Distorted sex ratio at birth in the captive pygmy hippopotamus, Hexaprotodon liberiensis

Zschokke, Samuel. (2002) Distorted sex ratio at birth in the captive pygmy hippopotamus, Hexaprotodon liberiensis. Journal of mammalogy, Vol. 83, no. 3. pp. 674-681.

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Official URL: http://edoc.unibas.ch/dok/A5252268

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The total captive population of the pygmy hippopotamus Hexaprotodon (= Choeropsis) liberiensis had a highly female biased sex ratio at birth (41% males), which exceeded most other known distorted sex ratios in captive mammals. Deviation from an even sex ratio was not compensated by a higher juvenile mortality of females. I examined possible causes of that deviation and could not find any association between offspring sex and inbreeding, parity, or mother's age. I found, however, a significant difference in sex ratios among different zoological gardens, suggesting that husbandry influenced sex at birth in the pygmy hippopotamus. Further analysis suggested that high feeding intensity and hands-on husbandry favored production of daughters. However, not all of the observed patterns and relationships could be explained by classic sex ratio theories.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Integrative Biologie > Naturschutzbiologie (Baur)
UniBasel Contributors:Zschokke, Samuel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Society of Mammalogists
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:28
Deposited On:22 Mar 2012 14:04

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