• 한국가금학회지
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• 제39권2호
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• pp.105-112
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• 2012

Genetic resource conservation of indigenous species is important to conserve terrestrial, aquatic and avian species throughout the world. The native Korean Oge (KO) chickens are important and protected indigenous avian species in Korea. This KO breed is very popular in Korea because of its external appearances of blackish color. The characterization of morphology and growth performances of KO were performed since 1980s, however the information is still not sufficient for breed selection. In this study, we compared various growth performances including body growth, tibia length, shank length, chest width, chest grith and length of tail feather between male and female chickens of KO and widely known White Leghorn (WL) breeds at 1 week, 2 weeks, 5 weeks, 10 weeks, and 24 weeks. We observed differences on various growth performances at different aged groups between KO and WL chickens. This study may help for the selection of chicken breeds based on age, body growth and meat production.

• 한국가금학회지
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• 제41권2호
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• pp.87-92
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• 2014

The avian embryos have been used as a good model to study embryonic development. Due to its unique development in the eggshell, avian embryos can be cultured and hatch in the surrogate eggshell system. In this study, we examined the viability, normal development and hatchability of Korean Oge (KO) chicken embryos in White Leghorn (WL) surrogate eggshells. Donor KO embryos at 3-day and 4-day-old were transferred into recipient WL eggshells, incubated for further 18 days at $37.5^{\circ}C$ with 70% of humidity until hatching. The viability of 3-day-old KO embryos at 7, 14 and 21 day in surrogate eggshell were 70.0%, 43.8% and 23.1%, respectively. In contrast, the viability of 4-day-old KO embryos at 7, 14 and 21 day in surrogate eggshells were 87.1%, 55.6% and 36.0%, respectively. The hatchability of KO embryos transferred into surrogate eggshells at 3-day-old was 23.1%, whereas embryos transferred at 4-day-old was 36.0%. Furthermore, the development of all viable embryos from 3-day group and 4-day group were normal. Our results suggested that culture of KO embryos in WL surrogate eggshells is highly possible, and transfer of donor embryos at 4-day-old may yield higher percentage of hatchability. This study may provide potential knowledge for the conservation of wild and endangered birds through surrogate system.

• 한국인구학
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• 제13권1호
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• pp.3-25
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• 1990

Life table of Korean population for years 1983 1985 1987 and 1989 were constructed byt the National Bureau of Statics. The ago specific death rates were calculated froom the death registral ion for numerators and the estimated population by age and sex for denominators. In the course of constructing life tables, we have maole some adjustments for deficiencies in regist rat ion olata as follows. First, the non-registered portion oof infant deaths especially for neo-natal deaths was estirnateol and added too the original data. The main reason is that deaths occorring in the neo-natal period and prior to the registrat ion of birth leave little incentive for the registration of either the birth or the death. Second. t he do~hayed p(ortioon of deaths registering after one year of occurrence was estimated and added too the original data. Third t the ptortioon haying in, occuracies in ,~oge reporting was also estimated. Fourth the moving average methood was finally employed in an effort too remove the random error. The major fin(hings are as foolloows. 1. the average life expectancy at birth in 1989 is calculateol as 70.8 years in 1989, 2. a gap netween the male and female life expectancies is widened to more than 8 years toorm 1.8 years in 1906 10. It means that the female life expectancy has increased substantially, 3. the death rates of the middle - aged men starting age 40 are found to he relatively higher than those of females and younger age groups. This peculiar pattern was also found with the comparison of those of other countries.

• 한국가금학회지
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• 제35권4호
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• pp.335-339
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• 2009

초저밀도 아포지단백(Very Low Density Apolipoprotein-II)은 조직의 지방단백질 분비 조성과 밀접한 관련이 있다고 알려진 유전자로서 최근 닭에서 성장 및 체구성과 매우 높은 연관이 있다고 알려져 있다. 본 연구는 닭의 3품종에서 PCR-RFLP 방법을 통해 apoVLDL-II 유전자의 유전자형을 분석하고 Broiler 형(B)과 Fayoumi 형(F)을 결정하였다. 각 품종간 유전자형 빈도는 한국 재래계에서 BB가 0.37, BF가 0.43, FF가 0.2로 검출되었고, 오계에서 BB가 0.2, BF가 0.6, FF가 0.2로 검출되었으며, 백색레그혼에서 BB가 0.16, BF가 0.84로 검출되었다. Broiler 형은 성장이나 체구성을 높이는 방향으로 작용한다는 기존의 보고를 바탕으로 본 연구에서 나타난 집단내 다양한 유전자형 분포는 재검증 작업을 거쳐 육종에 의해 이 형질들을 개량할 수 있음을 의미한다.

• 한국가금학회지
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• 제40권3호
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• pp.207-216
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• 2013

동결 닭 원시생식세포의 생식계열 키메라를 이용한 생체에의 복원을 실용화하기 위해서는, 닭 원시생식세포의 동결보존기술의 향상에 의해 동결 및 융해 후의 많은 생존세포를 확보하는 것과, 생식계열 키메라의 제작효율을 높이는 것이 반드시 필요하다. 닭 원시생식세포는 배양 5.5~6 일령의 닭 원시생식선으로부터 채취하고, MACS 방법에 의해서 순수 닭 원시생식세포를 분리했다. 15% 각각의 EG와 DMSO를 동결보호제로 사용한 처리군이 각 군의 농도에 상관없이 유의적(p<0.05)으로 glycerol 처리군보다 동결 및 융해 후의 세포의 생존율이 높음을 확인하였다. 특히 10% EG + FBS 조합의 처리군에서 상업용 닭(C : $89.4{\pm}0.2%$)과 이사브라운 (A : $87.4{\pm}0.4%$)의 두 품종이 오계(B : $77.6{\pm}1.1%$) 및 화이트레그혼(D : $76.2{\pm}0.9%$의 두 품종보다 동결 및 융해 후의 원시생식세포의 생존율이 유의적(p<0.05)으로 높음을 확인하였다. 이상의 결과들로부터10% EG + FBS와10% DMSO + FBS 조합의 두 처리구 간에 동결 및 융해 후의 세포생존율의 유의적인 차이는 보이지 않았지만, 동결 배지의 농도별 효율이 높음을 확인했다. 또한 네 품종 간의 동결 및 융해 후의 닭 원시생식세포 생존효율의 비교에서는 상업용 닭, 이사브라운, 오계 그리고 화이트레그혼 품종 순으로 생존율이 높음을 확인하였다. 초자화 동결에 있어서 가장 높은 생존율을 보인 10% EG이 10% DMSO와 함께 최적의 동결보호제로서 사용 가능성을 확인하였다.