• 농업과학연구
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• 제46권2호
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• pp.351-359
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• 2019

The purpose of this study was to compare the growth performance, nutrient digestibility, fecal microflora, blood profiles and meat quality of broilers, Korean native chickens and white semi broilers under identical feeding conditions. Sixty 1-d chicks of each type were randomly placed into 12 pens per cage (5 chicks per cage) and fed commercial diets for 28, 49, and 28 days, respectively. The broilers showed a significantly higher (p < 0.05) growth performance from 0 to 4 weeks compared with the other types. Korean native chickens had a significantly higher (p < 0.05) digestibility of dry matter and nitrogen than that of the other species. The blood glucose was significantly higher in the Korean native chickens compared to the other species, and the blood cholesterol was significantly lower. The Lactobacillus content in Korean native chickens was significantly higher (p < 0.05) compared to the other species, and the E. coli content in the broilers was significantly higher (p < 0.05) than in the Korean native chickens and white semi broilers. In terms of meat quality, the breast meat of the broilers had a high water content and pH level. The breast meat of the white semi broilers had a significantly lower (p < 0.05) shear force than that of the other species. In conclusion, there was an interspecific physiological difference due to the age and body weight of the chickens. The broilers had a higher growth performance and meat quality compared to the Korean native chickens and white semi broilers.

• 한국축산식품학회지
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• 제41권5호
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• pp.788-801
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• 2021

This study examined biochemical components, fatty acids, antioxidant dipeptides, and muscle fiber density of breast and thigh muscles from Korean new native chicken strains (A and B) at two slaughter ages, compared with white semi-broiler (W) or broilers. The pH values were different by chicken breed. The new native strains had the lowest fat content in the breast at 12 wk (p<0.05). Regardless of the muscles, A and B at 12 wk had higher levels of arachidonic acid (ARA; C20:4), docosahexaenoic acid (DHA; C22:6), and nervonic acid (C24:1) than broilers (p<0.05). A similar result was observed for the polyunsaturated fatty acids (PUFAs) and polyunsaturated and saturated fatty acids ratio (P/S) content in the breast. Irrespective of the muscles, A and B enriched with omega-3 fatty acids had a lower ω-6/ω-3 PUFA ratio than broilers (p<0.05) at 12 wk. Of the antioxidant di-peptides, the anserine contents were highest in A and B than in the W or broilers (p<0.05), regardless of the muscles and slaughter ages. Furthermore, the breast meat from A and B contained a higher muscle fiber density for both slaughter ages than the W and broilers (p<0.05). Based on these findings, even if the commercial birds (broilers or W) are raised under the similar environmental conditions as A and B, the new native chicken strains have distinct meat quality attributes, particularly higher ARA and DHA levels, lower ω-6/ω-3 PUFA ratio, and higher anserine contents.

• 한국동물위생학회지
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• 제35권2호
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• pp.91-97
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• 2012

The strategy for infectious bursal disease (IBD) control and its success rate under field conditions depends on hygiene management, IBD field pressure, level, and variation in maternally derived IBD antibodies. This study investigated the level of IBD-specific antibody by ELISA and the prevalence of IBD virus by PCR in broilers, white-semi broilers, and Korean native chickens raised in Jeongeup, Jeonbuk. IBD-specific maternally derived antibodies were measured from 698 chickens and the mean titers of maternal antibodies were $3,572{\pm}1,402$ in broilers, $1,262{\pm}762$ in white-semi broilers, and $1,932{\pm}912$ in Korean native chickens. At 2 weeks after vaccination, the geometric mean antibody titers of broiler, white-semi broiler, and Korean native chicken were $582{\pm}427$, $3255{\pm}1,080$, and $1,023{\pm}499$, respectively. According to sequence analysis of the variable virion protein 2 gene, 4 isolates were found to be very virulent IBDV, 9 isolates classical virulent, and 2 isolates intermediate plus vaccine strain.

• 한국축산식품학회지
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• 제41권2호
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• pp.237-246
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• 2021

The taste-active and nutritional components of Thai native, broilers, black-boned, and spent hen chickens were analyzed. The amounts of tasty amino acids especially glutamic acid were the highest in Thai native chicken. The black-boned chicken had the highest arginine content, related to the least amount of consumer satisfaction. Concerning nutritional quality, choline, and taurine were deemed important for brain function. The black-boned chicken showed the highest choline and taurine contents, unlike that of the spent hens. In contrast, broilers presented the highest betaine content, which might be attributed to their lipid metabolism. L-carnitine content was abundant in black-boned and Thai native chickens. Moreover, the amounts of essential amino acids were high in Thai native chicken. In conclusion, black-boned chicken proved to be an excellent nutritional source for health-conscience consumers, whereas the Thai native chickens were flavourful and delicious.

• 한국가금학회지
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• 제48권4호
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• pp.217-225
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• 2021

국내 시중에서 유통되는 상용 육계 및 토종닭인 한협 3호, 우리맛닭 1, 2호 간의 품질특성 및 지방산 조성을 비교하는 것을 목적으로 수행된 본 연구에서, 육계와 각 토종닭은 서로 다른 품질특성을 나타냈다. 특히, 우리맛닭 1호 닭가슴살의 경우 토종닭 중 불포화지방산을 가장 많이 함유한 것이 특징이었으며, 우리맛닭 2호 닭가슴살은 육계 및 기존 토종닭에 비해 전단력이 낮고, 우리맛닭 1호 다리살은 육계보다 감칠맛에 영향을 미치는 arachidonic acid, docosahexaenoic acid의 함량이 유의적으로 높은 특성을 나타냈다. 따라서, 신품종 우리맛닭 1, 2호는 기존의 육계와 토종닭과 구별되는 품질 특성을 보이고 있어, 본 연구결과는 토종닭에 대한 기초 자료로 활용될 수 있을 것으로 생각한다.

• 한국가금학회지
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• 제38권3호
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• pp.225-230
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• 2011

토종닭과 일반 육계의 차이점을 확인하기 위하여 일반 육계를 토종닭과 동일한 사육 조건에서 사육하고, 2.0 kg 내외의 시기인 13주령에 맞추어 일반 육계도 도계하여 다소비 부위인 가슴육과 다리육을 분리하여 이화학적 차이를 분석하였다. 일반 육계의 가슴육 및 다리육에서 조지방의 함량이 토종닭의 조지방 함량보다 유의적으로 높게 나타났다. pH는 가슴육 및 다리육 모두 토종닭보다 일반 육계에서 유의적으로 높게 나타났으나, 보수력과 명도는 큰 차이가 없었다. 그러나 일반 육계의 가슴육에서 적색도가 높은 것으로 확인되었다. 조직감의 경우에 있어서는 신선 다리육의 씹힘성이 토종닭에서 높게 나타난 것 이외에는 토종닭과 일반 육계간의 차이가 없었다. 그러나 다리육에서 콜라겐 함량은 토종닭의 경우, 6.78 mg/g으로 일반 육계(3.12 mg/g)보다 2배 이상 높은 값을 나타내었다. 결론적으로 토종닭과 동일하게 사육한 13주령의 일반 육계는 토종닭과 비교하여 지방 함량이 너무 많고 콜라겐 함량이 적기 때문에 토종닭과는 유의적인 이화학적 차이를 보였다. 이는 일반 육계를 토종닭과 같은 조건으로 사육한다고 하더라도 육질이 토종닭과 유사해질 수 없음을 의미한다.

• 농업과학연구
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• 제49권1호
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• pp.173-173
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• 2022

• 한국축산식품학회지
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• 제31권5호
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• pp.684-692
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• 2011

The quality attributes of thigh meat from a certified meat-type commercial Korean native chicken (WoorimatdagTM, WM) and a commercial broiler (Ross, CB) raised under the same environmental conditions, were compared. One-d-old, mixedsex WM (200), and 200 broilers (Ross, CB) each were randomly assigned to floor pens (20 chickens per pen). The production stages (I, II, and III) were selected based on similar live weight. The crude fat contents of WM thigh meat were lower than those of CB. WM thigh meat contained higher stearic and arachidonic acid contents but lower palmitoleic and oleic acid contents compared to those of CB. The thigh meat color CIE $L^*$- and CIE $b^*$-values of WM were lower, but inosine-5'-monophosphate content was higher in WM than CB in whole production stages. WM thigh meat showed higher collagen content, hardness, springiness, gumminess, and chewiness than CB. In sensory evaluation, odor, taste, and overall acceptance were higher while color was lower in WM. Based on these results, it can be concluded that even if commercial broilers are raised under the same environmental conditions as WM, the unique quality attributes of WM thigh meat are distinctively unique.

• 농업과학연구
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• 제48권4호
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• pp.719-727
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• 2021

This study was conducted to evaluate the effects of mixed and separate gender feeding on the growth performance and carcass traits of Korean native chickens (KNC) compared to white semi-broilers (WSB) and a commercial broiler (CB) from hatching to 35 days. Here, 240 chicks were used with eight birds per cage in a randomized design with six replicates per breed. For the KNC lines, three groups of males (KNC-M), mixed-gender birds (KNC-FM) and females (KNC-F) were used. The two-phase feeding program used here consisted of a starter phase (days 1 - 21: crude protein [CP] 20% and metabolizable energy [ME], 3,050 kcal·kg^-1) and a grower phase (days 22 - 35: CP 18%, 3,100 kcal·kg^-1) for a commercial broiler. The WSB and CB were fed the only starter commercial diet. Fresh water and feed were provided ad-libitum. The results revealed that the KNC group had a lower (p < 0.05) body weight (BW) from day 7 and day 35 compared to that of the CB. Furthermore, the KNC group showed a lower (p > 0.05) average daily gain (ADG) relative to that of the CB during the entire experimental period. No difference (p > 0.05) was observed in the shank length among the treatments. There were also no significant differences in the growth performance or carcass traits between the KNC-M and WSB groups or in the genders of the KNC group.