• Title/Summary/Keyword: 종계

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Pathological Findings of Necrotizing Skeletal Myopathy in Layer Breeder Chickens (산란 종계 골격근의 괴사성 근증에 대한 병리학적 소견)

  • 권용국
    • Korean Journal of Poultry Science
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    • v.30 no.1
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    • pp.55-59
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    • 2003

  • A necrotizing skeletal myopathy was diagnosed in three flocks of 30,000 thirty-eight-week-old layer breeder chickens. The mortality attributed to the myopathy was 17.7%, 12.3% and 21.1% in flock A, B and C, respectively. Clinically, chickens were showed depression, anorexia, posterior paresis, inability to rise, incoordination, reluctance to move, and leg trembling and weakness. The most striking findings at necropsy was pale streaking in the muscles of the thighs and legs. Microscopic lesions included myofiber degeneration and necrosis with massive cellular proliferation interpreted as sarcolemmal nuclei proliferation. Plasma creatine kinase, asparte aminotransferase and akaline phosphatase were markedly elevated. In conclusion, author suggested that submitted chickens were affected by ionophores poisoning.

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Production of Feather-Sexing Korean Native Commercial Chickens (깃털 성감별 상업용 토종 실용닭 생산)

  • Sea Hwan Sohn;Eun Jung Cho;Seul Gy Lee;Junho Lee;Suyong Jang;Kwijoong Yong
    • Korean Journal of Poultry Science
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    • v.51 no.2
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    • pp.65-71
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    • 2024

  • The feather-sexing method is widely used commercially for chick sex identification. However, for feather-sexing to be industrially practical, the early-feathering (EF) and late-feathering (LF) genes must existed within the foundation stock, a suitable feather-sexing lines must be established, and the accuracy of sex identification by feather-sexing must be ensured. Therefore, this study introduces the method of constructing the Korean native chickens (KNC) feather-sexing lines using EF and LF genes and evaluates the effectiveness of feather sex determination on commercial chicks produced from the constructed KNC lines. The results showed that both EF and LF chickens existed within the foundation stock, with the frequency of LF genes ranging from 0 to 0.205. In feather-sexing line establishment, the paternal strain of the grandparent stock (GPS) was fixed as EF (kk) for both sexes, while the maternal strain was composed of males with LF homozygotes (ZKZK) and females with EF (ZkW). Thus, in the parent stock (PS), male breeder had EF (ZkZk) and female breeder had LF (ZKW), resulting in chicks produced from their crosses having LF (ZKZk) for males and EF (ZkW) for females, allowing sex determination based on feather development. Additionally, to evaluate the effectiveness of feather-sexing for the produced commercial chicks, a study was conducted on 1,000 samples of the produced chicks to investigate the concordance between vent-sexing and feather-sexing, showing a matching rate of 93.1%.

  • https://doi.org/10.5536/KJPS.2024.51.2.65 인용 PDF HTML

육용종계의 육성관리(II)

  • 이병호
    • KOREAN POULTRY JOURNAL
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    • v.14 s.158
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    • pp.53-57
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    • 1982

  • 우수한 종계 특유의 능력을 갖춘 닭이라도 중대추 육성시 체중조절을 위한 사양관리 여하에 따라 그 능력이 크게 좌우된다.

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