Egg production performance of first and second filial generation naked neck (NaNa, Nana) and normal feathered (nana) birds of a cross between indigenous naked neck (NaNa, Nana) males and exotic commercial females (nana)

摘要

Anexperimentwasconductedtocomparethelayingperformanceoffirstandsecondfilialgenerationbirds(nakedneck,NanaandNaNaandnormalfeathered,nana)ofacrossbetweenindigenousnakedneckmales(Nana)andexoticcommercialfemales(nana)undersemi-intensivesystem.Thecrossingproducedoffspringintheproportionof48.7%Nana(390birds)to51.3%nana(410birds)intheF1generation.Thetwogenotypes(Nana,nana)werecomparedinaRandomizedCompleteBlockDesign(RCBD)experiment,withthethreevillages,wherethebirdswereraised,asblocksandthetwogenotypes(Nana,nana)astreatments.Eachblockhad240birds,120eachofNanaandnanalayers.nbsp;Nanabirdsweresignificantly(P0.05)higherinnumberofeggsperclutch,nbsp;hen-housedandhen-dayratesoflay,eggsizeandsurvivability,thantheirnanacounterparts.However,ageatfirsteggandeggsizetobodyweightratioweresignificantlybetterinthenanabirdscomparedtotheNanaones.Inthesecondmating,malesandfemalesofF1Nanabirdswereselectedandmatedinterse.Thisproduced16.8%NaNa(202birds),54.5%Nana(654birds)and28.7%nana(344birds)offspringintheF2generationandthesewerecomparedinaRandomizedCompleteBlockDesign(RCBD)experiment,withthethreevillages,wherethebirdswereraised,asblocksandthethreegenotypes(NaNa,Nanaandnana)astreatments.Eachblockhad270birds,90eachofNaNa,Nanaandnanalayers.ItwasobservedthatNanaandNaNabirdsweresignificantly(P0.05)higherinnumberofeggsperclutch,hen-housedandhen-dayratesoflay,eggsizeandsurvivability.nbsp;Usingbirdsthatshowthenakedneckphenotypeinlocalchickenproductionwillenhanceeggproductionperformancesignificantly.