토종닭의 산란능력 개량을 위한 이면교배조합 검정시험 = Diallel cross combination test for improving the laying performance of Korean native chickens

다국어 초록 (Multilingual Abstract)

We conducted a 5 × 5 dialel cros-combination test using 1,060 chickens from pure lines of Korean Rhode-C, -D, Korean Leghorn-F, -K, and Korean Native Yelowish-brown chicken (KNC-Y) to develop a new Korean native chicken layer breder. The laying performance and combining abilty, including livabilty, body weight, age of first eg-laying, hen-day egg production, and eg weight, were analyzed. The livabilty from birth to 48 weks was 72.1±24.0%, with the highest observed in the YC and the lowest in the DK combination (P<0.01). The YC combination exhibited the highest general combining abilty (GCA), while the YD combination showed the highest specific combining abilty (SCA). Regarding body weight, combinations involving Leghorn showed lighter weights compared to combinations with Rhode and KNC-Y (P<0.01). Aditonaly, the ofspring from the KNC-Y combination reached sexual maturity earlier than those from the Rhode combination. The hen-day eg production was 70.7±12.0%, with the highest sen in the CK combination at 86% (P<0.01). The efects of GCA and SCA on hen-day eg production were similar, with the SCA being highest in the YD combination and the GCA being highest in the Rhode-C. Significant diferences in eg weight were observed among the combinations, with the egs from Rhode and Leghorn combinations being heavier than those from combinations with KNC-Y (P<0.01). In conclusion, the YC and YD combinations, characterized by excelent livabilty, are highly desirable paternal strains, while the CF and CK combinations, with excelent laying performance and moderate eg weight, are prefered maternal strains for Korean native chicken layer breeders.