Abstract
The objective of the present study was to assess the association between the inbreeding coefficient (F) of German Spitz dogs (litter, sires, and dams) and number of live newborn dogs for this breed. Records of dams and sires of a breeding system were used to calculate the F of 105 litters and their sires and dams and the number of live newborn dogs. The analysis performed through the GLM procedure showed a negative influence of F of litter and [...]
Highlights
Dog breeding systems have become important due to the growth of pet market
The studied sample of German Spitz dogs exhibits inbreeding depression for litter size, which is an important information for breeders and professionals that assist in dog breeding
Litter size is an important trait in dog breeding that is affected by several factors
Summary
Dog breeding systems have become important due to the growth of pet market. Several factors affect prolificacy, including dam size (Bergström et al, 2006), birth season (Gavrilovic et al, 2008; Leroy et al, 2015), and age and health of parents, especially the mother (Borge et al, 2011; Wang et al, 2014; Schrack et al, 2017; Keid et al, 2017; Kendall et al, 2017). Variations in litter size can be found even when evaluating similar animals for these factors, and the heritability for this trait varies between 5.9 and 10.1% (Leroy et al, 2015)
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