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.: Home > Animal Science Papers and Reports > 2003 > Volume 21 Number 2 > Tomasz Szwaczkowski1, Katarzyna Cywa-Benko2, Stanis³aw Wê؟yk2

A note on inbreeding effect on productive and reproductive traits in laying hens

Tomasz Szwaczkowski1, Katarzyna Cywa-Benko2, Stanis³aw Wê؟yk2
1 Department of Genetics and Animal Breeding, The August Cieszkowski Agricultural University of Poznaٌ, Wo³yٌska 33, 60-637 Poland, Poland 2 Department of Poultry Breeding, National Institute of Animal Production, Krakowska 1, 32-083 Balice/Cracov, Poland
Abstract :

Inbreeding rate and effects on production (body weight, age at first egg, egg weight), and reproduction (per cent of eggs fertilized, per cent of eggs hatched as related to eggs set) traits were evaluated in 9194 layers belonging to two strains. The individual inbreeding coefficients were calculated using Wright’s formula from available performance records across nine generations. The inbreeding effects (including linear covariable) were estimated by derivative-free restricted maximum likelihood algorithm under an animal model. In general, the inbreeding level appeared relatively low in both populations. The inbreeding depressions for the traits studied (except per cent of eggs fertilized) were found low. The heritability estimates of productive and reproductive traits corresponded with those reported in literature.

Keywords :
chicken / heritability / inbreeding / laying performance

Date Deposited : 12 Aug 2011 09:53

Last Modified : 12 Aug 2011 09:53

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Volume 21, Number 2, - 2003

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