• KOREAN POULTRY JOURNAL
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• v.7 no.11 s.73
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• pp.54-79
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• 1975

• KOREAN POULTRY JOURNAL
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• v.6 no.11 s.61
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• pp.33-48
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• 1974

• KOREAN POULTRY JOURNAL
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• v.4 no.11 s.37
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• pp.86-97
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• 1972

• KOREAN POULTRY JOURNAL
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• v.6 no.9 s.59
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• pp.29-32
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• 1974

최근 가금학 분야의 연구 보고서들을 검토하여 보면 닭 사회에서 일어나는 여러 가지 행동현상과 이들이 산란 및 산육능력에 미치는 영향에 관하여 연구한 재미있는 논문들이 많다. 이러한 것들을 정리하여 소개하는 것도 양계관리에 도움이될 것으로 믿어 소개하는 바이다.

• Korean Journal of Poultry Science
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• v.15 no.2
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• pp.95-114
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• 1988

채란계의 생산성향상은 실용계의 유전적인 생산능력의 개량과 환경 및 사양관리 기술의 개선에 의하여 이루어 질 수 있는데 아무리 사양관리를 잘하여도 그 닭이 가지고 있는 유전적인 생산능력이 좋지 못할 경우 소기의 목적을 달성할 수 없으므로 채란계 산업의 성공적인 경영을 위해서는 생산성이 높은 우수한 계종을 선택하여야 한다. (중략)

• Korean Journal of Poultry Science
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• v.47 no.4
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• pp.237-245
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• 2020

This study investigated the effects of breed, laying age, and egg storage period on hatching performance. Eggs were collected from early laying period (27 to 29 weeks old) and late laying period (50 to 52 weeks old) in Hwanggalsaek Jaeraejong, Korean Rhode Island Red, and Korean White Leghorn chicken breeds. Eggs laid for each period were stored for 3, 7 and 14 days and then hatched. Fertility, hatchability, and embryonic mortality were observed to determine the hatching performance. The results showed that hatching performance was affected by breed, laying age, and egg storage period with independently or interactively. The Korean Rhode Island Red breed had the lowest hatching performance. Hatchability and early embryonic mortality rate increased in early laying period eggs compared to the late laying period, but the late embryonic mortality rate increased in late laying period eggs. Additionally, hatching performance decreased as the egg storage period increased. Using breed-specific hatching management techniques, avoiding late laying period eggs, and shortening the egg storage period to seven days after laying may improve the hatching performance.

• Korean Journal of Poultry Science
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• v.45 no.2
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• pp.109-118
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• 2018

A great progress in genetic selection, nutrition and management practices has contributed to the improved growth rate of broilers and egg production in laying hens. For the increased productivity of modern poultry, a healthy chicken liver needs to cope with the increased metabolic demands. The liver is the major site of de novo fatty acid synthesis; therefore, hepatic lipogenesis is crucial for producing better quality meat and eggs. When de novo lipogenesis exceeds the capacity of lipid metabolism and secretion, large amounts of lipids accumulate in the liver of broilers, leading to a fatty liver. Upon onset of egg-laying in hens, lipids including free fatty acids, triglycerides, and phospholipids are dramatically increased in blood plasma for the synthesis of yolk precursors in oocytes. Productive hens with fatty liver often have hemorrhagic syndrome and sudden death due to the heavy demands of yolk synthesis, which burdens the liver. Understanding the lipid metabolism and hepatic lipid disorders is a key point in the improvement of the growth and production of chickens. This review focuses on the recent studies on lipid metabolism, the hepatic lipid disorders, and the prevention or reduction of fatty liver in poultry.

• 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.

• KOREAN POULTRY JOURNAL
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• v.4 no.3 s.29
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• pp.92-97
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• 1972

B.S.Pomeroy 박사의 산란계 질병에 대한 예방과 치료약품을 소개함과 아울러 현재 국내에서 발생되는 질병명 및 시판되는 약약품등을 필자의 편의대로 설명하였다. 국내에서 발병되는 질병명은 한국가금협회 산란계 능력검정시(1971.8.1$\~$1972.1.31)안양 가축위생연구소에 의뢰한 가검물의 진단을 참고로 한 것인데 요약하면 CRD, 마렉병, 곰팡이성폐렴, 살모넬라 균증, 류코싸이토준증, 임파구성백혈병, 지방과자등, 대장균증, 뇨산침착증, 간파열증, 장염, 비특이성장염, 혈종, 탈홍등이다.

• Korean Journal of Poultry Science
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• v.23 no.1
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• pp.27-37
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• 1996

This experiment was carried out to study the effects of feeding split diets for a.m. and p.m. on laying hen performance and feed cost with 480 ISA Brown layers for three periods during 32∼36, 52∼56 and 72∼76 wk of age, respectively. The control group(C) was fed a conventional single diet throughout the day and split diet groups (T$_1$, T$_2$, T$_3$, T$_4$ and T$\_$5/) were offered high energy-high protein-low Ca diets, and low energy-low protein-high Ca diets in a.m. and p.m., respectively. In split diet groups, feed intake, ME and CP consumption, and feed cost were significantly reduced(P<0.05) compared to the C, while the hen-day egg production was significantly improved. However, the average egg weight was not influenced by the feeding system. Due to the reduced daily feed, ME, and CP intakes, and the improved egg production, the conversions of feed, ME, CP, and feed cost required per kg egg mass were also significantly improved (P<0.05) in splits diet groups. Among split diet groups, the T$_2$ group fed the diet devoid of Ca supplement from the conventional laying hen diet in a.m., and the diet containing the Ca supplement 2 times the conventional diet in p.m., was superior in conversion of nutrients and feed cost per kg egg mass to the other split diet groups. It was concluded that daily feed and nutrients cousumption and daily feed cost could be reduced 5∼6％ while hen-day egg production could be improved about 4％, so that about 10％ of the feed and nutrients and feed cost per kg egg mass could be spared by introducing the split diet feeding for a.m. and p.m. based on T$_2$ treatment in laying hens.