• Journal of the korean veterinary medical association
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• v.37 no.7
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• pp.636-644
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• 2001

최근 우리나라의 젖소농가도 다두사육화, 후리스톨 우사에서 사육하는 농가가 늘고 있고, 열악한 우사와 좁은 운동장에서의 사육조건, 농후사료의 과다급여 등에 의한 분만 전$\cdot$후에 질병발생으로 인한 피해를 보고 있는 실정에 있다. 또한 금년부터 개시되어진 생우의 완전시장개방에 따른 우리 축산농가도 경쟁력을 갖추어 나가지 않으면 아니되며, 이에 일선의 대동물임상에 종사하고 있는 우리 수의사들도 무한 경쟁사회에 도래한 작금의 상황에 발맞추어 새로운 정보를 입수하여 자기개발을 위한 노력과 연구를 경주하여 나가지 않으면 아니된다 하겠다. 필자 역시 젖소와 한우 번식에 관련된 연구과제를 수행하기 위해 젖소농가들을 방문하여 조사하면서 느끼던 바가 젖소에서 분만 전$\cdot$후의 주요질병발생으로 인한 경제적인 피해를 많이 받고 있다는 낙농가들의 한결같은 목소리를 청취하였던 기회가 있어 이에 다시금 젖소의 분만 전$\cdot$후의 생리와 그 발생가능성이 높은 질병 특히 대사성 질병을 중심으로 피력하여 보면서 임상수의사분들께 조그마한 도움이 되었으면 한다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2002.10a
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• pp.112-113
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• 2002

생선회의 품질을 결정하는 중요한 요인은 씹힘성(촉감)으로, 생선회의 단단함(toughness)은 어종, 원료어의 신선도, 조리 후의 저장조건 및 치사방법 등에 따라 달라진다. 어육의 단단함은 생선회의 맛에 직결되어 육질이 단단한 어종일수록 양질의 횟감으로 선호되기 때문에 육질을 개선하기 위한 일련의 연구가 진행되고 있다. 즉, 운동사육에 의하여 근육의 장력을 발생시키는 방법, 사육수온을 변화시키는 방법, 한약재를 사료에 투여하여 육중의 결합조직의 함량을 증대시키는 방법 및 절식사육에 의하여 양식어의 육질을 개선하는 방법 등으로, 이 방법들은 어육의 actomyosin toughness나 background toughness를 향상시키는 방법들이다. (중략)

• 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)

• Korean journal of applied entomology
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• v.55 no.4
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• pp.421-429
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• 2016

Tenebrio molitor larvae contain large amounts of proteins, lipids and other functional materials, enabling this insect to be used as an edible food source in animal feeds and for industrialization. Although many efforts have been made to set up mass rearing systems, few studies have been conducted to establish optimal rearing conditions for the production of high quality T. molitor larvae. Herein we investigated 1) the effects of additional diets on the survival and fecundity of the insect, 2) the relationship between oviposition period and the uniformity of larval size, 3) the effects of rearing density and temperature on insect development, and 4) the storage stability of eggs and pupae at low temperatures given possible temporary production discontinuation. The addition of carrot and zucchini to the traditional wheat bran diet significantly increased the survival and fecundity rate of adult T. molitor. Of the three different oviposition sampling periods (3, 7, and 14 days) used to investigate the uniformity of the hatched larvae in each treatment, the period of 3 and 7 days provided higher uniformity than the 14 days oviposition period. Larval development was faster at $30^{\circ}C$ than at 20, 25, and $35^{\circ}C$. Interestingly, oviposition rates were highest at $20^{\circ}C$ but showed much slower larval development and lower uniformity at $30^{\circ}C$. Regarding the effect of larval rearing densities (1, 10, 20, 30, 40, and 50 larvae per 90 mm diam. dish), larval weight was significantly reduced at higher rearing densities, but larval longevity and length were not influenced by rearing density. The 30 larvae/dish is suggested to be a reasonable density to be applied to mass production systems. When kept at $4^{\circ}C$, T. molitor eggs showed a significant reduction in hatching rate; however, when stored under the same conditions, pupae emergence rates remained high until 10 weeks, suggesting that storage at low temperatures is more suitable for the pupal stage than the egg stage. Our findings suggest that an increase in T. molitor adult survival and fecundity rates and a uniformity of hatched larval development can be achieved with the following recommendations: a combination diet (including wheat bran), a 7-day oviposition period; a larvae-rearing temperature of $30^{\circ}C$, a rearing density of 30 larvae/dish, and the storage of pupal stages at low temperatures in the case of rearing discontinuation. This study serves as a strong foundation for the successful mass production of high quality T. molitor larvae.

• The Korean Journal of Malacology
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• v.27 no.4
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• pp.337-343
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• 2011

In order to know the effects of rearing conditions such as water temperature, salinity, larval stocking density, kinds and amounts of food organism and seedling collection method on seedling production of the brackish water clam, Corbicula japonica, the growth and survival rate of the larvae were investigated at each rearing condition. The shell length of larvae showed faster growth at $24^{\circ}C$ and $27^{\circ}C$, and survival rate showed good results at $18^{\circ}C$ and $21^{\circ}C$. Based on growth and survival rate according to water temperature, the optimal water temperature for larvae rearing was $24^{\circ}C$. At the salinity of more than 3 psu, the growth and survival rate were higher than 0 psu. The optimal salinities for larvae were 6-9 psu. Growth and survival rate of larvae were high at low stocking density and the optimum stocking density of larvae was 10 inds./ml. Daily feeding concentrations of 10,000-20,000 cell/ml of food organisms mixed Pavolva lutheri, Isochrysis galbana and Chaetoceros calcitrans were very effective. Full grown larvae collection from various substratum was significantly higt in sand, especially sand size was less than 0.25 mm.

• Food Science and Industry
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• v.55 no.2
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• pp.188-202
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• 2022

In the insect industry, as the scope of application of insects is expanded from pet insects and natural enemies to feed, edible and medicinal insects, the demand for quality control of insect raw materials is increasing, and interest in securing the safety of insect products is increasing. In the process of expanding the industrial scale, controlling the temperature and humidity and air quality in the insect breeding room and preventing the spread of pathogens and other pollutants are important success factors. It requires a controlled environment under the operating system. European commercial insect breeding facilities have attracted considerable investor interest, and insect companies are building large-scale production facilities, which became possible after the EU approved the use of insect protein as feedstock for fish farming in July 2017. Other fields, such as food and medicine, have also accelerated the application of cutting-edge technology. In the future, the global insect industry will purchase eggs or small larvae from suppliers and a system that focuses on the larval fattening, i.e., production raw material, until the insects mature, and a system that handles the entire production process from egg laying, harvesting, and initial pre-treatment of larvae., increasingly subdivided into large-scale production systems that cover all stages of insect larvae production and further processing steps such as milling, fat removal and protein or fat fractionation. In Korea, research and development of insect smart factory farms using artificial intelligence and ICT is accelerating, so insects can be used as carbon-free materials in secondary industries such as natural plastics or natural molding materials as well as existing feed and food. A Korean-style customized breeding system for shortening the breeding period or enhancing functionality is expected to be developed soon.

• Journal of Aquaculture
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• v.21 no.4
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• pp.265-271
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• 2008

Upper temperature tolerance of the turbot Scophthalmus maxim us, one of the popular aquaculture species in European community and China, was evaluated in terms of survival and growth at $20^{\circ}C$, $23^{\circ}C$, $26^{\circ}C$, or $29^{\circ}C$. Best growth was achieved at temperature $20^{\circ}C$ in this experiments. The fish exposed to $20^{\circ}C$ or $23^{\circ}C$ were comparable in survival, condition factor and feed conversion efficiency reminiscent of the latter temperature to be agreeable for the fish. The temperature over $23^{\circ}C$ appeared to be the temperatures beyond the fish can tolerate. For instance, the fish exposed to 26 showed mortality of 60.9% by day 60; none of the fish exposed to $29^{\circ}C$ survived beyond day 7. Culture densities between 80 and $200\;fish/m^2$ did not influence the survival, growth, condition factor and specific growth rate of the fish. The final production of the culture density experiment was $10\;kg/m^2$ on average. These results imply that the location where water temperature remains lower than $25^{\circ}C$ during summer can be a candidate site for the turbot aquaculture.

• Korean journal of applied entomology
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• v.42 no.3
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• pp.203-209
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• 2003

Biological characteristics of the almond moth, Cadra cautella, of which eggs will be substitute diets for Orius spp. and Trichogramma spp., were investigated and a mass-rearing system for the moth was developed. At 25$^{\circ}C$, egg, larval, and pupal period was 4.2, 29.8 and 8.3 days, respectively, and adult longevity was 5.8 days for female and 4.8 days for male. Total number of eggs at 20, 25 and 30$^{\circ}C$ was 128.9,207.9 and 139.9, respectively. The moth could be successfully reared with all food substrates tested, of which rice bran (50%)+chick feed (50%) assumed to be proper for massrearing in view of cost. Eggs could be stocked at 9 C for 7 days, representing 82% hatchability. In the rearing cage (16${\times}$24${\times}$9cm) used, 1,000 eggs was better for initial level of inoculation, showing relatively high emergence rate and adult weight. Mass-rearing procedures were explained in detail.

• The Korean Journal of Malacology
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• v.26 no.4
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• pp.303-310
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• 2010

Rearing condition and species of microalgae on growth and survival of the sunray surf clam, Mactra chinensis larvae were investigated for artificial seedling production. The larvae of M. chinensis on higher temperature showed high growth and low survival and was grown over $230{\mu}m$ in shell length 14 days after hatching, but low growth as $151.1{\mu}m$ at $18^{\circ}C$. The larvae of M. chinensis on salinity showed highest daily growth and survival as $11.3{\mu}m$ and 65.8% at 30 psu, respectively. The optimum of water temperature and salinity for the larval rearing were $23^{\circ}C$ and 30-35 psu over 25 psu at least. The density of larval rearing was below 10 per 1 ml in rearing seawater for elevating the development rate from D-shaped to settled (metamorphosing) stage. The larvae fed the mixed diet of Isochrysis galbana, Pavlova lutheri, Isochrysis sp. (green), Chlorella ellipsoidea showed highest growth and survival. The larvae fed the single diet of I. galbana, Isochrysis sp. (green) showed high growth and survival. But the larvae fed the single diet of P. lutheri and C. ellipsoidea showed low growth and survival. The optimum diet of larvae of M. chinensis was over two species of microalgae included I. galbana, Isochrysis sp. (green) for elevating the high growth and survival.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.375-376
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• 2001

조개류의 발생에서 온도는 초기 난할기의 세포 분열과 유생의 발생 및 사육에 큰 영향을 미치며, 대사율과 성장율에는 직접적으로, 영향-환경 측면에는 간접적으로 영향을 미치는 요인이다. 발생속도에 관한 연구는 단일 수온 조건하에서의 수온이 발생에 미치는 영향을 파악한 연구가 대부분이다(Ventilla, 1982). 그러나, 최근들어 나타나는 이상기온현상으로 인한 수계의 불안정과 수질 오염 등으로 인해 기존의 연구, 즉 단일 수온 조건하에서의 연구가 수정과 발생의 범위를 넓히기 어렵다. (중략)