• 제목/요약/키워드: Rearing System

검색결과 300건 처리시간 0.034초

Effect of different diets on growth and development of the two-spotted cricket, Gryllus bimaculatus (Orthoptera: Gryllidae)

  • Song, Myung-Ha;Han, Moon-Hee;Kwak, Kyu-Won;Lee, Seokhyun;Kim, Eun-Sun;Park, Kwan-Ho;Kim, Won-Tae;Choi, Ji-Young
    • International Journal of Industrial Entomology and Biomaterials
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    • 제33권2호
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    • pp.59-62
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    • 2016
  • Many insects have gained increasing attention as an alternative protein for humans. Among those, the two-spotted cricket, Gryllus bimaculatus (Orthoptera: Gryllidae), was recently approved as a general food ingredient by the Korean Ministry of Food and Drug Safety. For industrial utilization of G. bimaculatus, mass rearing techniques and production system should be standardized first. In this study, we investigated the effects of five different feeds on the growth and development of G. bimaculatus. Feed is the one of the key factors that has considerable effects on rearing insects. With five different kinds of feed on $1^{st}$, $3^{rd}$, and $5^{th}$ instar nymphs, the change of survival rate, body weight were monitored up to eight wk after hatching. We concluded that 50% of soybean flour, 20% of corn powder, 10% of rice bran, 9% of milk serum, 10% of rice flour, 0.5% of microorganisms, and 0.5% of multivitamins and minerals (diet C) was the best mix for promoting growth and development of $3^{rd}$ instar nymphs compared to the control diet.

Effects of Rearing Density on Growth of the Polychaete Rockworm Marphysa sanguinea

  • Parandavar, Hossein;Kim, Kyeong-Hun;Kim, Chang-Hoon
    • Fisheries and Aquatic Sciences
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    • 제18권1호
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    • pp.57-63
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    • 2015
  • Effects of rearing density on growth and survival of the polychaete rockworm Marphysa sanguinea have been investigated in order to develop rearing techniques for this species. This study was examined over a nine-month period in the Fisheries Science and Technology Center of Pukyong National University. Three rockworm densities, 500, 1,000 and $2,000worms{\cdot}m^{-2}$ with weight ranges of < 0.5 g, 0.6-1.5 g, and 1.6-2.5 g, and the no feed control treatment, were stocked in triplicate $0.10m^2$ boxes with sand bottoms. Growth rates were checked with 15 randomly sampled rockworms from each box at months 3, 6 and 9. Results showed that SGRs in all treatments were higher during the first period (0-3 months) than the second (3-6 months) and third periods (6-9 months) for all treatment densities, while SGRs decreased with increasing density. However, survival and growth of worms at high density was not better than low density, but daily biomass production in medium and high density groups was $6.28gm^{-2}day^{-1}$ for the rockworms of 0.6-1.5 g with $2,000inds{\cdot}m^{-2}$, and $12.6gm^{-2}day^{-1}$ for group between 1.6-2.5 g with $2,000inds{\cdot}m^{-2}$, and $14.7gm^{-2}day^{-1}$ for the group of individuals <0.5 g with $1,000inds{\cdot}m^{-2}$. Results showed that M. sanguinea can be one of the most suitable species to commercially exploit in a farming system. In particular, specified densities permit elevated pure production.

먹이 곤충에 따른 Orius strigicollis(Poppius)의 발육과 산란 (Development and oviposition of Orius strigicollis (Poppius) (Hemiptera: Anthocoridae) reared on three different insect preys)

  • 김정환;한만위;이건형;김용헌;이정운;인치종
    • 한국응용곤충학회지
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    • 제36권2호
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    • pp.166-171
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    • 1997
  • 총채벌레류의 유력천적인 Orius strigicollis의 연중 실내사육에 적합한 대체먹이를 선발하고자 먹이 곤충으로 목화진딧물, 점박이응애, 긴털가루응애를 각각 급여하여 O. strigicollis의 발육과 산란수를 $25\pm$$1^{\circ}C$, RH60-80%, 16L:8D 조건에서 조사하였다. 약충기간 중 생존율과 발육기간은 목화진딧물 급여시 81.6%와 11.6일, 점박이응애 급여시 56.7%와 14.6일, 긴털가루응애 급여시 42.3%와 16.5일 이었으며, 성충기간 중 총산란수는 목화진딧물 급여시 68.5개, 점박이응애 급여시 46.1개, 긴털가루응애 급여시 26.5개로 3종의 먹이곤충 중 목화진딧물 급여가 가장 좋은 것으로 나타났다.

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동충하초 자원의 효율적 이용에 관한 고찰 (Study on the Efficient Utilization of Entomopathogenic Fungi, Cordyceps Species)

  • 남성희;정이연;홍인표;지상덕;박해철;이진근;이명렬;장승종
    • 한국잠사곤충학회지
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    • 제46권1호
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    • pp.18-22
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    • 2004
  • 본 연구에서는 동충하초 연구정보 구축 및 정보이용을 위한 효율성을 제고를 목적으로 Paecilomyces tenuipes 재배관리 요소와 Cordyceps 종의 특성분석에서 요구되는 주요 요소를 설정, 표준화하고자 하였다. 결과 Paecilomyces tenuipes 재배관리에 요구되는 주요 요소는 재배일정에 따라 누에사육과정, 버섯재배과정, 관리과정의 3항목으로 구분하였다. 누에사육 및 버섯재배과정은 3개 하부항목으로 세분하여 온도, 습도 경과일수를 조사하였다. 기타 항목으로는 사육도구, 소요장비 등이다. 동충하초 종별 특성조사 요소로는 일반적 균 특성과 분류학적 균 특성을 중심으로 14 Item, 41 Division으로 구분하였는데, 14 Item은 일반사항, 기주, 자낭각, 분생포자 등 구조물에 따라 구분하였으며, 14 Item에 관한 크기, 색상 등에 따라 41 Division으로 세분하였다.

Oviposition Activity of Black Soldier fly (Hermetia illucens) under Artificial Illumination

  • Park, Kwan-Ho;Han, Moon-Hee;Lee, Seokhyun;Kim, Eun-Sun;Song, Myung-Ha;Kim, Won-Tae;Choi, Ji-Young;Kim, Hong Geun
    • International Journal of Industrial Entomology and Biomaterials
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    • 제35권2호
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    • pp.100-105
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    • 2017
  • Under natural conditions, black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae), colonizes in warm temperate regions, and is active in Korea from May through October. Information on black soldier fly rearing, which is affected by seasonal factors in Korea, is limited. Oviposition by black soldier flies is dependent on light intensity and wavelength. Therefore, continuous mass rearing of this fly requires determination of optimal artificial conditions of illumination. In this study, we compared the number of eggs laid under an artificial light source (750 watt HPL lamp) versus nature sunlight. Our results showed that compared to oviposition under natural sunlight, the use of one or two lamps for 7 hours, resulted in only 43 and 76%, of the total number of eggs laid under natural sunlight, respectively. We also investigated the hatchability of oviposited eggs under artificial illumination and under natural sunlight. The hatching rate under the former was much significantly lower than under the latter. Further detailed research is required to develop methods for successful mass rearing of black soldier fly throughout the year by means of an indoor system.

순환여과식과 유수식 사육시스템에 의한 해산어류 종묘생산 비교 (Comparison on Seedling Production of Marine Fishes between Recirculating and Running Seawater System)

  • 장영진;고창순;양한섭
    • 한국양식학회지
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    • 제8권2호
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    • pp.117-131
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    • 1995
  • 현행의 해산어류 종묘생산 방법을 개량하여 보다 효율적인 종묘의 사육방법을 개발하고자, 감성돔과 황점볼락의 자어를 재료로 각각 여름과 겨울에 있어 순환여과식과 유수식 사육시스템에 의한 사육실험을 실시하고, 사육수의 수질환경 및 어체의 성장과 생존율을 비교하였다. 1 감성돔 순환여과식 사육시스템의 수온은 기온에 따라 변화하는 경향을 보였고, 유수식보다 평균 $1.4^{\circ}C$ 높은 $23.6\~26.4^{\circ}C$의 범위를 나타냈다 순환여과식 사육시스템에서의 비중은 $1.0252\~l.0266$의 범위로 비교적 안정되었으나, 유수식에서는 그 변화폭이 컷다. 사육수의 pH는 유수식 사육시스템에서 자연해수와 비슷한 변화를 보인 반면, 순환여과식에서는 7.51까지 낮아졌다. 사육수의 $NH_4-N,\;NO_2-N,\;NO_3-N$$PO_4-P$의 양은 순환여과식에서 애우 높았고, $NO_2-N$$NO_3-N$은 각각 3.623 ppm, 7.207 ppm까지 상승하였다. 순환여과식과 유수식 사육시스템간에 있어 어체의 전장, 체고 및 체중의 성장에는 유의한 차이를 인정할 수 없었다. 두 시스템의 어체 생존을은 F4 $71.2\%,\;F8\;66.2\%,\;R4\;16.2\%$, 그리고 R8 $5.5\%$의 순으로, 순환여과식 사육시스템에서 높았다. 2. 황점볼락 순환여과식 사육시스템에서의 수온은 유수식보다 평균 $1.5^{\circ}C$ 높은 $9.8\~14.6^{\circ}C$의 범위였다. 비중은 두 시스템에서 $1.0253\~l.0270$의 범위로 안정되었으나, 순환여과식 사육시스템에서 약간 높은 분포를 보였다. pH는 두 시스템에서 자연해수에 가까운 $7.96\~8.64$ 범위로 유지되었으나, 순환여과식 사육시스템에서 다소 낮아지는 경향이었다. 순환여과식에서의 $NO_2-N$$NO_3-N$ 양은 각각 0.433ppm, 2.333 ppm까지 높아져 유수식에 비해 높은 편이었으나, $NH_4-N$ 양은 오히려 낮았다. 순환여과식 사육시스템에서 어체의 전장 및 체중의 성장은 유수식에 비해 유의하게 빨랐으나, 체고의 성장에는 유의차가 없었다. 두 시스템의 어체 생존율은 $F4\;67.6\%$$R4\;73.6\%$로 나타나, 서로 비슷하였다.

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순환여과식 양식 시스템에서 나일 틸라피아(Oreochromis niloticus)의 사육 (Culture of Nile Tilapia (Oreochromis niloticus) in Recirculating Aquaculture System)

  • 서근학;김병진;조재윤
    • 한국수산과학회지
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    • 제35권1호
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    • pp.27-34
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    • 2002
  • Package 형태로 설계하고 제작된 pilot scale 순환 여과식 양식 시스템의 실제 어류 사육 성능을 판단하고자 하였다. 틸라피아를 설계 기준인 $5\%$ (A, B)의 사육 밀도에서 30일간 사육하였고 $7\%$ (C)의 과잉 사육밀도에서 33일간 사육하여 어류 성장과 사육조의 각종 수질을 측정하고 시스템의 안정성을 검토하였다. 실험 결과 초기 사육 밀도 $5\%$인 실험 A와 B, $7\%$의 사육밀도인 실험 C에서 각각 1.62, 1.79, 1.80의 사료계수와 $0.452\%$, $0.445\%$, $0.423\%$의 일간 성장률을 보였다. 총 암모니아성 질소의 농도는 설계 기준 사육밀도인 $5\%$로 수용한 실험 A와 B의 경우, $1g/m^3$ 이하로 유지하여 어류 사육에 적합한 것으로 나타났으며 $7\%$로 수용한 실험 C에서는 $2{\~}4g/m^{3}$의 농도를 나타내어 최대 $40\%$ 정도는 초과 수용할 수 있는 것으로 나타났다. 알칼리도의 부족은 질산화 반응을 저해하여 높은 암모니아 및 아질산성 질소의 농도를 유발하였으며 질산화 반응기의 숙성이 완전하지 않을 경우 아질산의 농도가 암모니아 농도와 유사하게 나타났다. 질산화 반응기의 완전한 숙성은 70일 정도 소요되었다. 시스템 내부에서 자연적인 탈질반응이 일부 발생하였고 이와 더불어 보충수의 공급에 따른 희석효과로 설계 사육 밀도보다 높은 $7\%$의 사육 밀도에서도 $60g/m^3$ 이하의 질산성 질소 농도를 유지할 수 있어 별도의 탈질 장치는 필요하지 않은 것으로 나타났다. 수처리 장치를 통과하지 않고 사육조 수면으로 공급되는 우회량이 많을 경우 용존산소는 증가하였으나 수처리 장치로 공급되는 유량이 작아 부유 고형물, 유기물 등의 수질 인자가 악화되는 현상을 보였다.

우리나라 어머니의 자녀 양육의 의미 - 거제지역을 대상으로 - (An Ethnography of Child-Rearing Experiences of Korean Mothers Living on Koje Island)

  • 이수연
    • 여성건강간호학회지
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    • 제7권4호
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    • pp.518-535
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    • 2001
  • Nursing practices should be based on the understanding of human beings. In order to understand human beings, it is important to study the lifestyles and thoughts of people in their natural environment. In this sense, the cultural aspects of a society need to be studied for a culture-bound nursing service. Child care, which is an important element of nursing, is also strongly influenced by the culture of a society. Therefore, a cultural study is necessary to understand the child-rearing practices of any society. The major purpose of this dissertation is to provide basic foundations for developing a culture-based theory for nursing intervention through studying traditional cultural elements of child care in Korean society. The study examined child-rearing practices in a small village on Koje Island in the southern part of Korea. It utilized ethnographic methodologies including participatory observations and in-depth interviews. The study participants were 9 Korean mothers living on Koje Island. The average age was 52. The data were collected between July in 1998 and December in 1999. The average number of interviews per person was 7-8, and the duration of each interview was approximately 2 hours. The data were analyzed using the Spradley Analytical Method. The following 9 major child-rearing aspects of mothers on Koje Island were discovered as a result of the study: 1. Firstly, mothers on Koje Island were mostly concerned about the "Old Birth Goddess' Curse", especially during their child's early years. This concern was evidenced by their careful behavior when their child was very young and by their praying to the Old Birth Goddess not to be jealous of their babies. 2. Secondly, they wished their children to live a different and better life than themselves. It was represented by their strong motivation toward their children's education as well as their expectation for their children's success. In traditional Korean culture, Korean people think that the rise and fall of the household depend on their offsprings. Therefore, Korean mothers wish their children attain to a higher level of social status through education. 3. Third, mothers are concerned about their children's righteousness. Mothers on Koje island expect their children to live with discretion, justice, strength, respect, harmony, and to do their best in life. 4. Next was an 'anticipation of their children's happy marriage'. The attributes of this category were an 'anxiety about their children's married life', and 'an expectation of a good spouse for their children'. Because Korean people believe that only a son can continue the bloodline of a family, especially Korean mothers have a great concern of the possibility of their daughters not having a son after marriage. Also they have different expectations toward their daughter-in-laws than son-in-laws. 5. Korean mothers also derived their satisfaction from their son. It was characterized by 'excessive affection toward their son', 'dependency on their son', and 'being afraid of their married daughter having a girl like themselves'. Korean society has been a patriarchy. Therefore, a son is beloved as someone who will take care of his old parents, be in charge of ancestral rites, and provide a daughter-in-law who can conceive a son. 6. The sixth category concerned 'the differences in their expectations for their children'. The attributes in this category were 'different expectations depending on their children's gender', 'different expectations depending on their children's ability', and a 'great sympathy toward children with low abilities'. Korean mothers expect their son to become better than their daughter. 7. The seventh category was related to their 'roles in child-caring practices'. Traditionally a child was raised in an extended family system in Korea So it was not the sole duty of a mother to bring up the child. Korean mothers used to receive much help rasing children from their in-laws, and family members. On the other hand, many children grew up by themselves, because their mothers were very busy taking care of housework. Furthermore, many children also grew up in poverty. 8. Mothers also had issues related to 'conflicts in child rearing'. They were characterized by 'lack of understanding', 'rudeness of children', and 'giving vent to one's anger'. 9. Finally, mothers regretted not doing their best in child-rearing practices. It was characterized by a 'bitter feeling of repentance', 'feeling irritated', and 'feeling of unsatisfaction'.

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Effect of single-sex or mixed rearing on growth and laying performance, blood parameters, egg quality, and feather scores of laying hens in an aviary system

  • Jiseon Son;Hee-Jin Kim;Eui-Chul Hong;Hyun-Soo Kim;Jin-Joo Jeon;Bo-Seok Kang;Hwan-Ku Kang
    • 농업과학연구
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    • 제49권1호
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    • pp.19-29
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    • 2022
  • The present experiment was conducted to evaluate the effects of single-sex or mixed rearing on the growth and laying performance, blood parameters, egg quality, and feather scores of laying hens in an aviary system. A total of 2,928 (females, 2,856; males, 72), Hy-Line Brown chickens at 20 weeks were evenly assigned to two treatments: termed here the single-sex (only female) and mixed-sex (female to male 20 : 1) conditions. They were allowed an ad libitum diet for 20 weeks in an aviary system. There were eight replicates of each treatment, each consisting of 12.42 m2·birds-1 (n=183), respectively. The body weight and uniformity in the mixed-sex condition were higher than those in the single-sex condition, but egg production did not show any significant differences between the two types of treatment for 20 weeks. The mixed-sex group showed an effect through stress parameters (corticosterone), whereas the feather score on the back was low at the end of the experiment. These results suggest that the presence of males affect corticosterone level for mating but can reduce the vigilance and aggressive behavior of laying hens.

취업모의 성격특성과 자녀 양육스트레스와의 관계 (The Relationship between Personality and Child Rearing Stress of Employed Mothers)

  • 김선희;박정윤
    • 대한가정학회지
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    • 제50권8호
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    • pp.41-52
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    • 2012
  • The purpose of the current study is to examine the role of mothers' personality traits in predicting their parenting stress. The study subjects were married working woman who live at Gyeonggi-do and has their first child studying in elementary, middle, or high school. Collected data were analyzed with SPSS WIN 18.0 program. The results were as follows.: First, it has been shown through examination of the general tendency of observation subjects' relative factor, that many have above average parenting stress. The compositing factor for parenting stress were mainly the burden and distress of the parent role. Second, the differences in parenting stress were affected by relative variables in accordance with the general features of the study object. If the younger the parent, the higher the education, the lower the age of the first child, and if there were a child assistant after school, the parenting stress became larger. Third, after controlling for demographic characteristics, employed mothers' neuroticism significantly predicted greater parenting stress. When mothers had more conscientiousness and openness, they reported less parenting stress which implied that interpretation and perception of child rearing experiences can vary depending on personality and predict parenting stress of working mothers.