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1

Genetic, phenotypic and environmental trends of conformation traits in arctic fox Alopex lagopus (L.)

100%
Wierzbicki H., Filistowicz A., Przysiecki P.
Journal of Applied Genetics
|
2000
|
vol. 41
|
issue 2
113-122
EN
Data on 3782 arctic foxes, bred on a Sniaty fox farm (Poland) in 1985-1998 were used to estimate the genetic, phenotypic and environmental trends of conformation traits. Body size (BS), colour type (CT), colour purity (CP), coat density (CD), hair length (HL), general appearance (GA) and total score (TS) were analysed. The BLUP with a single-trait animal model was used to estimate the genetic trends. The estimates of genetic and phenotypic trends were positive for BS, CT, CP, HL, GA, TS and ranged from 0.0006 to 0.0995 point/year and from 0.0100 to 0.1302 point/year, respectively, but were negative for CD (- 0.0374 point/year and - 0.0262 point/year, respectively). The environmental trends ranged from - 0.0024 point/year for CT to 0.0304 point/year for TS.
2

Genetic parameters of conformation and coat traits in fox (Vulpes vulpes) population

88%
Filistowicz A., Wierzbicki H., Zwolinska-Bartczak I., Zuk B.
Journal of Applied Genetics
|
1999
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vol. 40
|
issue 3
211-217
EN
The aim of this paper was to estimate heritabilities and genetic, environmental and phenotypic correlations between conformation and coat traits of animals, and to determine on this basis the further direction of fox breeding improvement. 2072 individuals were studied. The model included a fixed effect of birth year of individuals and random effects of sire and dam mated in a given year with a given sire. Probit transformation was used because conformation and coat traits are evaluated on a discrete scale and their distribution strongly differs from the normal distribution. The obtained heritabilities of conformation traits show that selection on total conformation evaluation, hair length and general appearance of the animal should be characterised by a rather high effectiveness. Selection on body size and colour type of coat is the least promising. Genetic correlations between evaluation of total conformation and the other traits show that selection of this trait should improve (correlated response) all the other traits except body size and colour type. Body size is positively and relatively highly correlated genetically with the amount of silver and hair length, so inclusion of these traits, beside total conformation evaluation, can ensure indirect improvement of animal body size.
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