• Monthly Korean Chicken
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• s.126
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• pp.84-88
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• 2005

필자가 담당하고 있는 충청지역에서 지난 여름과 가을에 걸쳐 조사한 바에 의하면 육계사육시 깔짚으로 왕겨를 사용하는 농가가 85% 정도였으며 이들 왕겨를 깔짚으로 사용하는 농장의 68% 정도가 깔짚을 최소 2회 이상 연속 사용하고 있는 것으로 나타났다. 나머지 8%의 농장이 톱밥을 사용하고 있었으며 톱밥을 깔짚으로 사용하는 농장의 99%가 2회 이상 깔짚을 재사용하고 있었다. 일부 농장의 4%는 왕겨와 볏짚을 혼합 사용하는 농장이 있었으며 왕겨와 볏짚을 혼합해서 사용하는 농장의 50% 정도가 깔짚을 재사용하고 있었다. 볏짚만 사용하는 농장도 있었으나 깔짚을 재사용하지는 않았다. 육계사육에서 깔짚을 연속 사용하는 이유는 현실적으로 뚜렷하게 대두되고 있는 상황이지만 그에 대한 변화된 사양관리는 뚜렷하게 정립된 내용이 없어서 사육성적이 문제가 되고 있다. 특히 올 겨울에는 유류가격 인상으로 인한 환기량이 감소될 우려가 있고 병아리 가격이 생산비 이하로 형성되면서 병아리 품질문제가 발생할 수 있으며 깔짚 연속 사용으로 인한 계사내부 환경불량 등 세 가지 요인에 의해 질병발생이 높아질 것으로 예상되고 생산성이 극도로 나빠질 것으로 우려된다. 따라서 필자는 올 겨울에 깔짚을 연속사용 할 때 어떤 방법으로 사육을 해야 정상적인 사육성적이 나올 수 있을 것인지 몇 가지 주요 핵심사항만 본고를 통해서 점검함으로써 여러분의 사육성적 향상에 도움이 되고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.1
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• pp.456-463
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• 2019

Micro climatic conditions within the livestock facility are affected by various factors such as ventilation, cooling, heating, insulation and latent and sensible heat generation from animals. In this study, numerical BES method was used to simulate energy flow inside the poultry house. Based on the BES method and THI concept, degree of thermal stress of poultry was evaluated according to the locations in South Korea. Comparison of THI values within the poultry house was also carried out according to the stocking densities to reflect recent animal-welfare issue. Significant decrease in thermal stress of poultry was observed when the stocking density of $30kg/m^2$ was applied in the change of the seasons(p<0.05) however, there was no statistically significant difference in summer season(p>0.05). It meant that installation of proper cooling system is urgently needed. For Iksan city of Jeollabuk-do province, total 252 hours of profit for thermal stress was found according to decrease in the stocking density.

• Journal of Animal Environmental Science
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• v.18 no.3
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• pp.183-190
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• 2012

The objective of this study was to evaluate the effects of an unexpected change in housing environment on stress in poultry. Laying hens (Hy-line Brown), adapted to a free-range housing system for more than a month, were randomly divided into two groups to be subjected to an unexpected change of their housing environment: one half of them were individually housed into conventional battery cages and the other continually left in the same housing system throughout the entire period of the study. The sudden change resulted in an increase in egg production and albumen height (P<0.05), but decrease in eggshell thickness (P<0.05). The change had tendency to increase Haugh unit ($P{\leq}0.061$) and to decrease eggshell color ($P{\leq}0.074$), but did not affect body weight for 5 days thereafter. No significant changes were detected in liver color. Plasma concentrations of corticosterone was acutely increased one day after the change (P<0.05), then returned to similar control levels. The results of the present study indicate that unexpected changes in housing environment cause acute increase in stress hormone concentrations, but interpretation of the results should be cautious due to the experimental conditions.

• Journal of Aquaculture
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• v.16 no.4
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• pp.257-261
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• 2003

The effects of different stocking densities on the growth of juvenile abalone, Haliotis discus hannai and water quality in the recirculating system with rotating biological contactor, were assessed. The trials were conducted using total weight 32 g juveniles abalone for 60 days at stocking densities of 5, 10, 15 kg/$m^2$. The animals were fed sufficient amounts of the pellet diet of 30.4% protein during the experimental period. Daily feeding rate (DFR) and survival rate (SR) of 5 kg/$m^2$ showed 0.76% and 85.5% those were not significantly differed 10 kg/$m^2$ showing 0.75% and 96.0% (P>0.05). DFR and SR of 15 kg/$m^2$ showing 0.38% and 31.2% were significantly lower than 5 and 10 kg/m2 (P<0.05). Daily growth rate (DGR) and feed efficiency (FE) showed the highest as 0.19% and 24.2% in 5 kg/$m^2$ the lowest as 0.05% and 14.3% in 15 kg/$m^2$ (P<0.05). According to, these results was an inverse relationship between growth and stocking density. The optimum density of juvenile abalone from this experiment is 5 to 10 kg/$m^2$ in the recirculating system.

• Journal of Marine Life Science
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• v.7 no.2
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• pp.139-144
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• 2022

This study aims to investigate egg quality changes and free amino acid composition. Factors that can affect egg quality about farming conditions were investigated through biochemical analysis of egg by red spotted grouper, Epinephelus akaara. As a result, the buoyant, fertilization embryonic survival and hatching rate were better when reared in sea cage than in tank. And the content of free amino acid in fertilized eggs reared in sea cage was higher then in tank. In conclusion, fertilized eggs with good egg quality can be produced when farming sea cage, and contained more free amino acid.

• 월간낙농육우
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• v.34 no.8
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• pp.108-112
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• 2014

농장에서의 혹서기를 위한 환기관리 포인트란 무엇일까? 우선 우사는 개방식 축사이기 때문에 햇빛과 바람 관리만 잘 해도 우사 환경은 개선되는데, 계절적으로 혹서기로 접어들면서 소가 더위에 시달리며 높은 온 습도에 의하여 사육하기가 힘들다는 농가가 많다. 특히 환기는 외부의 기상조건과 소의 사육단계 등을 근거로 단열 수준과 환기량을 결정해야 한다. 그리고 온 습도 뿐만 아니라, 풍속 풍향 등의 기류 상태 및 세균, 먼지, 탄산가스, 암모니아가스, 냄새 등 생물 화학적 상태를 적절한 수준으로 유지해야 소의 생산성과 사료효율을 최적화 할 수 있다. 따라서 본 원고에서는 혹서기 시설 및 환경관리를 통한 여름나기 축사환기 관리방법에 대하여 알아보고자 한다.

• KOREAN POULTRY JOURNAL
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• v.50 no.12
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• pp.132-135
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• 2018

정부는 100대 국정과제 중 하나로 2025년까지 "깨끗한 축산농장" 10,000호 조성을 선정하였다. 축산농가의 자발적인 노력으로 깨끗한 환경에서 가축을 사육하여 국민에게 사랑받는 축산업으로 발전하는 기틀을 마련하기 위해서이다. "깨끗한 축산농장"은 가축사육 환경을 개선하여 농가는 안전하고 품질 좋은 축산물을 생산하고, 지역 주민에게 쾌적한 생활환경을 제공하는 농장을 선별하여 선정한다. 이에 본지는 "깨끗한 축산농장"으로 선정된 세종특별자치시 전의면 소재의 천금농장(산란계)을 찾았다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.295-296
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• 2001

우리나라의 해수어류 양식생산량은 사육환경, 사육관리조건 및 적조, 냉수대, 저염 분수의 양식장내 유입 등 자연재해에 의해 생산량 변동이 심하여 어가의 불안정한 요인으로 작용하고 있다. 집약적 어류양식에서 발생하는 부적당한 환경, 영양 및 인위적 스트레스는 어류의 최적 성장을 저해하며, 양식생산의 계획화에 지장을 초래한다. 환경요인중 수온, 염분 및 수질의 급변은 양식어류에 상당한 스트레스 요인으로 작용하는데, 이중 염분변화는 어류의 체내 삼투압 변화를 유도하고, 이때 어류는 체내 항상성을 유지하기 위하여 삼투압 조절을 한다. (중략)

• Journal of Marine Life Science
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• v.3 no.2
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• pp.67-73
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• 2018

This study was conducted to investigate the influence of environmental factors such as water temperature, salinity, rearing density and feeding amount on the survival and development of larvae in surf clam, Tresus keenae. As a result of this study, the optimum conditions of larval rearing were as follows. The optimum range of water temperature is 20℃ to 24℃, the optimum salinity is 30 psu, the optimum rearing density is 5 ind./ml and the supply of mixed feed organism for larva rearing such as Isochrysis galbana, Chaetoceros simplex and Tetraselmis suecica is 10×10⁴ cells/ml. The results of this study suggest that the optimum conditions of environmental factors in larval rearing of Tresus keenae contribute to productivity improvement through rapid growth and high survival.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.388-394
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• 2020

This study was undertaken to evaluate and compare the status of animal welfare, environmental level, and sow behavior, by including two farmhouses with sow group housing but having different floor types, viz., litter floor and slat floor. Animal welfare level was evaluated for body and vulval wounds of sows. The environmental level was measured for a total of 4 months, assessing the concentrations of H2S, NH3 and CO2 inside the pig house, once a month. Results of this study indicate that the level of animal welfare, with respect to body and vulval wounds, was better in the concrete slat floor farmhouse (H) than in the litter floor farmhouse (K). Environmental levels obtained (in ppm) were: H2S (H, 1.0; K, 0.0), NH3 (H, 45.4; K, 1.3), and CO2 (H, 1102.3; K, 258.8), indicating higher levels in the H than in K farmhouse. Aggressive behavior was mainly encountered in the H farmhouse. These results indicate that the same group housing system, but with different flooring, results in changes pertaining to aggressive behavior and environmental levels. It is therefore necessary to study the behavior changes, welfare, and environmental levels while deliberating different floor types.