Abstract
The aim of the present research is to investigate breeders’ management strategies and their effects on reproductive performances in heritage breeds. A total of 468 litters were analysed: Belgian Hare (N = 151), Burgundy Fawn (N = 105), Californian (N = 212). Litter size (born alive), percentage of weaned kits and percentage of selected kits were analysed using a model that included the effects of breed, year of birth, litter’s origin (with three levels: both internal parents = 0, one outside parent = 1 both outside parents = 2) and their interactions (breed*year of birth, breed*litter’s origin, year of birth*litter’s origin, breed*year of birth*litter’s origin). Besides, number of litters per buck and number of litters per doe were analysed using a model with only effect of breed. All these analyses were carried out with SPSS software. No effects of breeds on litter size, percentage of weaned and percentage of selected kits were found. Year of birth presented significant effects on litter size and percentage of weaned kits (p ≤ 0.05). The inclusion of external breeders didn’t significantly influence analysed reproductive data. The number of litters per buck and per doe were not influenced by breed. The frequency of external breeders’ inclusion is breed specific. Data recording is a basic step in phenotypical characterization, our results supply some information about breeders’ management strategies and their effects on some reproductive parameters. Our results show breed specific frequencies of inclusions of external breeders and a positive effect of management procedures (genetic plus environment) on percentage of weaned kits according to the year of birth. HIGHLIGHTS Breeders management and reproductive parameters have been described The most frequent combination is a home bred doe mated to an external male A mean of 2 litters per doe and per buck have calculated in all the breeds The frequency of use of external breeders is breed specific
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