• KOREAN POULTRY JOURNAL
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• v.44 no.9
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• pp.122-123
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• 2012

• KOREAN POULTRY JOURNAL
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• v.33 no.1 s.375
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• pp.115-119
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• 2001

백신 접종만으로 모든 질병을 완벽하게 제압할 수 없다는 것은 명백한 사실이지만, 사육밀도가 높고 발병 후 특별한 치료대책이 없는 바이러스성 질병이 대부분인 양계질병에 있어서는 질병의 농장유입을 막기 위한 각종 차단방역과 더불어 철저한 백신접종이 최선의 방책일 수 밖에 없다. 백신접종은 어떻게 얼마나 자주 실시하여야 하는가는 각 나라마다 그리고 각 농장마다 다를 수 있으나 국내의 상황과는 다르게 주요질병이 크게 문제가 되지 않는 미국에서의 백신접종 현황은 그 척도를 가늠해볼 수 있는 유용한 자료가 될 것이다. 다음에 분석된 자료는 미국의 육용종계와 실용산란계를 대상으로 백신 프로그램을 조사한 내용으로 1999년 미국내 전체 육용종계의 $91\%$(6,860만수), 산란계는 전체 산란계의 $\58\%$(1억1,000만수)에 대한 백신접종 현황을 반영한 것이다. 주요 백신에 대하여는 1997년과 비교하여 나타내었다.(본 자료는 미국 조지아대학교 수의과대학에서 발행하는 'The Poultry Informed Professional 2000년 3월호[Issue 35]에 개재된 내용을 참고하였다.)

• KOREAN POULTRY JOURNAL
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• v.37 no.4 s.426
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• pp.83-85
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• 2005

• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.107-108
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• 2004

산란계 육성기 제한시기 및 제한강도가 육성기 발육형태 및 산란생산성 반응을 구명하고자 1일령 갈색 산란 실용계 Isa-brown 1,000수를 공시하여 70주간 사양시험을 실시하였다. 사료급여 방법은 자유채식구와 제한급이구 9처리를 두었는데, 제한시기는 4, 6 및 8주령으로 하였고 제한강도는 각 시기별 70 %, 85 % 및 12주령 기준으로 70 %에서 85 %로 하는 처리를 두었다. 육성기 사료섭취량은 제한급이시기가 빠를수록 제한강도가 강할수록 자유채식구에 비하여 유의적으로 낮게 나타났다(P<0.05). 산란생산성은 4주령, 85 %구와 6주령 70 % 및 6주령 70 $\longrightarrow$ 85 % 전환구가 가장 우수한 것으로 나타났다. 계란 난각의 품질은 제한급이구가 산란후기에 자유채식구 대비 양호한 것으로 나타났다. 이상의 결과에서 육성기 제한급이는 육성기 사료섭취량을 절감할 수 있으며 생산성과 난각질 향상에 기여할 것으로 판단된다.

• Korean Journal of Poultry Science
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• v.50 no.4
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• pp.203-212
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• 2023

This study conducted a diallel-crossbreeding test using four Korean native chicken parent stock lines (YC, YD, CK, and CF) to develop a native commercial layer with high egg-laying performance. A total of 312 chickens in six combinations were examined for various traits, including livability, body weight, age at first egg-laying, hen-day, and hen-housed egg production, egg weight, and egg quality, from hatching to 60 weeks of age. The results showed that the average survival rate was 77.1±18.8% with the YDYC combination having the highest survival rate along with excellent specific combining ability. The YDYC combination exhibited significantly higher body weight compared to the other combinations (P<0.01). The average age at first egg-laying was 121.3±2.5 days, with no significant difference between the combinations. The average hen-day egg production was 74.0±6.4%, and the hen-housed egg production was 181.4±33.8 eggs with the YDCF and YCCK combinations demonstrating the highest laying performance, while the YDYC and CKCF combinations had the lowest (P<0.05). Laying performance was more influenced by specific combining ability than general combining ability. The eggs from the YDYC combination were significantly lighter and had the darkest shell color (P<0.01), whereas the YDCF combination exhibited the thickest eggshells. There was no difference in internal egg quality among combinations, except the YDCF combination had the darkest yolk color. Overall, we concluded that the YCCK combination, characterized by high laying performance and livability, and the YDCF combination with high laying performance and good egg quality are the most desirable combinations for Korean native commercial layers.

• KOREAN POULTRY JOURNAL
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• v.38 no.6 s.440
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• pp.175-180
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• 2006

닭 질병 방역 순회세미나 성료-차단방역의 중요성 부각/ 전국육계인대회-오는 6월 1~2일, 고성에서/ 검정소매각 및 이전지 선정위원회-검정소 이전문제 논의/ SBS 방송사 취재 요청 협조-이종길 전무 '결정 맛대맛' 인터뷰/ 채란분과위원회-산란실용계 DB사업 추진키로 결의/ 종계부화분과위원회-병아리 실명제 적극 참여키로/ 육계분과위원회-가금티푸스 집중논의/ 본회 직원 단합대회 개최/ 경기육계지부연합회-창립총회개최/ 제주도지회-기능성 닭고기 · 계란 개발/ 김포산란계지부-계란 홍보위해 계란찜기 보급

• Journal of Veterinary Clinics
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• v.20 no.2
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• pp.155-158
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• 2003

The purpose of this study was to investigate the prevalent characteristics of fowl typhoid (FT) of chicken caused by Salmonella gallinarum in Korea. The occurrence of FT for 7 years from 1995 to 2001 in Korea was analyzed. The incidence of FT outbreaks was 10.3% of the total outbreaks of avian infectious disease cases diagnosed at National Veterinary Research and Quarantine Service (NVRQS) from 1995 to 2001. When the outbreaks of H cases was analyzed in relation to the chicken breeds, the incidence of FT in commercial layers, commercial broilers, egg-type breeders, and meat-type breeders was 71.4%, 25.0%, 0.2% and 3.4%, respectively. Especially, the incidence in layers fell 25.8~27.6% in 2000 and 2001 from 1999, on the other hand, the amount of FT vaccines assayed at NVRQS for use in layers only jumped to 57,881.5$\times$1,000 dose in 2001, an increase of 4 times from the previous year. In the analysis of the seasonal distribution, it was found the incidence was high in summer (38.5%) and fall (33.9%). Also, the age comparison analysis showed that the rate of FT outbreaks in layers was highest (45.6%) between 10 to 30 weeks. However, in broilers, the highest percentage (61.6%) was shown at the age of below 2 weeks.

• Korean Journal of Poultry Science
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• v.15 no.2
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• pp.95-114
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• 1988

채란계의 생산성향상은 실용계의 유전적인 생산능력의 개량과 환경 및 사양관리 기술의 개선에 의하여 이루어 질 수 있는데 아무리 사양관리를 잘하여도 그 닭이 가지고 있는 유전적인 생산능력이 좋지 못할 경우 소기의 목적을 달성할 수 없으므로 채란계 산업의 성공적인 경영을 위해서는 생산성이 높은 우수한 계종을 선택하여야 한다. (중략)

• Korean Journal of Poultry Science
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• v.38 no.4
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• pp.331-338
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• 2011

The study was conducted to evaluate the production and the performance test of egg-type commercial Korean Native Chickens. A total of 360 female layers were produced from CY${\times}$C (A), CL${\times}$C (B), CG${\times}$C (C) and CW${\times}$C (D) crossbreds kept at National Institute of Animal Science, Korea, and breed during 20~64 weeks to investigate the productivity and the performance. Layers were divided into 4 crossbreds (6 replications/crossbred, 15 heads/replication). Age and egg weight at first egg was no significantly different among crossbreds. Body weight (BW) at first egg of D crossbred was significantly lower compared to that of other crossbreds (P<0.05). Weekly BW of B crossbred was the highest at 20, 30 and 40 weeks of age, but BW of D crossbred was the lowest among crossbreds. Feed intake (FI) of B crossbred was significantly higher compared to the other crossbreds at 20~24, 32~44 and 52~60 weeks of age. FI of D crossbred was significantly lower compared to other crossbreds after the age of 44 weeks (P<0.05). Average egg weight of B crossbred was significantly higher than the other crossbreds at the age of 24~60 weeks (P<0.05). Egg production ratio (%) of C crossbred was significantly higher compared to the other crossbreds for whole test periods (P<0.05). Hen-housed egg production number at 64 weeks of age for A, B, C and D crossbreds resulted in 241.4, 235.6, 232.3 and 227.0, respectively. Feed conversion ratio of A and C crossbreds was lower compared to the other crossbreds at the age of 20~24 weeks and C crossbred was the lowest among the crossbreds at the age of 60~64 weeks. These results provide the basic data which will be helpful to develope the new strains of commercial Korean Native Chickens.

• Korean Journal of Poultry Science
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• v.43 no.4
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• pp.253-261
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• 2016

Egg quality is a very important factor for both consumers and producers. Factors affecting egg quality include strain and age of hens; egg storage temperature, time, and humidity; laying season; and feeding. This study aimed to determine the effect of hen age and egg storage time on egg quality. A total of 700 eggs obtained from Hyline Brown commercial layers were used for this experiment, and they were separated into two hen age groups (30 vs. 60 weeks) with eight treatments and four storage times (day 0, 10, 20, and 30). The egg weight; shell color, thickness, and density; albumen height; Haugh unit (HU); yolk color; and the yolk and albumen pH and viscosity were measured for the egg quality assessment. The results showed that the age of the hen and egg storage time significantly affected almost all parameters of the internal and external egg quality. The shell thickness, albumen height, HU, yolk color, pH of yolk and albumen, and yolk viscosity significantly decreased with increasing hen age. The egg shell color was significantly lighter in eggs from 60-week-old hens than in those from 30 weeks-old hens. The egg weight; shell weight, thickness, and density; albumen height, HU; and albumen viscosity significantly decreased, but the yolk color and pH of the yolk and albumen increased with increasing egg storage time. The interaction effects between the storage time and hen age were significant in shell thickness, albumen height, yolk color, and yolk and albumen pH and viscosity. The eggs obtained from 60-week-old hens showed significantly lower shell thickness, albumen height, and HU values, which are considered typical egg quality measurements, than values of eggs from 30-week-old hens. Therefore, increasing hen age and egg storage time caused the deterioration of egg quality. In conclusion, this study demonstrated that hen age is the major factor affecting the quality of fresh eggs, whereas the storage time is the determinant factor affecting the quality of stored eggs.