• KOREAN POULTRY JOURNAL
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• v.44 no.3
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• pp.136-141
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• 2012

본고는 국내 육용종계 질병 실태를 조사하여 국내 육계산업의 전반적 발전기반을 기하는 차원에서 경북대학교 김기석 교수팀이 지난 '10년 11월부터 '11년 말까지 "국내 질병발생 동향 및 대응방안과 병아리 이력제 및 품질 보증제에 관한 연구"를 수행한 바 있다. 본고는 육용종계의 난계대 질병 위주로 조사한 자료를 바탕으로 요약된 내용을 발췌 게재 한 것이다.

• Monthly Korean Chicken
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• v.14 no.12
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• pp.105-112
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• 2008

올해 연중기획을 통해 닭고기가 어떤 과정을 거쳐 생산되고, 제품화 되는 지에 대해 알아보았다. 알에서 깨어난 병아리는 큰 닭이 되어 도계돼 신선육 상태로 포장되어 시장에서 판매되고, 또 너겟이나 훈제, 삼계탕 등으로 가공되어 마트에서 판매되고 있다. 이번호에서는 지난 11개월에 걸쳐 소개됐던 맛있는 닭고기가 식탁에 오르기까지의 생산과정에 대해 총정리하고자 한다.

• Monthly Korean Chicken
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• v.16 no.6
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• pp.124-126
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• 2010

양계인이라면 누구나 생독백신 접종 후에 나타나는 백신접종반응(기침 등 호흡기 증상)은 적으면서 백신접종효능(항제 형성능 및 질병방어효과)은 아주 우수한 그런 종류의 생독 백신이나 접종법을 찾게 마련이다. 국내의 경우 1일령 병아리에 대한 닭 뉴캣슬병 생독백신 접종이 의무화되어 있어 부화장에서 병아리 분양 시 분무백신기를 이용한 닭 뉴캣슬병 생독백신을 접종하게 되고, 또한 농장에서 닭 뉴캣슬병 추가백신 접종이나 닭 전염성 기관지염 백신 접종 시에도 분무접종을 실시하기도 하는 등 분무접종에 대한 경험은 누구나 가지고 있을 것이다. 그러나 음수접종법과 달리 분무접종 시 심한 백신접종반응을 경험하게 되는 양계인들도 쉽게 만나볼 수 있다. 생독백신은 음수접종법을 비롯하여 점안접종법 및 분무접종법 등 다양한 접종방법이 현재 야외농장에서 응용되고 있으며, 국내 육계사육 시에는 음수접종법과 분무접종법이 주로 사용되고 있다. 하지만 동일한 종류의 생독백신이라 할지라도 백선접종방법에 따라 백신접종 후 백신접종효능뿐만 아나라 백신접종반응에도 많은 차이를 보이게 되며 동일한 분무접종법이라 하더라도 어떠한 입자 크기의 분무기를 사용했는가에 따라서도 이러한 차이는 있다. 분무접종은 백신 바이러스가 비강，눈(harderian gland) 뿐만 아니라 상부 호흡기도에 직접적으로 작용을 하여 강력함 국소면역능을 유발하는 장점을 가지고 있으나 접종일령이나 접종 백신의 종류를 고려한 분무입자 크기의 선택이 제대로 이루어지지 않아 음수접종법에 비해 접종 부작용이 크게 나타나는 백신접종법으로 인식되어 있는 실정이다. 따라서 이번 호에서는 호흡기 질병의 예방 백신 분무접종에 대해 알아보고자 한다.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.87-88
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• 2003

Saccharomyces cerevisiae(SC)가 육계의 성장능력과 육질 개선효과가 있는지 알아보기 위하여 2회의 사양시험을 수행하였다. 실험1에서는 갓 부화한 160수의 수컷 병아리를 두 처리로 나눈 후에, 각각 0 ％ 와 3.0 ％의 SC를 함유한 사료를 5주간 급여하였다. 실험2에서는 240수의 수컷 병아리를 4처리로 나눈 후, 각각 0, 0.3, 1.0 및 3.0 ％의 SC를 역시 5주간 급여하였다. 실험1에서는 SC 급여구는 무급여구에 비하여 체중이 무거운 경향을 보였으나 유의성은 없었다 (P＞0.05), 실험2에서는 SC 급여수준이 증가함에 따라 체중과 사료섭취량이 유의하게 증가하였다(linear P＜0.05). 실험1에서 SC 첨가는 다리근육(drumstick)의 전단력을 유의하게 감소시켰으나, 삶은 다리근육 에서는 이러한 효과가 관찰되지 않았다. 실험2에서는 흉근과 대퇴근 및 다리근육 및 피부의 산화 안정성은 SC 첨가에 의하여 유의하게 개선되었다.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.73-74
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• 2003

Three experiment were designed to determine the effects of dietary(n-3) fatty acids on the growth-suppressive effects of the inflammatory response and anti-oxidant enzyme activity and balances of nitrogen and energy. Day-old chicks were fed diets containing 1.0 ％ soybean oil in experiment 1, or diets containing 1.0 ％ of fish oil in experiment 2, and then on 7-d of age chicks were fed diets containing 1.0 ％ of either soybean oil or fish oil. In experiment 3, day-old chicks were fed on diets containing 1.0 ％ of either soybean oil or fish oil. In chicks of half pens within each dietary treatments of each experiments, the acute phase response were induced by injecting with Salmonella typhymurium lipopolysaccaride(LPS) i.p. 3 times at 8, 10 and 12-d of age. During acute phase response, chicks fed dietary fish oil from 1-d of age enhanced energy balances and did not give negative effect on nitrogen balance and uric acid excretion, but elevated MnSOD and Cu/ZnSOD activity In liver and erythrocyte cytosols compared with those fed dietary soybean oil. The results indicated that enhanced daily gain and metabolizable energy value of diet in birds fed fish oil from one-d of age seems due to change on the antioxidants systems during acute phase response.

• Korean Journal of Poultry Science
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• v.48 no.3
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• pp.143-150
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• 2021

In this study, we investigated the effects of light intensity on broiler chick growth performance, blood parameters, and stress levels. A total of 240 one-day-old male Ross 308 broilers (47.97±0.166 g) were subjected to three different intensities of light (20, 30, and 50 lx), with each treatment being conducted with four replicates. On the seventh day, the growth performance (body weight, feed conversion ratio, and breast muscle and liver weights) and blood parameters were determined; the levels of serum corticosterone, interleukin-6 (IL-6), and tumor necrosis factor-α were also evaluated. The body weight, weight gain, liver weight, and breast muscle weight of chicks exposed to a light intensity of 50 lx were significantly increased compared with those of chicks subjected to 20 lx (P<0.05). No significant differences were observed in the leukocyte, erythrocyte, and platelet counts and the biochemical profile exceptions being the levels of glucose and inorganic phosphorus in the blood of the chicks in the three light intensity groups. However, serum corticosterone and IL-6 levels were the highest in chicks exposed to a light intensity of 20 lx (P<0.05). In conclusion, the findings of this study indicate that broiler chicks exposed to higher light intensity (50 lx) show significant improvements in terms of weight gain and corticosterone and IL-6 levels. Thus, high light intensities enhanced the growth performance, stress levels, and immune status of broiler chicks.

• Korean Journal of Poultry Science
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• v.46 no.1
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• pp.1-10
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• 2019

The most important times during the development of young chicks are the days immediately prior to hatching and the days immediately after hatching, known as the perinatal period. A sufficient supply of nutrients during the perinatal period is a crucial during the late stage of embryonic development and the starvation period of the young chicks. The delayed post-hatch holding time can restrict the development of the gastrointestinal tract, reduce final body weight, impair muscle development, and change immunological capacities. These symptoms are deleterious to the development of young chicks. Therefore, the post-hatch holding time and its influence on the fitness of young chicks are major concerns to the poultry industry. The in ovo feeding is a practical technology for perinatal nutrition to optimize poultry production and for attenuating the stress experienced by fasting young chicks. This study will discuss in ovo feeding and its effect on the development of the chick embryo, the establishment of a healthy microbiota, and the improving immune response.

• Korean Journal of Poultry Science
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• v.35 no.1
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• pp.85-99
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• 2008

Avian reovirus (ARV) is a causative agent of viral arthritis/tenosynovitis, and malabsorption syndrome in broiler. The characteristics of malabsorption syndrome caused by ARV are diarrhea, poor feed conversion and stunting. Therefore, ARV infection has been recognized as one of the most important disease in the poultry industry because of economical losses. However, few study of ARV infection in broiler industry has been conducted in Korea. To evaluate the presence of ARV infection in broiler farms, epidemiological survey such as serological test and virus isolation has been conducted. For the serological survey using ELISA method, we selected five broiler farms which were located at different area and had a history of growth retardation, lameness, diarrhea and poor feathering. From these farms serum samples were collected at 1 day, 14 days and market age. All these farms had no history of vaccination against ARV. In addition to serological survey, we tried to isolate ARV from birds of designated farms at market age and collected feces and tissue samples such as cecal tonsil, intestine and liver. We were identified ARV by RT-PCR and transmissible electron microscopy. The samples were inoculated into 9-day-old embryonated eggs via the chorioallantoic membrane to observe the pock formation. For the pathogenicity test of ARV isolates, we inoculated with the isolates to the right footpad of 3-week-old SPF chicks and observed clinical signs and pathological changes for 14 days after challenge. Most broilers sampled for serological survey have maternal antibodies which were widely distributed at 1 day and decreased by 14 days. However, at the market age several broiler farms showed fairly high antibody titer against ARV. This increase of antibody titer at market age means the possible infection of ARV during the grow-out period. Among total 15 samples for the isolation of ARV. 2 samples were positive by RT-PCR and finally identified as a ARV. We inoculated these isolates in the SPF birds and observed that the antibody titer was increased from 7 days after challenge. However, we did not find any clinical signs both control and challenge groups. Based on the above results, it is clear that the ARV infection has been circulated in the broiler industry and caused significant economic losses. Further study is needed to evaluate the virulence of the isolates in the digestive system of broiler and the molecular characteristics of isolates.

• Korean Journal of Poultry Science
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• v.49 no.3
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• pp.139-144
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• 2022

This study was conducted to investigate the effect of three different photoperiods on growth performance, blood properties, and stress indicators in broiler chicks between 1-7 days after hatching. Two hundred and fifty-two 1-day-old male broiler chicks (57.0±0.12 g) were divided into three treatments, with 4 replicates per treatment and 22 birds per replicate subjected to three different photoperiods of 24L, 22L/2D and 18L/6D. A light-emitting diode bulb served as the light source, with an illuminance of 30 lx. As an experimental diet, a commercial feed based on a corn-soybean meal, with 22% CP and 3,150 kcal/kg ME diet, and water were fed ad libitum. Body weight gain, feed conversion ratio, and liver weight ratio showed a statistically significant difference between the 18L/6D and 24L treatments (P<0.05), but with no significant difference between the 22L/2D treatment and either the 24L or 18L/6D treatment. The breast meat ratio was 5.59% in the 18L/6D treatment group, which was lower than that of other treatment groups (P<0.05). The triglyceride levels were highest (P<0.05) in the 18L/6D treatment among treatments, but alanine aminotransferase levels were significantly higher (P<0.05) in the 22L/2D treatment than in the 24L treatment. Levels of cytokines, i.e., Interleukin-6 and Tumor Necrosis Factor-α did not show a significant difference among the treatments, but corticosterone content was significantly higher (P<0.05) in the 24L treatment than in the 18L/6D treatment. In conclusion, 22 hours of lighting is appropriate between 1~7 days after hatching, considering growth performance and the overall health of broiler chicks.

• Monthly Korean Chicken
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• v.18 no.10
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• pp.114-119
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• 2012

양호한 육추 관리는 언제나 좋은 계군(鷄群) 체중의 균일도(均一度)를 가져올 것이다. 균일도는 양호한 일관성(一貫性)있는 성적을 얻는 열쇠이다. 그리고 처음 14일간 불량한 육추 관리를 한 뒤에는 양호한 균일도에 도달될 수 없다. 결정적으로 중요한 인자들은 온도, 공기 품질, 물과 사료이다. 이들 관리가 정확하게 실시되면 당신의 성공은 80%가 달성될 것이다. 언제나 환기(換氣)를 위해서 온도(溫度)를 결코 희생(犧牲)하지 말아야 하고, 그리고 온도를 위하여 결코 환기를 버리면 안된다는 것을 잊지 말라.