Effect of inbreeding on fertility traits in five dog breeds

Joanna Kania-Gierdziewicz , Sylwia Pałka


The aim of the study was to analyze retrospectively the influence of inbreeding on fertility traits in five dog breeds: German Shepherd dog (GSD), Golden (GR) and Labrador (LR) Retrievers, Beagle and the Tatra Shepherd dog (TSD). The data were 436 litters, with the total of 2560 puppies: 1307 males and 1206 females. The parents of the litters were 163 dogs and 228 bitches. For each litter the litter size, number of male and female puppies, sex ratio, and sex difference were calculated. The fixed effects of breed, of litter birth year and linear regression coefficients on litter and parents’ inbreeding were included in the linear model for litter traits. The correlations between litter traits and litter parents’ inbreeding were also estimated. The average litter size was 5.87 (± 2.53) for all breeds. GSD had the smallest average litter size differences in years and the lowest fluctuations of sex ratio with litter size. In other dog breeds those differences were much bigger. The difference between the number of male and female offspring in a litter depended on the breed. The lowest percentage of inbred parents was found for LR, and the highest for TSD. Mating non-inbred animals, in most cases also unrelated, was frequent in all breeds. The inbreeding level of parents had significant influence on the litter traits only for TSD. For the Beagles low, positive and significant correlation between the number of female offspring in a litter and the dam’s inbreeding level and the sex ratio below 0.5 suggests sex ratio disturbance. The correlation coefficients between litter inbreeding and litter size for majority of examined dog breeds were positive but not significant. The conclusion is that in Poland at first obligatory monitoring of the inbreeding level for all breeds should be applied.
Author Joanna Kania-Gierdziewicz (FoAS / DoGaAIM)
Joanna Kania-Gierdziewicz,,
- Department of Genetics and Animal Improvement Methods
, Sylwia Pałka (DoAS / DoGaAIM)
Sylwia Pałka,,
- Department of Genetics and Animal Improvement Methods
Journal seriesCzech Journal of Animal Science, ISSN 1212-1819, e-ISSN 1805-9309, (N/A 70 pkt)
Issue year2019
Publication size in sheets0.55
Keywords in Englishdog; reproduction; litter size; sex ratio; inbreeding effect
ASJC Classification1103 Animal Science and Zoology
URL https://www.agriculturejournals.cz/web/cjas.htm?type=article&id=104_2017-CJAS
Internal identifierWHiBZ/2019/12
Languageen angielski
Score (nominal)70
Score sourcejournalList
Publication indicators WoS Citations = 0; Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.774; WoS Impact Factor: 2018 = 1.008 (2) - 2018=1.12 (5)
Citation count*
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FinansowanieSupported by the Ministry of Science and Higher Education of the Republic of Poland (statutory activity, DS No. 3203).
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