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On the reproduction of female wild boar (Sus scrofa) in Sweden

Malmsten, Anna (2017). On the reproduction of female wild boar (Sus scrofa) in Sweden. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2017:86
ISBN 978-91-7760-062-6
eISBN 978-91-7760-063-3
[Doctoral thesis]

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Free-ranging wild boar (Sus scrofa) have been part of the Swedish fauna for thousands of years. Due to high hunting pressure and domestication, the species became extinct in the 17th century. After escapes from enclosures during the 1970-1980s, the numbers of wild boar in the southern part of the country increased steadily and today likely exceed 200,000 animals. To understand the population dynamics of wild boar, understanding of its reproductive period, oestrous cycle and reproductive potential is essential. The aim of this work was to increase the knowledge on female wild boar reproduction in Sweden.
The study was based on macroscopic examinations of reproductive organs (ovarian structures in relation to the appearance of, and findings in, the uterus) from 617 hunter-harvested female wild boar (>30 kg body weight), sampled in 2012 to 2015 on seven private estates, located in four Swedish regions. The age of the animals was determined, and body weight noted. The crown-rump length (CRL) of the embryos/foetuses was used to calculate the oestrous month and timing of expected farrowing. Sera were analysed by commercial enzyme-linked immunosorbent assays (ELISA) in order to investigate the prevalence of nine selected pathogens.
Uterus weight and length mirrored the present reproductive stage. In approximately
10 % of the examined animals, reproductive abnormalities such as return to oestrus, disturbed oestrous cycle, endometritis and embryo/foetal mortality were found. Of animals aged < 12 months, 11.4 % were classified as post-pubertal which was low compared to previous European studies. The proportion of post-pubertal animals increased with age and weight, and from summer to spring, suggesting a seasonal reproductive pattern. Although, the majority of all studied animals showed a seasonal reproductive pattern, farrowing also occured ‘off-season’. The reproductive potential was high compared to other countries, and increased with age and weight, as did pregnancy rate. High sero-prevalence of Porcine parvo virus, Porcine circo virus type 2, Erysipelotrix rhusiopathiae, and Mycoplasma hyopneumoniae was found. No antibodies were detected against Porcine respiratory and reproductive syndrome virus, Brucella suis, or Mycobacterium bovis. In total, this work contributes to improved knowledge about wild boar reproduction in Sweden, which is of importance for wild boar management.
Keywords: oestrous stage, puberty, reproductive potential seasonality, serology.

Authors/Creators:Malmsten, Anna
Title:On the reproduction of female wild boar (Sus scrofa) in Sweden
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2017
Depositing date:28 September 2017
Number of Pages:75
IMalmsten, A., Jansson, G. & Dalin, A-M. (2016). Postmortem examination of the reproductive organs of female wild boars (Sus scrofa) in Sweden. Reproduction in Domestic Animals. Doi:10.1111/rda.12947.
IIMalmsten, A. & Dalin, A-M. (2015). Puberty in female wild boar (Sus scrofa) in Sweden. Acta Veterinaria Scandinavica, 58:55. Doi:10.1186/s13028-016-0236-1.
IIIMalmsten, A., Jansson, G., Lundeheim, N. & Dalin, A-M. (2017). The reproductive pattern and potential of free ranging female wild boars (Sus scrofa) in Sweden. Acta Veterinaria Scandinavica, 59:52. Doi:10.1186/s13028-017-0321-0.
IVMalmsten, A., Magnusson, U., Ruiz-Fons, F. & Dalin, A-M. A serological survey of selected pathogens in wild boar (Sus scrofa) in Sweden. Submitted manuscript.
Place of Publication:Uppsala
Publisher:Departement of Clinical Sciences, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-062-6
ISBN for electronic version:978-91-7760-063-3
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L53 Animal physiology - Reproduction
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Agrovoc terms:wild boars, sus scrofa, reproduction, sweden
Keywords:oestrus stage, puberty, reproductive potential, reproductive seasonality, serology
Permanent URL:
ID Code:14587
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Clinical Sciences
Deposited By: Dr Anna Malmsten
Deposited On:28 Sep 2017 10:46
Metadata Last Modified:09 Sep 2020 14:17

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