occluding upper and lower molars: Opening mesowear analysis for lower molars and premolars in hypsodont horsesJournal of Morphology, 2003
- Comparative use of four different marker systems for the estimation of digestibility and low food intake in a group of captive giraffes (Giraffa camelopardalis)Zoo Biology, 2001
- Functional Characterization of Ungulate Molars Using the Abrasion-Attrition Wear Gradient: A New Method for Reconstructing PaleodietsAmerican Museum Novitates, 2000
- ON THE MEANS WHEREBY MAMMALS ACHIEVE INCREASED FUNCTIONAL DURABILITY OF THEIR DENTITIONS, WITH SPECIAL REFERENCE TO LIMITING FACTORSBiological Reviews, 1988
- Feed selection and digestibility by captive giraffeZoo Biology, 1985
- A Literature Review of Dental Pathology and Aging by Dental Means in Nondomestic Animals: Part IIThe Journal of Zoo Animal Medicine, 1979
- Notes on the teeth and ovaries of an African elephant (Loxodonta africana) of known ageJournal of Zoology, 1969