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Opposing offspring sex ratio variations with increasing age and weight in mouflon mothers (Ovis musimon)

Landete-Castillejos, T. and Garcia, A. and Langton, S. and Inglis, I. and Gallego, L. and Garde, J. (2001) Opposing offspring sex ratio variations with increasing age and weight in mouflon mothers (Ovis musimon). Acta Veterinaria Hungarica, 49 (3). pp. 257-268. ISSN 0236-6290

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Abstract

There are two main theories explaining offspring sex biases in polygynous mammals. Trivers and Willard (1973) argue that mothers with greater reproductive resources should invest in the sex with the greater variance in reproductive success, usually sons. In contrast, because daughters in many polygynous mammals stay with their mother and compete with her for food, Local Resource Competition theory (e.g. Clark, 1978; Silk, 1983) predicts that the mothers with the greatest reproductive resources should invest in daughters. We investigated the strategy of sex allocation of a captive, outdoor population of 139 mouflon mothers, Ovis musimon, kept in a game state. A complex picture emerged in which, despite weight and body condition being correlated with age in female mouflons, mothers lambed more daughters with increasing age but also, within a given age, gave birth to more sons with increasing weight. Results may be useful in game management aimed at increasing the recruitment or quality o f males in managed populations.

Item Type: Article
Subjects: S Agriculture / mezőgazdaság > SV Veterinary science / állatorvostudomány
Depositing User: xKatalin xBarta
Date Deposited: 17 Feb 2017 12:28
Last Modified: 17 Feb 2017 12:28
URI: http://real.mtak.hu/id/eprint/49389

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