• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.97-98
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• 2004

The observed means and standard divisions of the major laying traits per generation in korean native chickens were as follow. The age at first egg, the egg weight at the first egg, the weight at 270days and the egg production to 270days were 147.1$\pm$1.9 days. 32.3$\pm$0.9 g, 49.4$\pm$0.7 g and 76.2$\pm$1.7 eggs. The regression coefficients were -0.75$\pm$0.01 days, 0.33$\pm$0.08 g, 0.19$\pm$0.05 g and 0.47$\pm$0.3 eggs respectively.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.99-100
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• 2004

The observed means and standard divisions of the egg shape per generation in korean native chickens were as follow. The egg major axis, the egg miner axis and the egg shape index were 53.0$\pm$0.6～55.6$\pm$0.8 mm, 39.1$\pm$0.8～40.9$\pm$0.2 mm and 72.7$\pm$1.5～75.9$\pm$0.5 mm. The regression coefficients were -0.02～0.20 mm, 0.10～0.52 mm and 0.19～1.00 mm respectively.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2004.11a
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• pp.101-102
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• 2004

The observed means and standard divisions of the egg texture per generation in korean native chickens were as follow. The egg shell strength, the egg shell thickness and the egg shell colour were 3.8$\pm$0.2~4.2$\pm$0.1 kg/$\textrm{cm}^2$, 356.4$\pm$4.9~368.8$\pm$6.5${\mu}{\textrm}{m}$ and 47.0$\pm$1.7~50.0$\pm$3.3％. The regression coefficients were -0.03~0.03 kg/$\textrm{cm}^2$, -0.84~4.40${\mu}{\textrm}{m}$ and -0.88~-0.36％ respectively.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.115-116
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• 2003

The significant strain effects were investigated In all the major economic traits in Korean native chicken. The highest Least Square(LS) means of the body weights at 150 and 270days of age were observed in Black strain as 1, 594.38 and 1, 911.57 g. The earliest LS mean of the ages at first egg was 146.88 days in White strain. The heaviest LS means of egg weights at the first egg and 270 days of age were observed in Red brown strain as 33.20 and 50.74 9. The LS mean of the largest number of egg production was 79.50 eggs in Yellow strain.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.67-68
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• 2003

한국 재래 닭의 유전적 특성 규명 및 기능 유전체 연구의 기초재료를 확보하고자 대량 EST 염기서열 결정 및 생물정보학 분석을 실시하였다. 대량 EST 염기서열 분석을 위한 첫 번째 단계로 재래 닭의 뇌, 비장, 정소, 배아 생식기를 이용하여 cDNA library를 구축하였다. 각각의 library로부터 총 15,121개의 클론을 선정하여 염기서열을 결정하였다. 생물정보학 분석결과 15,121개의 염기서열은 총 10,353개의 contig로 정리되었다. 이들 염기서열을 기존 데이터베이스를 대상으로 tBlastX(http://www.ncbi.nlm.nih.gov/BLAST) 분석을 실시한 결과, 염기서열 중 56 ％가 기존 데이터베이스에 존재하는 유전자와의 상동성을 보였다. 상동성을 보이는 유전자들은 유전자의 구조 및 기능 분석에 이용될 것이고, 상동성을 보이지 않는 유전자들은 microarray와 같은 대량 유전자 발현분석 시스템을 이용하여 선별한 후 기능분석이 실시될 것이다.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.127-128
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• 2003

This study was conducted to obtain for genetic information with 11, 538 progenies of 5 strains in Korean native chicken. The heritability estimates of the body weights at 150 and 270days of age were 0.25~0.61 and 0.32~0.59 in 5 strains, the heritabilities of the body weight at 270 days were relatively higher than that of the body weight at 150 days. The medium or low heritability estimates were observed in the ages at first egg as 0.15 ~0.31, and heritability estimates of the egg weights at the first egg and 270 days of age were 0.06~0.09 and 0.24~0.41. Medium or low heritability estimates were observed for the number of egg production as 0.09 ~0.26, respectively.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.125-126
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• 2003

The observed genetic gains per generation in Korean native chicken on the basis of the 7 generation data collected from 11,583 birds from 1995 to 2001 at National Livestock Research Institute, Korea. Results obtained were summarized as follows : The body weight at 150 days, -5.292 ∼ 3.682 g ； for the body weight at 270 days, -6.184 ∼ 4.591 g ； for the age at first egg, -0.399 ∼ -0.102 ； for the egg weight at the first egg, -0.026 ∼ 0.016 ； for the e99 weight at 270 days, -0.039 ∼ 0.068 g ； for the egg production at 270 days, 0.222 ∼ 0.587, respectively.

• Korean Journal of Poultry Science
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• v.41 no.1
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• pp.7-14
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• 2014

Tyrosinase (TYR) gene is located on chromosome 1 in chicken and it is composed of five exons and four introns. TYR gene is described as a key enzyme in melanin biosynthesis. Most examples of complete albinism in chicken have been due to defects in the tyrosinase gene. The association of feather color and sequence polymorphism in the Tyrosinase (TYR) gene was investigated using Korean Native chicken H breed (H_PL), Korean Native chicken L/W breed(L/W_PL) and 'Woorimatdag' commercial chickens (Woorimatdag_CC). From L_PL and W_PL breed analyses, 4 synonymous SNPs (locus G33A, G116A, C217T and C247T) and 2 SNPs (G838A and G958A) were detected in 4th exon and 4th intron of TYR gene respectively. The genotype frequencies for 6 SNPs were compared between L_PL and W_PL and W_PL represented homozygous SNP types in all the analyzed SNP positions while L_PL displayed various SNP types.

• Korean Journal of Poultry Science
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• v.33 no.3
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• pp.181-188
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• 2006

Changes in the fine structure of testicular Leydig cell from hatching to adulthood were studied in Korean native chickens of 1, 2, 4, 6, 8, 10, 12, 14, 16, 18, 21, 24, 28, 32, 44, 52 and 64 weeks (n=13 chickens per group) of age. The objective of this study were to elucidate Leydig cell ultrastructure during testicular development. Testes of chickens were fixed by whole body perfusion using a fixative containing 2.5% glutaraldehyde in cacodylate buffer, processed and embedded in Epon-araldite. Using $1{\mu}m$ sections stained with methylene blue-azure II, qualitative and quantitative(stereological) morphological studies were performed. The ultrastructural changes of the Leydig cell were investigated by ultrathin section with the transmission electron microscope. The stages of the Leydig cell development described focus on mitochondria, endoplasmic reticulum, and lipid droplets which are involved in androgens as fullows. 1) Approaching puberty. The closely packed Leydig cells and sparse intercellular space. The nucleus occupied a large portion of the Leydig cell volume. The population of Leydig cells contained two types of cells that differed in the appearance of their nuclei which were either highly electron-opaque or relatively electron-lucid. The cytoplasm was characterized by large amounts of lipid droplets, relatively few spherical mitochondria, and sparse smooth endoplasmic reticulum. 2) Puberty to adult. The Leydig cells which display features compatible with significant androgen synthesis: large volume of cytoplasm containing extended smooth endoplasmic reticulum, abundant mitochondria, and reduction of lipid droplets.

• Korean Journal of Poultry Science
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• v.35 no.4
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• pp.335-339
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• 2009

The very low density apolipoprotein-II (apoVLDL-II) gene is closely related with the constitution of the lipoprotein in various tissues. The apoVLDL-II gene have main functions for reducing fat elements from tissues and muscles. Previous results indicated that the polymorphisms in apoVLDL-II gene were positively related with growth and body composition traits in chicken. In this study, we analyzed previously identified apoVLDL-II gene polymorphisms using the PCR-RFLP method and investigated allele and genotype frequencies in three chicken breeds. Data indicated that Korean native chicken and Korean Oge chicken have similar B and F gene frequencies, indicating that this marker can be used for the improvement of growth and body composition traits in those breeds and can be used as marker assisted selection with further verifications.