• Korean Journal of Poultry Science
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• v.17 no.1
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• pp.1-6
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• 1990

For the production of tetraploid embryos in chicken through induction of diploid gametes. The experiment was found results as follows; 1. Induction of diploid sperm was observed 11% from embryos of normal females and males at 12 days after injection of 0.37mg per 2kg body weight for three days. 2. 3 among 109 embryos from crosses of diploid gametes induced by TEM were found as tetraploid. 3. Genetic structures of tetraploid embryos were indentified as normal 4 pairs chromosomes without certain variation.

• Journal of Aquaculture
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• v.10 no.3
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• pp.373-380
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• 1997

The experiments were conducted to improve the mass production of Nile tilapia, Oreochromis niloticus, seed in closed recirculation systems. It was observed that smaller females (340g av. body weight) under lower stocking density (1.2 kg/$m^2$)) group produced 3.6 times more fry than larger females (612g av. body weight) under higher stocking density (2.1kg/$m^2$) group when the fry were collected at 30 days after the broods stocked. The clutch removal method where the eggs and sacfry were collected from female mouth followed by artificial incubation showed improved seed production, when compared to the traditional natural mouth-brooding method by harvesting free swimming fry from brood tanks (P<0.05). Under the clutch removal method, short-term incubatin of brooders (14 days) was proven to be more effective than long-term incubatin (21 days). Hatching success of clutch removed eggs was ranged from 55.7 to 91.5% in 1.8$\ell$ of upwelling incubators depending on the different development stages.

• Horticultural Science & Technology
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• v.18 no.4
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• pp.499-502
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• 2000

Five local cultivars of northern type garlics (Allium sativum L.) and one of southern type were collected, and their growth and developmental characteristics and productivity were investigated to select a well adaptable cultivar in Euiseong region. Local cultivars used in this experiment were 'Euiseong', 'Yeochun', 'Danyang', 'Jungsun', and 'Yongin' as northern type and 'Namdo' as southern one. The growth characteristic of local garlic cultivars were differed with their ecotypes and 'Namdo', a southern type cultivar, showed higher growth rate at the early growing stage than northern types. However, no clear differences were observed among northern types. Incidence of bolting was low in 'Jungsun' and 'Yongin', while high in 'Euiseong' and 'Yeochun'. In the case of incomplete bolting, however, an opposite trend was showed, thus, high in 'Jungsun' and low in 'Euiseong' and 'Yeochun'. Secondary growth was remarkably low in 'Euiseong'. Considering yield factors, 'Yeochun' seemed to be most promising northern type cultivar in Euiseong region, which showed highest bulb weight and largest cloves with high growth rate at the maximum growing stage. 'Danyang', 'Jungsun', and 'Yongin' seemed to have relatively low productivity in Euiseong region.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1994.04a
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• pp.109-115
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• 1994

지난 날에는 생산공장 기기들의 정비에 진동분석 이용은 거의 전무한 상태이었으며 과학이 발달된 이 즈음에도 고장이 날 때까지 기기를 혹사하고 고장이 난 후에야 많은 시간과 경비를 들여 기기를 재가동 함은 물론 공장가동 중단으로 인한 생산성 상실이 산업계에 주는 영향은 크다. 경우에 따라서는 기기전체를 교체하는 큰 대형사고로 이어질 수 있기 때문에 공장 전면 조업에 큰 차질을 빚게된다. 시태크(Time tech)와 Re-Engineering과 같은 최첨단 경영방침에 부응하기 위해서는 구태의연한 가동파괴정비나 정기점검 정비방법을 탈피하여 최신 진동분석 기술을 이용한 예방정비(predictive maintenance)를 채택하는 것이 바람직하다. 과학기술 발전에 힘입어 정확한 진동자료를 수집할 수 잇는 주파수분석기(FFT analyzer)나 자료수집기 (data collector)와 진동자료를 심층분석하여 정확한 진동해결방안을 제시할 수 있는 software가 개발되어 사용화 되어 있는바 관계기술 요원들의 진동에 대한 이해와 기술습득으로 한차원 높은 기기정비를 통해 효율적인 생산성증가, 정비비용감소, 안전사고 미연방지등 많은 것을 함께 얻을 수 있다.

• Journal of Plant Biology
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• v.24 no.1
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• pp.31-45
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• 1981

The purpose of this study aimed to study effects of fire on vegetation and soil properties after the first growing season in Mt. Chiak. 1. With the basis of importance value of species in each stand, status of species was assessed for three categories; Increaser species, Decreaser species, and Neutral species. 2. Biomass was 2.2 times higher on burned area than unburned. This indicates that biomass was remarkably increased after fire. 3. To evaluate similarity, coefficients of similarity among communities were obtained, and correlation coefficients were also estimated. These indices showed that burned and unburned community were markedly different.. $B_1$-stand and $B_1$-stand appeared most similar to each other among stands. 4. Species diversity was greater in burned than unburned stands. 5. Soil pH value and organic matter content in burned area were significantly higher than those in unburned area. However, soil water content was lower in burned area. There was no effect of burning on soil pH value and water content at 15~20 cm depth of soil. 6. All chemical compositions except sodium were much higher in soil surface. The decreases in sodium levels at surface were probably resulted from the rapid leaching due to the increased solubility and decreased capacity for adsorption of sodium in comparison with potassium or calcium. Among chemical compositions of soil amount of nitrogen showed least difference between the burneb and unburned surfaces soil.

• KOREAN POULTRY JOURNAL
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• v.8 no.8 s.82
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• pp.119-122
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• 1976

지난 10년간의 돌이켜보면 국내양계업계는 장족의 발전을 거듭하였다. 그러나 이와 비례하여 양계업자간의 경쟁이 그만큼 치열해졌다. 뿐만 아니라 장래에는 외국의 양계업계와 어깨를 나란히 하여 그들과 경쟁할 경우도 예상하여야 할 것이다. 이와 같이 업계의 격화하여가는 경쟁에서 낙오되지 않고 업체를 유지하며 경쟁에서 승리하자면 무엇보다도 양계기술의 향상과 경영의 합리화 및 생산성 향상을 꾀하고 생산비용의 절감에 주력하지 않을 수 없게 되었고 75년도 말로서 감면기간은 끝나 금년도부터는 소득금액의 50$\%$에 상당하는 세금이 부과될지도 모른다는 사실을 두고 볼 때 과거 어느 때보다도 양계 경영 기장에 유의하지 않을 수 없다 하겠다. 특히 양계경영은 내일을 예측할 수 없는 경영난의 어려움을 항상 가져야 한다는 것과 농산물도 마찬가지 이겠으나 양계업의 주산물인 계란과 육계의 가격을 시장에서 형성된다는 점에서 보다 합리적인 기장의 필요성을 갖게 되는 것이다. 다른 공산품의 제조와 달리 양계업의 제조(생산)과정의 기장에는 이렇다할 기장원칙이 성립되지 않는 본 업계의 문제점을 두고 볼 때에 비용의 처리에 세심한 주의를 요한다. 이에 본인은 업계의 추세를 중시하고 국내외의 서적과 이 분야에서의 경험과 타업종에서 추진되고 있는 기장의 합리화와 원가계산제도의 경향을 바탕으로 하여 양계경영에 적용될 생산원가산출과 기장에 대하여 부족하나마 $\ulcorner$월간양계$\lrcorner$에 게재하면서 함께 연구하고자 한다.

• Korean Journal of Poultry Science
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• v.48 no.4
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• pp.169-176
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• 2021

An experiment was conducted to investigate the effects of varying levels of hydrolyzed yeast on egg production and egg quality in aged laying randomly allotted to three dietary treatments such that egg production was similar in each treatment (6 replicates of 10 birds each). The layers were fed diets containing 0, 0.1, or 0.2% hydrolyzed yeast for eight weeks. No significant difference was observed in egg production during the first half of the experiment. Egg production and daily egg mass in groups fed diets containing hydrolyzed yeast were significantly higher (P<0.05) than those of the control groups during the second half of the experiment. Egg weight was not affected by the dietary treatment. Eggshell strength and thickness in groups fed diets containing hydrolyzed yeast were significantly higher than those of the control groups during the overall experimental period (P<0.05). Although no significant differences were observed in the Haugh units, yolk color in the group fed diets containing 0.1% hydrolyzed yeast was significantly higher than that in the control group (P<0.05). The mammillary layer thickness increased in a linear manner and significantly following treatment with dietary hydrolyzed yeast (P<0.05). Antibody titer against avian influenza virus in the group fed diets containing 0.2% hydrolyzed yeast was significantly higher (P<0.05) than that in the control group. In conclusion, dietary hydrolyzed yeast improved egg production and eggshell quality of laying hens in the late stages of production.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2003.11a
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• pp.109-110
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• 2003

본 시험은 스테비아 부산물의 사료적 가치를 구명하기 위하여 산란계 사료에 첨가하여 산란계의 생산성, 난 품질, 계란의 지방산에 미치는 영향을 고찰하였다. 공시계는 78주령 하이라인 360수로 강제환우후 5％ 산란시기에 시행하여 총 20주 동안 사양시험을 시행하였다. 스테비아 부산물을 산란계 사료에 0, 2, 4, 8 ％를 첨가하여 동일한 에너지(2,800 kcal/kg)와 단백질(16 ％) 수준으로 급여하였으며, 처리구당 5반복, 반복당 18수씩 총 360수를 공시하였다. 시험기간 20주 동안, 총 산란율, 난중, 산란량, 사료요구율은 스테비아 부산물 급여구와 대조구 사이에 유의적인 차이는 없었다. 스테비아 부산물의 급여가 계란의 난 품질에 미치는 영향에서 난각강도, 난각두께, 난백고 및 Haugh Unit는 대조구와 차이가 없었지만, 난황색도는 스테비아 부산물의 급여수준이 증가할수록 높은 수치를 보여 스테비아 4 ％와 8 ％ 급여구는 대조구에 비하여 유의적으로 증가하였다. 계란의 당 전이도 시험에서는 스테비아 부산물을 급여하여 생산된 계란과 대조구 사이에 차이가 없었다. 계란의 지방산 함량은 스테비아 부산물 2 ％와 4 % 급여구가 포화지방산은 감소하였고, 단가 불포화지방산은 유의적으로 증가하였다. 이러한 결과 산란계 사료에서 스테비아 부산물은 원료사료로서 8 ％까지 가능하였다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.283-284
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• 2001

은어(Plecoglossus altivelis)는 우리나라 담수어 중 양식어로서 널리 알려져 있다. 은어는 은빛나는 고기로서 수박향내가 난다하여 아주 맛이 뛰어난 어종으로 알려져 하천어종으로서 중요한 위치를 차지하고 있다. 그러나, 최근 강의 오염이나 강바닥의 변화 등으로 차츰 분포가 축소되고 자원이 줄어들어 연구기관 및 도립 종묘 배양장을 중심으로 인공적으로 대량 종묘생산을 실시하고 있다. (중략)

• Journal of The Korean Society of Grassland and Forage Science
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• v.38 no.4
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• pp.273-279
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• 2018

This experiment was conducted to investigate the effects of individual management and group management of Jeju cross-bred horses on the physiological characteristics, productivity, and characteristics of the loin muscle of the horse meat. Sixteen herds of Jeju cross-bred horses older than 44 months were selected as experimental subjects. The experiment was conducted by dividing the herds into eight herds for individual management and another eight herds for group management. Herds were fed with concentrated feed of 2.5% of the body weight for four times a day and roughage and water were fed ad libitum. In the 12th week, the intestinal pH was statistically significantly lower with group management than with individual management (p<0.05). However, no symptoms of colic were observed. With regard to the general composition of the loin muscle, fat content was a statistically significant difference between the 7.83% with individual management and 5.65% with group management (p<0.05), indicating that individual management is more effective than group management in terms of fattening. In conclusion, feeding a concentrated feed at a level of 2.5% of body weight with individual management during fattening of Jeju cross-bred horses could be utilized as a fattening method.