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Wyszukujesz frazę "Kownacki, M" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
The effect of selection for traits of low heritability conducted in noninbred populations on the basis of progeny or performance tests
Autorzy:
Sobczynska, M
Kownacki, M.
Powiązania:
https://bibliotekanauki.pl/articles/2048147.pdf
Data publikacji:
1995
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mouse
heritability
mice
selection method
selection response
performance test
progeny
Opis:
The investigations were carried out to compare selection conducted on the basis of progeny with that on the basis of animals'own performance. Selection was conducted for the body weight at weaning (at the age of 21 days), which is a trait of low heritability (h²=0.1). It was run throughout 15 generations, whereas in generations 13 and 14 three experimental replicas were crossed to obtain population free of inbreeding. A cumulated response to selection was higher in the group selected on the basis of animals' own performance, but after crossing the replicas it decreased clearly in the both groups. The cumulated selection differential was higher in the group selected on the basis of animals' own performance. However, a statistical analysis of the obtained results showed no significant difference between the two selection methods.
Źródło:
Journal of Applied Genetics; 1995, 36, 2; 169-175
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Genetic aspects of racing performance in Polish pure-bred Arab horses. I. Genetic parameters
Autorzy:
Sobczynska, M
Kownacki, M
Powiązania:
https://bibliotekanauki.pl/articles/2047090.pdf
Data publikacji:
1997
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
racing performance
horse
heritability
animal breeding
purebred Arabian breed
genetic parameter
Opis:
The objective of this study was to estimate variance components of Polish Arab horses’ racing performance. The traits studied were the log of annual earnings and rank. Fixed effects of the year of race, herd, sex, the annual number of starts and random animal and permanent environment effects were evaluated on both earnings and rank at finish in Polish Arab horses. The obtained data included 2243 records on 4- and 5-year-old horses by 143 sires. Only races in which 4- and 5-year-olds competed were used. Heritability estimates of earnings and rank at finish were 0.22 and 0.25, respectively. Repeatability estimates of these traits were the same as heritability estimates. All the estimates of genetic and phenotypic correlations between the log of earnings and rank at finish were high and positive. Earnings and rank are good criteria for genetic improvement. Rank seems to be a better measure of racing performance.
Źródło:
Journal of Applied Genetics; 1997, 38, 2; 179-186
1234-1983
Pojawia się w:
Journal of Applied Genetics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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