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

• Autorzy: Szwaczkowski T , Cywa-Benko K. , Wezyk S.
• Języki publikacji: EN

Abstrakty

EN

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.

PL

Dokonano oceny poziomu inbredu i oszacowano jego wpływ na masę ciała (BW), wiek zniesienia pierwszego jaja (AFE), średnią masę jaja (EW), procent zapłodnienia jaj (PEF) i procent wylęgu z jaj nałożonych (PEH). Obserwacje pochodziły od 9194 kur rodu H77 i N88. Współczynniki inbredu obliczono stosując wzory Wrighta. Poziom inbredu uwzględniono w liniowym modelu zwierzęcia jako zmienną kowariancyjną. Stwierdzono dość niski (jednak z tendencją wzrostową) poziom zinbredowania, nie przekraczający 3.5%. Generalnie, efekty inbredu były niewielkie (z wyjątkiem procentu zapłodnienia jaj).Oszacowane estymatory odziedziczalności cech korespondowały z danymi zawartymi w piśmiennictwie.

Słowa kluczowe

EN

hen; laying hen; inbreeding; laying performance; egg hatching; egg trait; reproductive trait; heritability

• Wydawca: -
• Czasopismo: Animal Science Papers and Reports
• Rocznik: 2003
• Tom: 21
• Numer: 2
• Opis fizyczny: p.121-129,fig.

Twórcy

autor

Szwaczkowski T

• Agricultural University, Wolynska 33, 60-637 Poznan, Poland

autor

Cywa-Benko K.

autor

Wezyk S.

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