• 한국축산식품학회지
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• 제28권5호
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• pp.629-636
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• 2008

본 연구는 비육기 이전에 초지에서 방목한 한우육과 옥내에서 비육한 한우육의 품질을 비교하고자 실시하였다. 방목사육구는 $28{\pm}4$개월령 암소 5두를 7개월 동안(4월-11월)방목한 다음 다시 6개월 동안 옥내에서 비육하였으며, 옥내사육구는 6개월령 거세우 10두를 24개월 동안 옥내에서 비육하였다. 시료로 등심(M. longissimus)부위를 채취하여 $4{\pm}0.2^{\circ}C$에서 7일 동안 저장하였다. 도체성적은 방목우의 도체중, 지육율, 배최장근단면적 및 육질등급이 옥내사육우보다 낮았으나(p<0.05), 조직감 및 성숙도는 방목우가 높았다(p<0.05). 조지방 및 n-6 지방산, n-6/n-3은 방목우가 낮았으나(p<0.05), n-3 지방산, 포화지방산은 방목우가 높았다(p<0.05). pH 및 보수력은 방목우가 낮았으며(p<0.05), 전자코에 의한 향기패턴은 두 처리구들간에 뚜렷한 차이를 보였다. 저장중 품질은 방목우의 지방 및 육색소 산화안정성이 낮았으며, 옥내사육 우보다 어둡고 덜 붉은 육색을 나타내었다.

• 한국축산식품학회지
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• 제29권4호
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• pp.409-414
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• 2009

In this study, the quality of chicken breasts from organically reared chickens was compared with that of chicken breasts from conventionally reared chickens. Broilers were raised in an indoor pen with conventional and organic production system, respectively. The diet formulation for the organically reared chickens and the production density were in accordance with the guidelines for organic chicken products. Twenty birds from each group were slaughtered and their breasts were obtained for analysis. The organic chicken breasts had a higher cooking loss, and waterholding capacity, and a lower shear force (p<0.05) compared to the conventional chicken breasts. The organic chicken breasts also showed higher $a^{\ast}$ and $b^{\ast}$ values and myoglobin contents compared with the conventional chicken breasts (p<0.05). In the fatty-acid analysis, the organic chicken breasts resulted in higher polyunsaturated fatty acid (PUFA) and unsaturated fatty acid contents, and a higher PUFA-saturated fatty acid ratio.

• 한국잠사학회:학술대회논문집
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• 한국잠사학회 2002년도 Join Meetings of Korean Society of Sericultural Science and Japanse Society of Sericultural Science
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• pp.140-140
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• 2002

No Abstract, See Full Text

• Parasites, Hosts and Diseases
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• 제21권1호
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• pp.11-18
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• 1983

As a part of observation on the suitability as a second intermediate host of Clonorchis sinensis, various infection experiments were tried to Cyprinus carpio nodus. The results obtained were summarized as follows: 1. The cercariae which attempted to contact with Cyprinus carpio nodus in the water were observed under the stereomicroscope. After contact, cercariae began to separate its tails from the bodies at 4 minutes increasingly, and then the numbers ranged to 80% at 13 minutes after the encounter. But very few cercariae could actually invade into the epidermis of the fish. 2. When Cyprinus carpio nudes were exposed to a number of cercariae in the beaker, only a few cercariae could invade through the epidermis. Most of the invaded cercariae were killed before forming the cyst. Also rare encysted cercariae were found to be dead within 48 hours. 3. Cyprinus carpio nudes were reared with Parafossarulus manchouricus shedding numerous cercariae in the indoor aquarium. When observed after 12 days, to determine the susceptibility, no metacercaria was found infected. 4. Cyprinus carpio nudum were reared with Parafossarulus manchouricus shedding numerous cercariae in Kimhae lake for 2 months in summer of 1982, in order to check the natural infection. No metacercaria of Clonorchis sinensis was found from the fish. 5. In the cases of control fish, Pseudoraibora larva, numerous cercariae were inspected on the course of invasion through epidermis of the fish under the stereomicroscope. And many metacercariae were also found from the Ssh whenever they were kept in beaker, indoor aquarium, or the lake for natural infection. The results suggested that Cyprinus carpio kudus might not be proper intermediate host of Clonorchis sinensis.

• 한국발생생물학회지:발생과생식
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• 제17권2호
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• pp.79-85
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• 2013

To understand the sex reversal characteristics in the longtooth grouper (Epinephelus bruneus), this study examined the sex reversal and artificial masculinization of wild caught E. bruneus reared in indoor rearing tank after a 17${\alpha}$-methyltestosterone injection. To domesticate a broodstock, 64 wild caught E. bruneus, between 47.0 to 110.0 cm in total length and from 1.5 to 21.4 kg in body weight, were reared in indoor rearing tank (4.0 to 5.0 m wide, and 2.5 to 3.0 m depth) for four years. Seven specimens showed sex reversal from female to male during indoor rearing condition, whose total length and body weights were from 63.0 to 99.0 cm and from 4.4 to 13.2 kg, respectively. After inducing artificial masculinization in 14 female E. bruneus with a 17${\alpha}$-methyltestosterone (2.0 mg/kg BW) implants for 3 years, spermiation occurred in 9 specimens (total length: 54.0 to 68.0 cm, body weight: 2.3 to 4.3 kg). Among the female to male sex reversals, two specimens returned back to being female, whose body weights were 2.8 kg (initially 2.6 kg) and 2.7 kg (initially 2.3 kg). Therefore, this study suggested that E. bruneus (> 3.0 kg) was more effective in masculinizing by 17${\alpha}$-methyltestosterone implants.

• 한국잠사곤충학회지
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• 제52권2호
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• pp.96-101
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• 2014

본 연구는 땅강아지의 실내 증식기술 개발을 위해 2년 동안 수행되었다. 2013년 증식수는 $430.{\pm}20.0$ ($mean{\pm}SE$) 개체이었고 충태별로 2 ~ 3령이 $15.3{\pm}25.8$, 3 ~ 5령이 $28.8{\pm}24.0$, 6 ~ 8령이 $2.4{\pm}2.7$개체였다. 2014년의 증식수는 $43.5{\pm}31.0$ ($mean{\pm}SE$)개체이었고 충태별로 2 ~ 3령이 $25.8{\pm}25.6$, 3 ~ 5령이 $23.6{\pm}21.3$, 6 ~ 8령이 $2.9{\pm}2.3$개체였다. 실내사육용기의 증식성공률은 2013년과 2014년에 각각 46.9%와 50.0%로 조사되었다. 야외사육장에 암컷 25개체를 접종하였을 때 총 147개체가 증식되었고 실내 대형사육상에 암컷 100개체와 수컷 50개체를 접종하였을 때 총 78개체가 증식되었다. 야외사육장과 실내 대량사육장에서는 상토를 넣은 25 cm 깊이의 표층에서 전체 유충의 86.4%와 89.7%가 채집되었다.

• 한국양식학회지
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• 제20권2호
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• pp.121-126
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• 2007

밀폐순환 유수식 산소소비 측정장치를 이용하여 해수 및 담수에서 사육한 감성돔, Acanthopagrus schlegeli의 개체수에 따른 산소소비 경향을 조사하였다. 해수 및 담수순화된 평균체중 36.4 g의 감성돔을 각각 1마리와 3마리 그룹으로 나누어 수온(15, 20, $25^{\circ}C$), 광주기(12L:12D)를 달리하여 실험하였다. 모든 실험조건에서 감성돔은 명기동안에 산소소비량이 많고, 암기동안에는 적은 뚜렷한 리듬을 보였으며, 수온상승과 비례하여 산소소비량이 증가하였다. 감성돔의 호흡수는 담수돔 보다 해수돔이 많았으며, 수온상승과 비례하여 증가하였다. 수온 15, 20, $25^{\circ}C$에서 개체수가 1마리일 때 해수돔의 산소소비량은 각각 140.0, 174.8, 282.3 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$, 담수돔은 177.5, 307.8, 413.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$로 해수돔에 비해 담수돔의 산소소비량이 많았다. 그러나 개체수가 3마리일 때는 해수돔 각각 200.5, 274.7, 339.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$, 담수돔 177.5, 307.8, 413.1 mg $O^2{\cdot}kg^{-1}{\cdot}h^{-1}$로 담수돔 보다 해수돔의 산소소비량이 많았다.

• 한국환경독성학회:학술대회논문집
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• 한국환경독성학회 1993년도 제12회 총회 및 학술 발표회 특별강연요지집
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• pp.4-5
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• 1993

Toxicity tests in our laboratory are conducted usually with mass-reared organisms. They are under the same environmentel conditions throughout seasons and are supplied at specific age. A total of 38 species of aquatic organisms are being reared. We have attempted to establish pruified strains or to select clones of various parthenogenic organisms. The merits or demerits of our culturing test organisms are discussed. The differences in the susceptibility among clones or strains of test organism are also discussed. For a single species test, algae, daphnia, fish are often used. However, we usually use early stages, but occasionally, adults fish are used for reproduction tests. As an another important aspect, the toxicity through food chains has been studied. In this study, we select a pair of species belonging different trophic levels. The differences between single species tests and multispecies tests will be discussed. Even a single species test intends to assess the effects of chemicals on ecosystem levels, however, this idea is not applicable to ecosystems. Single species tests with standard organisms and multispecies tests are contradictory in concept. One type of multispecles tests is indoor microcosms being composed of severel species artificially assembled, and another is composed of natural components (both indoor and outdoor). We have used three types of outdoor mesocosms using ponds and three types of artificial streams. The mesocosms is useful to not only to analyze the floral or faun61 changes but also to study the fate or behaviour of chemicals in naturd environments. Lastly, usefulness of the field observation or experiments or semi-field experiments will be discussed. This will enhance the exploitation of early warning systems utilizing indicator organisms or animal behaviour.aviour.

• 한국잠사곤충학회지
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• 제48권2호
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• pp.61-67
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• 2006

천잠의 우량형질 선발을 위하여 실내와 야외에서 사육하면서 수정율, 부화율, 용화율, 전견중 등을 비교 조사하였다. 실내사육 결과, 유충체색에 있어서 강건성은 담록체색이 우수하였으나, 견질은 암록체색이 우수한 것으로 나타났다. 전견중에 따라 분리된 등급간에는 약간의 차이가 인정되었다. 또한 $F_1$ 교잡종은 수정율과 부화율은 원종보다 떨어졌으나, 용화율과 견질 등에서 잡종강세효과가 확인되었으나 $F_2$ 교잡종은 효과가 인정되지 않았다. 야외사육의 경우 실내사육에 비해 감잠비율은 낮으나 유실잠이 많은 경향을 보였다. 또한 전견중, 전층중 및 견층비율 등 견질성적 이 실내사육보다 우수하였다.

• International Journal of Industrial Entomology and Biomaterials
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• 제20권1호
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• pp.19-24
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• 2010

Bumblebees are widely used to pollinate crops in greenhouses and fields. Here, we investigated whether different wake-up treatments during a short period of 1~3 days just before indoor rearing has any effects on oviposition and colony development of $CO_2$-treated Bombus ignitus queens and artificially hibernated B. terrestris queens The wake-up regimes were defined as 16L for 1 day (16L-1), 16 L per day for 3 days (16L-3), 24L for 1 day (24L-1), or 24D for 1 day (24D-1). Among these wake-up treatments, the oviposition rate and preoviposition period of B. ignitus queens reared at 24L-1 were 16.7~25.1% higher and 1.0~3.5 days shorter than other wake-up treatments. B. terrestris queens reared at 24L-1 also showed the best results for egg-laying characteristics, which were 8.9~18.8% higher for oviposition and 0.6~3.5 days shorter for preovipostion period than other wake-up treatments. Furthermore, B. terrestris queens reared at 24L-1 were 17.5% and 13.8% higher in rate of colony foundation and queen production, respectively, than other wake-up treatments. These results show that the most favorable wake-up treatment just before rearing for egg-laying and colony developmental characteristics of B. ignitus and B. terrestris queens was 24L-1. Overall, our findings indicate that a wake-up treatment just before rearing was effective for colony initiation and colony development of bumblebee queens.