• 한국농공학회논문집
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• 제63권1호
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• pp.1-9
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• 2021

Number of duck and its breeding facilities have been steadily decreasing for financial and social issues in Korea. Therefore, the 'turning point' for duck industry is strongly demanded. In this study, the questionary survey was carried out to provide backgrounds for developing policy and technology for duck breeding farms. The questionary survey aimed to investigate the information of operation strategy of farm, ventilation, cooling and heating. The total number of survey respondents was 74. In case of facility type, 55.4% of respondents stated they used greenhouse type, 31.3% for winch-curtain type, and 2.7% for windowless type (mechanically ventilated facility). More than 85% of the facilities were using 'natural ventilation', it meant that these situation can restrict the not only environmental control but also the supply policy for 'smart farm' of the Government. 44.6% used the combination of the cross-ventilation method and roof-ventilation method for ventilation operation in summer season, and 31.1% followed only the cross-ventilation method. In case of winter season, 36.5% used the cross-ventilation method, and 33.3% used the combination of cross and roof-ventilation, method. For the ventilation strategy, about 86.5% depended on farmer's experience. In case of heating and cooling, 79.7% were using kerosene heater for winter season, and 43.2% were using mist-spray for summer season, respectively. More than 75% stated that cooling and heating strategies were based on farmer's experience. From the analyses of the survey results, a few proposals for developing policy and technology for duck breeding farm was suggested.

• 한국육종학회지
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• 제42권4호
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• pp.339-343
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• 2010

Post-translational covalent modifications by small molecules or peptides remodel target proteins. One such modification, made by ubiquitin or small ubiquitin-related modifier (SUMO), is a rapidly expanding field in cell signaling pathways. Ubiquitin attachment controls the turnover and degradation of target proteins while SUMO conjugation regulates their activity and function. Recent studies report many examples of cross-talk between ubiquitin and SUMO pathways, indicating that the boundary is no longer clear. Here, we review recent progress concerning how ubiquitin and SUMO participate in new regulatory roles in plant cell, and how ubiquitination and sumoylation control plant growth and development.

• Journal of Plant Biotechnology
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• 제47권2호
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• pp.107-117
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• 2020

Flower industry is now growing due to the development of economy in many countries. Simultaneously, needs from consumers in flower market are varied widely. To satisfy the needs from consumers and deal with a variety of diseases from a lots of pathogens as well as climate change, new elite flower cultivars should be released in flower market. For this purpose, conventional and biotechnological techniques can be employed to make good cultivar. Therefore, this review describes the general overview of flower breeding techniques including cross-hybridization, mutation breeding and genetic transformation systems. Also, breeding systems for ornamentals derived from plant tissue culture such as embryo culture, in vitro fertilization, ovary/ovule culture and haploid production were reviewed. Furthermore, in this study recent development of the generation of new flower cultivars using marker-assisted breeding, plant transformation including particle bombardment and Agrobacterium tumefaciens as well as genome-editing technology were described. This review will be contributed to the development and releasement of new flower cultivars with horticulturally useful traits in the future.

• 한국자원식물학회지
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• 제3권1호
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• pp.1-30
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• 1990

The traditional plant imprownent methods consisted of pure line selection, cross breeding, heterosis breeding, polyploid breeding, mutati-onbreeding, ect.Biotechmoiogy is divided into gene spliclng , monocle-nal antibodies , protein engineering , agricultural research, and microbiological engineering. Of these , high plants deal with agricultural research, and the importent part of which is tissue culture and celLculture , Tissue .culture and cell culture are again divided into embryoculture, test tube fertilization, anther and pollen culture, somatichybridization , transformation, recombination, recombinant DNA moleculehybrid plasmid, ect For these haploid production, protoplast culture,protoplast fusion, selection and propagation, ect. , the technical sett-lement is needed.

• 한국양식학회지
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• 제12권2호
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• pp.163-165
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• 1999

A production method for scaled and scaleless strain of common carp (Cyprinus carpio) at a breeding trial is developed by test-cross technique. When the fish with scaleless (Israeli strain of common carp) were crossed with scaled strain (hybrid fish between oriental and Israeli strain of the species), we can easily obtain 2 types of common carp with or without scale. The frequency of scaleless fish in this experiment was about 40% in the population, however, their growth rate was slightly higher than scaled fish after 3 months of this experiment.

• International Journal of Industrial Entomology and Biomaterials
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• 제31권2호
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• pp.56-61
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• 2015

Rutin is an important bioflavonoid that is consumed in the daily diet. This study compared the functional components of rutin from various silkworm species using a gene database with those of rutin produced by silkworms selectively bred through cross-combinations. We made comparisons between the geographical origin and species of silkworm using a gene database and discovered that rutin activity was ranked in the following order by species, Chinese (C5)> miscellaneous varieties (Jamsaeng 1 Ho) >Japanese (Jam 115) > European (E58) >Korean (Sun 3 ho). However, rutin levels with respect to various genetic traits (blood color, silk color, and egg color) were consistent. In order to study rutin changes that occurred during the cross breeding of the silkworm gene, we bred cross-combinations utilizing Jam 115 and the 4051 silkworms. In conclusion, in order to provide information about the constituents of functional materials contained in silkworm powder, it is imperative that silkworm cross breeding occurs so that the database of functional materials extracted from silkworms will expand.

• International Journal of Industrial Entomology and Biomaterials
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• 제29권2호
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• pp.162-168
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• 2014

1-Deoxynojirimycin(1-DNJ or DNJ), a component in silkworm powder, prevents glucose from being absorbed into the bloodstream from the small intestine by inhibiting ${\alpha}$-glucosidase activity. This study compared the functional components of 1-DNJ from various silkworm species using a gene database with those of 1-DNJ produced by silkworms bred through cross-combinations. We utilized comparisons of geographical origins and species of silkworms using a gene database and discovered that 1-DNJ activity was ranked in the following order by species, Japanese (SK-1) > Chinese (C48) > European (Rock191). 1-DNJ constituted varying percentages of silkworm organs in the following order, blood > epithelial tissue > body fat > silk glands. With regard to sex, 1-DNJ, levels were higher in males than females. However, 1-DNJ levels with respect to various genetic traits (blood color, silk color, and egg color) were consistent. In order to study 1-DNJ changes that occurred during cross breeding of the silkworm gene, we bred cross-combinations utilizing SK-1 and C48 silkworms. In conclusion, in order to provide information about the constituents of functional materials contained in silkworm powder, it is imperative that silkworm cross breeding occurs so that the database of functional materials extracted from silkworms will expand.

• Asian-Australasian Journal of Animal Sciences
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• 제25권1호
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• pp.52-58
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• 2012

The experiment was conducted under the Department of Animal Breeding and Genetics, Bangladesh Agricultural University (BAU), Mymensingh from June, 2001 to December, 2005 in two different locations (Central Cattle Breeding and Dairy Farm and Bangladesh Livestock Research Institute in Savar, Dhaka) to observe ovarian response to different doses of FSH in three different genotypes of cattle- indigenous Local, Pabna cattle and Friesian${\times}$Local cross. Five different dose levels used were 200, 240, 280, 320 and 360 mg. Ovarian response as corpus luteum (CL), recovered embryo (RE) and of transferable embryos (TE) count in Local were significant for 320, 280 and 280 mg respectively. In Pabna cattle CL, RE and TE count were found significant for 360, 320 and 320 mg respectively. In Friesian${\times}$Local cross CL, RE and TE count were found significant for 360, 320 and 320 mg respectively. The excellent quality embryos showed significantly the highest yield ($1.80{\pm}0.20$) in the 240 and 280 mg FSH levels in Local genotype. In Pabna cattle, the highest yield ($2.00{\pm}0.32$) was found at FSH level 320 mg. In Friesian${\times}$Local, the highest yield ($2.20{\pm}0.20$) was found at FSH level 280 mg.

• Asian-Australasian Journal of Animal Sciences
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• 제26권10호
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• pp.1504-1510
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• 2013

Native chickens hold a significant share of the market in China. In response to the huge demand from the market, the productivity of Chinese native chickens needs to be improved. Cross breeding is an effective method to increase productivity, although it might affect meat quality. In this study, two pure lines (SD02 and SD03) of Erlang mountainous chickens were hybridized with a yellow feather and faster growing line (SD01). The effect of hybridization on carcass and meat quality (physiochemical and textural traits) was measured in the $F_1$ population at d 91 of age. The hybrids exhibited higher body weight and dressed weight, and amount of semi-eviscerated, eviscerated, breast muscle and abdominal fat (p<0.05). Abdominal fat yield also increased (p<0.05) compared to the offspring of the two pure-lines. Meanwhile, there was no significant difference in meat quality traits except for the myofiber diameter and density and the shear force of the breast muscle. Overall, the offspring of cross-lines were similar to pure lines in meat color, pH value, inosinic acid, crude protein, crude fat, dry matter, moisture content and amino acid composition in the breast muscle. These results suggest that productivity can be improved via cross-breeding while maintaining meat quality of the Erlang mountainous chicken.

• 아시안잔디학회지
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• 제22권1호
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• pp.13-24
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• 2008

한국잔디류의 교배조합 계통간 자웅성기관 발육의 차이를 구명하고, 형질의 유전특성을 파악하여, 자연 방임수분 조건에서 타가수분율을 추산하여, 자연방임조건의 교배를 이용한 한국잔디류의 합성품종의 육성 가능성을 확인해 보고자 본 연구를 수행하였다. 한국잔디류 중 형태적으로 특성이 있는 5개 종 및 품종을 사용하여 실험을 수행하였다. 교배조합을 포장에 식재한 후에 암술과 수술의 개화시기를 조사하였으며, 종자를 수확하여 육묘한 후에 후대들의 형태적 특성을 이용하여 형질의 유전특성을 조사하였다. 형태적 특성중 줄기의 기부색을 이용하여 타식률을 조사하였다. 자연방임수분 후대들의 형태적 특성을 이용한 유전특성 비교에서 잎털의 유무, 초장, 분얼경수는 변이의 폭이 크게 나타났고, 엽폭은 종자친의 형질을 많이 따랐으며, 전체적으로는 종자친과 화분친의 영향 없이 한쪽의 모본에서 영향을 받은 형이 가장 많이 나타났다. 모본간의 중간특성을 많이 나타낸 기부색은 각 개체들의 교배여부를 확인할 수 있는 지표로 활용할 수 있었다. 기부색을 이용한 타가수분율 추정은 자웅성기관의 개화시기가 비슷하고 양친의 특성에 차이가 있어 교배를 확인할 수 있는 조합에서 가능하였고, 교배 조합간에 타가수분율에 차이를 보였으나 본 실험에서는 타가수분율이 11.3-48.9(로 추산되어 타식이 발생되는 것을 확인하였고, 한국잔디가 방임수분을 통한 합성품종 육성의 가능성이 있는 것으로 판단되었다.