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1

Genetic aspects of racing performance in Polish pure bred Arab horses. II.Genetic trends

100%
Sobczynska M., Kownacki M.
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issue 3
303-308
EN
The objective of this study was to estimate genetic trends in the Polish Arab horses population. Annual earnings and rank at finish in flat races of Polish Arab horses from 1951 to 1993 were analysed with a BLUP animal model. The collected data included 2,234 records of 1,640 4 and 5 year old horses from 143 sires. Only races, in which horses of at least two mentioned age groups took part, were taken into consideration. The model included an individual additive genetic effect as random, the year of race, herd, sex, age, number of starts and the year of race ? age effects as fixed effects. Genetic trends were estimated from differences between horses belonging to different age groups and racing in the same year. The annual genetic gains from 1951 to 1993 were 3.5% and 12.3% of the genetic standard deviation for the log of earnings and rank at finish, respectively. Although the main role in breeding Arab horses is played by beauty and exterior, small genetic progress in the log of earnings and rank at finish was obtained.
2

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
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2000
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vol. 41
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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.
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