DSpace
 
  Repositório Institucional da Universidade de Aveiro > Departamento de Biologia > BIO - Artigos >
 Reproductive performance of wild boar females in Portugal
Please use this identifier to cite or link to this item http://hdl.handle.net/10773/6403

title: Reproductive performance of wild boar females in Portugal
authors: Fonseca, C
da Silva, AA
Alves, J
Vingada, J
Soares, AMVM
keywords: Reproductive phenology
Litter size
Wild boar management
Sus scrofa
Central Portugal
issue date: 2011
publisher: Springer Verlag
abstract: Reproductive tracts of 214 female wild boars collected in Central Portugal between October and February over the period 1997 to 2001 were examined. From this material, we were able to determine reproductive phenology (conception and birth periods) as well as age and weight of sows at puberty, ovulation rates of adults, foetal sex ratio, levels of intrauterine mortality, final litter size and postnatal mortality. Differences between year, region, age and body weight were analysed. A total of 66.8% of the females examined were gestating or lactating and 96.3% of these weighed > 40 kg. The highest proportions of pregnant sows were found in the adult age/weight classes (74%). None of the juvenile females (1 year old and younger) were lactating and only 7% was pregnant. The average number of foetuses/female (4.1 +/- 1.2SD) and that of corpora lutea per female (4.6 +/- 1.7SD) increased from lighter and younger to heavier and older wild sows. Foetal sex ratio was biased towards males (1.3:1). Observed intrauterine mortality rate (9.7%) and postnatal mortality (6.3%) were among the lowest recorded in European wild boar populations. The productivity rate of the Central Portuguese wild boar population was calculated as 1.1 young per individual in the population. Conception and birth periods did not differ significantly between the considered 4 years. Birth synchronisation was pronounced in all the years, with a peak of births occurring in March.
URI: http://hdl.handle.net/10773/6403
ISSN: 1612-4642
publisher version/DOI: http://dx.doi.org/10.1007/s10344-010-0441-6
source: European Journal of Wildlife Research
appears in collectionsBIO - Artigos

files in this item

file description sizeformat
237_EJWR_2011_57_363.pdf372.61 kBAdobe PDFview/open
Restrict Access. You can Request a copy!
statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! RCAAP OpenAIRE DeGóis
ria-repositorio@ua.pt - Copyright ©   Universidade de Aveiro - RIA Statistics - Powered by MIT's DSpace software, Version 1.6.2