• 한국축산식품학회지
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• 제34권4호
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• pp.448-456
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• 2014

Studies on the flavour characteristics of meat-based broth, quantification of flavour-related and functional compounds, and factors affecting the availability of such compounds are minimal. The present study was designed to determine the effects of sex on flavor-related and functional compounds in freeze-dried broth (FDB) made from Korean native chickens (KNC). Male and female KNC from a commercial strain (Woorimatdag$^{TM}$) were reared under similar commercial conditions. FDB was separately prepared using male and female birds aged 100 d (six birds of each sex) and analyzed for nucleotide, free amino acid, betaine, carnitine, carnosine, anserine, and creatine contents, and fatty acid composition. The levels of betaine, carnitine and creatine in FDB were not significantly different between the two sexes (p>0.05) in KNC. Carnosine and anserine were not detected in FDB samples. However, FDB from female chickens had significantly higher inosine-5-monophosphate and arachidonic acid contents than did FDB from male chickens. FDB prepared with male KNC contained higher levels of inosine, linoleic acid, glycine, alanine, lysine, and serine (p<0.05). However, glutamic acid, oleic acid, and DHA were present in comparable amounts (p>0.05) in FDB made from male and female KNC. Our findings suggest that the sex of KNC has significant effect on the contents of flavor-related compounds, but not functional compounds.

• Asian-Australasian Journal of Animal Sciences
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• 제33권1호
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• pp.139-147
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• 2020

Objective: The aim of this study was to compare the quality characteristics of retorted Samgyetang (Korean ginseng chicken soup) made from white semi-broilers (WSB; Ross×Hyline white, 3 weeks old), commercial broilers (CB; Ross, 4 weeks old), Korean native chickens (KNC; Hanhyup-3-ho, 12 weeks old) and old laying hens (OLH; Hyline white, 72 weeks old) and to explore the possibility of using the carcasses of KNCs and OLHs as raw material for product diversification. Methods: Raw and cooked meat quality, fatty acid composition and consumer acceptance were analyzed. Results: Among the chicken breeds, OLH and KNC showed a higher shear force value than WSB and CB due to high insoluble collagen contents. However, the meat of KNC was more tender than that of OLH. The meat of OLH was characterized by the lowest moisture content and highest crude fat content. The meat of KNC was characterized by a higher proportion of saturated fatty acids, α-linolenic acid and arachidonic acid than that of OLH. The meat of OLH showed the highest content of unsaturated fatty acid, particularly linoleic acid, in its thigh meat. Electronic nose readings revealed that the meat aroma pattern was clearly different across breeds. OLH had the lowest overall acceptance score, while no differences were found in flavor, texture, juiciness and appearance among WSB, CB, and KNC. Conclusion: KNC shows potential as raw material for Samgyetang, while additional preprocessing methods, such as tenderization and fat removal, are required for the utilization of OLH as raw material for retorted Samgyetang.

• 한국가금학회지
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• 제45권2호
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• pp.125-135
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• 2018

상용 토종닭과 신품종 교배조합 토종닭 3종을 같은 조건 아래 12주령까지 사육한 후 생산성을 비교하여 신품종 종계의 시장출시 가능성을 확인하였다. 또한 상용 토종닭, 신품종 교배조합 토종닭 3종을 시판되는 브로일러와 육질특성을 비교하였다. 생산성에서 신품종 교배조합 토종닭 2C가 기존의 상용토종닭과 비교하여 수컷에서는 생산성이 뛰어났고, 암컷에서는 차이를 보이지 않았으며, 균일도는 비슷하게 나타났다. 또한 사료요구율 및 폐사율이 낮게 나타나 전반적으로 우수하였다. 정강이의 길이는 신품종 교배조합 토종닭 2C가 가장 길었으나, 생체중과 정강이 길이의 비율로 환산하면 가장 낮게 나타났다. 계육의 일반성분에서는 상용토종닭 및 신품종 교배조합 토종닭 간 차이를 나타내지 않았으나, 브로일러와 비교할 때 가슴육에서 수분이 높고, 다리육에서 조단백질 함량이 높았다. 또한 pH는 브로일러, 상용토종닭, 신품종 교배조합 토종닭 2C, 2D, 2A의 순으로 나타났다. 가슴육 내 핵산관련물질은 브로일러가 신품종 교배조합 토종닭에 비해 가슴육 내 AMP, inosine, hypoxanthine이 높았고 IMP는 낮았다. 교배조합 간에서는 IMP 함량이 상용토종닭, 2A, 2C, 2D 순으로 높음을 보였다. 다리육의 핵산물질 함량도 신품종 교배조합 토종닭 2A 및 2C, 상용 토종닭, 2D의 순서로 IMP가 높게 나타났다. 가슴육의 지방산 조성은 상용토종닭과 신품종 교배조합 토종닭이 브로일러에 비해 아라키돈산(C20:4)과 다가불포화지방산(PUFA)이 높게 나타났으며, 올레인산(C18:1)과 불포화지방산 조성이 낮게 나타났다. 관능평가 결과, 신품종 교배조합 토종닭 2C는 전체적으로 더 고소하고 쫄깃하며 기호도 평가 또한 뛰어났으며, 가슴육은 비린내가 덜 하고, 다리육은 기호도 평가에서 신품종 교배조합 토종닭뿐 아니라, 상용토종닭과 브로일러보다도 우수하여 신품종 교배조합 토종닭 2C의 시장 가능성을 확인하였다.

• 한국유기농업학회지
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• 제13권1호
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• pp.113-122
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• 2005

for 50% of Rash water every week during experimental period. Eight of 100L of aquarium, eight kg of mudfish and four of female korean native chicken were used this study. This study are divided according to the mudfish fed on commercial mudfish diet in the four of control group and fed on raw hens excreta in the four treatment group. The chemical composition was compared with commercial mudfish diet and hens excreta. In the both sample, crude protein contents was almost same. The crude fat and crude ash were higher in hens excreta than commercial mudfish diet. The growth performance of mudfish tend to high when fed hens excreta. There were no differences in contents of E. Coli and Salmonella and pH of water in aquariums between the groups. Mortality of mudfish tend to decrease when fed hens excreta. No problem with mudfish health was observed during the experimental period of 35 days. These results indicated that it is possible to raising mudfish fed on hens excreta only.

• 농업과학연구
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• 제48권1호
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• pp.171-178
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• 2021

A comparative study was conducted to examine the effects of mixed and separate gender feeding on growth performance of Korean native chickens (KNC) against a white semi-broiler (WSB) and a commercial broiler (CB) over five weeks. 576 chicks were used with eight birds per cage in a randomized complete block design with 18 replicates per breed. For the KNC lines, three groups of male (M), female (F) and mixed-gender (FM) were used. Fresh water and feed were supplied on an ad-libitum basis. Birds were fed a standard starter (d 1 - 22) and grower diet (d 23 - 35). Body weight (BW), feed intake, and shank length (SL) were measured weekly. From the BW and feed consumed data, the average daily feed intake (ADFI), average daily gain (ADG), and feed conversion ratio (FCR) were calculated. The commercial broiler showed higher performance (p < 0.05) for all the indices measured for the entire period. The CB group consumed more feed and were more feed-efficient thus grew faster. This group was followed by the white semi-broiler and the KNC, in order. An intra-breed comparison for KNCs revealed that the males showed better growth performance with longer SL (p < 0.05) compared to the female and mixed-gender groups. The results showed that other than the breed type, mixed and separate gender feeding impacted on the growth performance of the two lines of Korean native chickens. Males for both lines of KNC generally performed better for the parameters measured, as determined by a greater BW and reduced FCR.

• 한국가금학회지
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• 제41권3호
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• pp.151-157
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• 2014

한국 재래닭은 한국 고유의 유전자원으로써 깃털 색에 따라 회갈색, 흑색, 적갈색, 백색, 황갈색의 다섯 계통으로 분류되어 있다. 이들은 일반 육계와 다른 독특한 육질과 풍미를 가지는 것으로 보고되고 있으며, 특히 닭고기의 풍미를 높이는 것으로 알려진 아라키돈산의 함량이 풍부한 것으로 알려져 있다. 따라서 본 연구는 한국 재래닭 5계통에서 아라키돈산의 함량과 그 전구 물질인 리놀레산의 함량을 조사하고자 실시하였다. 본 연구에는 총 597마리의 $F_1$ 개체를 이용하였으며, 각 개체의 다리육과 가슴육에서 아라키돈산과 리놀레산의 함량에 대하여 조사하고, 계통 간의 유의성 검정, 유전력과 유전모수 추정을 실시하였다. 본 연구의 결과, 한국 재래닭 5계통 간의 아라키돈산 함량은 유의적인 차이가 있음을 확인하였다. 또한 아라키돈산의 유전력은 다리육과 가슴육에서 모두 중도 이상의 높은 유전력(0.414~0.570)을 나타냈으며, 아라키돈산과 리놀레산의 유전 상관계수는 부의 상관관계를 확인할 수 있었다. 따라서 본 연구의 결과는 한국 재래닭 5계통을 이용하여 풍미 특성을 향상시킬 수 있는 아라키돈산 형질에 대한 선발과 실용 재래닭 개량을 위한 육종계획에 활용될 수 있을 것으로 사료된다.

• 한국식품저장유통학회지
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• 제19권3호
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• pp.385-392
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• 2012

일반 육계와 토종닭의 정미인자를 비교 분석하기 위하여 시장 출하 시기인 체중 2 kg 내외의 일반 육계(5주)와 토종닭(13주)을 각각 도계한 후 가슴육, 다리육의 정미성분인 지방산, 유리아미노산 및 휘발성 향기 성분을 분석하였다. 가슴육 및 다리육에서 일반 육계와 토종닭간의 주요 지방산은 큰 차이가 없었으나 토종닭에서 다가불포화지방산인 arachidonic acid 및 docosahexaenoic acid의 함량이 일반 육계에 비하여 높은 것으로 나타났다. 가슴육에서의 아미노산 조성은 풍미성분들인 aspartic acid, threonine, serine, glycine, alanine, tyrosine, lysine, histidine, arginine의 함량이 일반 육계에 비하여 토종닭에서 유의적으로 높았으나 다리육에서는 일반 육계와 토종닭 간에 유의적인 차이가 없었다. 휘발성 향기 성분을 측정한 결과, 가열에 의하여 토종닭이 일반 육계보다 고기의 풍미에 영향을 미치는 향기 성분의 양이 증가한 것으로 확인되었다.

• 농업과학연구
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• 제46권4호
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• pp.991-997
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• 2019

This study was conducted to investigate the laying period performance of two crossbred Korean native chicken (KNC) grand parent stock (GPS) layer during 20 to 40 weeks. A total of 351 20-week-old KNC GPS were allocated in a completely randomized design to give 4 birds per each cage. The chickens were fed commercial diets [i.e., week 20 - 32, crude protein (CP) 18.0% and metabolizable energy (ME) 2,850 kcal/kg; week 32 - 40, CP 17.0% and ME 2,800 kcal/kg)] and fresh water during the whole experiment period ad libitum basis. Body weight, age of sexual maturity, egg weight, hen-day egg production (HDP) and feed conversion ratio (FCR) were measured during the experiment period (week 20 - 40). The results show no significant difference in the Body weight, age of sexual maturity, egg weight, and hen-day egg production (HDP) except for egg weight. 1B had a higher egg weight on week 36 only. We expect that the reason why most factors showed no significant difference is the lack of nutrients caused by limited feeding which follows the standard feeding system for the grand-parent stock. These results provide basic information for laying data in 2-way crossbred Korean native chickens.

• 한국축산식품학회지
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• 제22권2호
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• pp.122-129
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• 2002

본 연구는 경상북도 축산기술연구소에서 보유하고 있는 재래닭 160수를 공시하여 인삼 부산물(잎 줄기), 산약 부산물(박피후 건조껍질), 한약(달인 후 찌꺼기) 부산물을 각각 5%씩 기본사료에 첨가급여하였다. 시험기간은 부화후 8주령에 시작하여 20주령에 종료하였으며, 재래종 계육의 육질에 미치는 영향을 알아보기 위해 이화학적 특성을 조사하였다.

• Journal of Animal Science and Technology
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• 제65권5호
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• pp.912-921
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• 2023

Genetic diversity analysis is crucial for maintaining and managing genetic resources. Several studies have examined the genetic diversity of Korean domestic chicken (KDC) populations using microsatellite markers, but it is difficult to capture the characteristics of the whole genome in this manner. Hence, this study analyzed the genetic diversity of several KDC populations using high-density single nucleotide polymorphism (SNP) genotype data. We examined 935 birds from 21 KDC populations, including indigenous and adapted Korean native chicken (KNC), Hyunin and Jeju KDC, and Hanhyup commercial KDC populations. A total of 212,420 SNPs of 21 KDC populations were used for calculating genetic distances and fixation index, and for ADMIXTURE analysis. As a result of the analysis, the indigenous KNC groups were genetically closer and more fixed than the other groups. Furthermore, Hyunin and Jeju KDC were similar to the indigenous KNC. In comparison, adapted KNC and Hanhyup KDC populations derived from the same original species were genetically close to each other, but had different genetic structures from the others. In conclusion, this study suggests that continuous evaluation and management are required to prevent a loss of genetic diversity in each group. Basic genetic information is provided that can be used to improve breeds quickly by utilizing the various characteristics of native chickens.