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

T. Landete-Castillejos; A. Garcia; S. Langton; I. Inglis; L. Gallego; J. Garde

doi:10.1556/004.49.2001.3.1

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Acta Veterinaria Hungarica

Volume/Issue:: Volume 49: Issue 3

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

Authors:

T. Landete-Castillejos

T. Landete-Castillejos Sección de Recursos Cinegéticos, IDR, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
Departamento de Ciencia y Tecnología Agroforestal, ETSIA, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
Instituto de Investigación en Recursos Cinegéticos (CSIC-UCLM-JCCLM), SecciónAlbacete, Universidad de Castilla-La Mancha, 02071 Albacete, Spain

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landete@cita-ab.uclm.es

A. Garcia

A. Garcia Sección de Recursos Cinegéticos, IDR, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
Departamento de Ciencia y Tecnología Agroforestal, ETSIA, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
Instituto de Investigación en Recursos Cinegéticos (CSIC-UCLM-JCCLM), SecciónAlbacete, Universidad de Castilla-La Mancha, 02071 Albacete, Spain

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S. Langton

S. Langton MAFF Central Science Laboratory, Sand Hutton, York, UK

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I. Inglis

I. Inglis MAFF Central Science Laboratory, Sand Hutton, York, UK

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L. Gallego

L. Gallego Departamento de Ciencia y Tecnología Agroforestal, ETSIA, Universidad de Castilla-La Mancha, 02071 Albacete, Spain

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, and

J. Garde

J. Garde Departamento de Ciencia y Tecnología Agroforestal, ETSIA, Universidad de Castilla-La Mancha, 02071 Albacete, Spain
Instituto de Investigación en Recursos Cinegéticos (CSIC-UCLM-JCCLM), SecciónAlbacete, Universidad de Castilla-La Mancha, 02071 Albacete, Spain

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Pages:: 257–268

Online Publication Date:: Aug 2001

Publication Date:: 01 Aug 2001

Article Category:: Journal Article

DOI:: https://doi.org/10.1556/004.49.2001.3.1

Keywords:: Parental investment; reproduction; sex ratio variation; birth sex ratios; mouflon; Local Resource Competition strategy; Trivers—Willard strategy; age; weight; Spain

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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.

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Acta Veterinaria Hungarica

Print ISSN:: 0236-6290

Online ISSN:: 1588-2705

Editorial Board

Mária BENKŐ (Acta Veterinaria Hungarica, Budapest, Hungary)
Gábor BODÓ (University of Veterinary Medicine, Budapest, Hungary)
Béla DÉNES (University of Veterinary Medicine, Budapest Hungary)
Edit ESZTERBAUER (Veterinary Medical Research Institute, Budapest, Hungary)
Hedvig FÉBEL (University of Veterinary Medicine, Budapest, Hungary)
László FODOR (University of Veterinary Medicine, Budapest, Hungary)
János GÁL (University of Veterinary Medicine, Budapest, Hungary)
Balázs HARRACH (Veterinary Medical Research Institute, Budapest, Hungary)
Peter MASSÁNYI (Slovak University of Agriculture in Nitra, Nitra, Slovak Republic)
Béla NAGY (Veterinary Medical Research Institute, Budapest, Hungary)
Tibor NÉMETH (University of Veterinary Medicine, Budapest, Hungary)
Zsuzsanna NEOGRÁDY (University of Veterinary Medicine, Budapest, Hungary)
Dušan PALIĆ (Ludwig Maximilian University, Munich, Germany)
Alessandra PELAGALLI (University of Naples Federico II, Naples, Italy)
Kurt PFISTER (Ludwig-Maximilians-University of Munich, Munich, Germany)
László SOLTI (University of Veterinary Medicine, Budapest, Hungary)
József SZABÓ (University of Veterinary Medicine, Budapest, Hungary)
Péter VAJDOVICH (University of Veterinary Medicine, Budapest, Hungary)
János VARGA (University of Veterinary Medicine, Budapest, Hungary)
Štefan VILČEK (University of Veterinary Medicine in Kosice, Kosice, Slovak Republic)
Károly VÖRÖS (University of Veterinary Medicine, Budapest, Hungary)
Herbert WEISSENBÖCK (University of Veterinary Medicine, Vienna, Austria)
Attila ZSARNOVSZKY (Szent István University, Gödöllő, Hungary)

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Acta Veterinaria Hungarica
Language	English
Size	A4
Year of Foundation	1951
Volumes per Year	1
Issues per Year	4
Founder	Magyar Tudományos Akadémia
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