Age and sex determination of gaur Bos gaurus (Bovidae)
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Farshid S. Ahrestani
und
Herbert H.T. Prins
Abstract
One reason why the gaur Bos gaurus is a poorly understood species is because there are no reliable data to age and sex individuals. We studied captive gaur for two years in Mysore Zoo, India and Omaha Zoo, USA, and determined age-specific differences in morphological features and physical growth, by measuring shoulder height, of male and female gaur. We fitted von Bertalanffy growth functions to the shoulder height data and found maximum shoulder heights of 175 cm and 147 cm for males and females, respectively. This study ascertained for the first time that the greater the amount of white on the horns of a gaur, the older it is, and that the sexes can be distinguished based on horn shape and size differences. We found that gaur aged 15 months and below can be classified into three age classes, but are difficult to sex. The sex of gaur aged 15–36 months is best determined by a study of their horns. Adult gaur, greater than three years, are easy to sex, but are difficult to classify into single-year age classes and are reliably classified only into two age classes for females and three for males.
©2011 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- Publisher’s note
- Publisher’s note
- REVIEW
- Anthropochorous mammals of the Old World in the West Indies
- ORIGINAL STUDIES
- Inter-individual variations in male and female mating bonds within a population of Eld’s deer in Hainan Island, China
- Age and sex determination of gaur Bos gaurus (Bovidae)
- Population structure of Farasan gazelle
- Increasing bat abundance in a major winter roost in central Poland over 30 years
- Predation on Cacajao ouakary and Cebus albifrons (Primates: Platyrrhini) by harpy eagles
- Morphofunctional and geographic segregation among species of lasiurine bats (Chiroptera: Vespertilionidae) from the South American Southern Cone
- Investigation of habitat preferences of Iranian jerboa (Allactaga firouzi Womochel 1978)
- SHORT NOTES
- Enlarging the knowledge on Graomys griseoflavus (Rodentia: Sigmodontinae) in Patagonia: distribution and environments
- The genus Rhagomys (Thomas 1917) (Rodentia, Cricetidae, Sigmodontinae) in South America: morphological considerations, geographic distribution and zoogeographic comments
- Prey selection and food habits of leopard (Panthera pardus fusca) in Sariska Tiger Reserve, Rajasthan, India
- Diet of the Eurasian otter Lutra lutra on small watercourses in Western Poland
- Book reviews
Artikel in diesem Heft
- Publisher’s note
- Publisher’s note
- REVIEW
- Anthropochorous mammals of the Old World in the West Indies
- ORIGINAL STUDIES
- Inter-individual variations in male and female mating bonds within a population of Eld’s deer in Hainan Island, China
- Age and sex determination of gaur Bos gaurus (Bovidae)
- Population structure of Farasan gazelle
- Increasing bat abundance in a major winter roost in central Poland over 30 years
- Predation on Cacajao ouakary and Cebus albifrons (Primates: Platyrrhini) by harpy eagles
- Morphofunctional and geographic segregation among species of lasiurine bats (Chiroptera: Vespertilionidae) from the South American Southern Cone
- Investigation of habitat preferences of Iranian jerboa (Allactaga firouzi Womochel 1978)
- SHORT NOTES
- Enlarging the knowledge on Graomys griseoflavus (Rodentia: Sigmodontinae) in Patagonia: distribution and environments
- The genus Rhagomys (Thomas 1917) (Rodentia, Cricetidae, Sigmodontinae) in South America: morphological considerations, geographic distribution and zoogeographic comments
- Prey selection and food habits of leopard (Panthera pardus fusca) in Sariska Tiger Reserve, Rajasthan, India
- Diet of the Eurasian otter Lutra lutra on small watercourses in Western Poland
- Book reviews
