A Study on the Effects of Meterological Factors on the Distribution of Agricultural Products: Focused on the Distribution of Chinese Cabbages (기상요인이 농산물 유통에 미치는 영향에 관한 연구: 배추 유통 사례를 중심으로)
- Lee, Hyunjoung;Hong, Jinhwan
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- Journal of Distribution Research
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- v.17 no.5
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- pp.59-83
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- 2012
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Agriculture is a primary industry that influenced by the weather or meterological factors more than other industry. Global warming and worldwide climate changes, and unusual weather phenomena are fatal in agricultural industry and human life. Therefore, many previous studies have been made to find the relationship between weather and the productivity of agriculture. Meterological factors also influence on the distribution of agricultural product. For example, price of agricultural product is determined in the market, and also influenced by the weather of the market. However, there is only a few study was made to find this link. The objective of this study is to investigate the effects of meterological factors on the distribution of agricultural products, focusing on the distribution of chinese cabbages. Chinese cabbage is a main ingredient of Kimchi, and basic essential vegetable in Korean dinner table. However, the production of chinese cabbages is influenced by weather and very fluctuating so that the variation of its price is so unstable. Therefore, both consumers and farmers do not feel comfortable at the unstable price of chinese cabbages. In this study, we analyze the real transaction data of chinese cabbage in wholesale markets and meterological factors depending on the variety and geography. We collect and analyze data of meterological factors such as temperatures, humidity, cloudiness, rainfall, snowfall, wind speed, insolation, sunshine duration in producing and consuming region of chinese cabbages. The result of this study shows that the meterological factors such as temperature and humidity significantly influence on the volume and price of chinese cabbage transaction in wholesale market. Especially, the weather of consuming region has greater correlation effects on transaction than that of producing region in all types of chinese cabbages. Among the whole agricultural lifecycle of chinese cabbages, 'seeding - harvest - shipment - wholesale', meterological factors such as temperature and rainfall in shipment and wholesale period are significantly correlated with transaction volume and price of crops. Based on the result of correlation analysis, we make a regression analysis to verify the meterological factors' effects on the volume and price of chines cabbage transaction in wholesale market. The results of stepwise regression analysis are shown in
and
. The type of chinese cabbages are categorized by 5 types, i.e. alpine, gimjang for winter, spring, summer, and winter crop, and all of the regression models are shown significant relationship. In addition, meterological factors in shipment and wholesale period are entered more in regression model than those in seeding and harvest period. This result implies that weather in consuming region is also important in the distribution of chinese cabbages. Based on the result of this study, we find several implications and recommendations for policy makers of agricultural product distribution. The goal of agricultural product distribution policy is to insure proper price and production cost for farmers and provide proper price and quality, and stable supply for consumers. Therefore, coping with the uncertainty of weather is very essential to make a fruitful effect of the policy. In reality, very big part of consumer price of chinese cabbage is made up of the margin of intermediaries, because they take the risk. In addition, policy makers make efforts for farmers to utilize AWIS (Agricultural Weather Information System). In order to do that, it should integrate the relevant information including distribution and marketing as well as production. Offering a consulting service to farmers about weather management is also expected to be a good option in agriculture and weather industry. Reflecting on the result of this study, the distribution authorities can offer the guideline for the timing and volume of harvest, and it is expected to contribute to the stable equilibrium of supply and demand of agricultural products.
Variation of Soil Physical Characteristics by Drainage Improvement in Poorly Drained Sloping Paddy Field (배수불량 경사지 논 토양의 배수방법에 따른 토양 물리성 변화)
- Jung, Ki-Yuol;Yun, Eul-Soo;Park, Chang-Young;Hwang, Jae-Bok;Choi, Young-Dae;Jeon, Seung-Ho;Lee, Hwang-A
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- Korean Journal of Soil Science and Fertilizer
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- v.45 no.5
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- pp.704-710
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- 2012
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The lower portion of sloping paddy fields normally contains excessive moisture and the higher water table caused by the inflow of ground water from the upper part of the field resulting in non-uniform water content distribution. Four drainage methods namely Open Ditch, Vinyl Barrier, Pipe Drainage and Tube Bundle for multiple land use were installed within 1-m position from the lower edge of the upper embankment of sloping alluvial paddy fields. This study was conducted to evaluate soil physical characteristics by drainage improvement in poorly drained sloping paddy field. The results showed that subsurface drainage by Pipe Drainage improves the productivity of poorly drained soils by lowering the water table and improving root zone soil layer condition. In an Pipe drainage plot, soil moisture drained faster as compared to the other drainage methods. Infiltration rate showed high tendency to Piper Drainage method about
$20.87mm\;hr^{-1}$ than in Open Ditch method$0.15mm\;hr^{-1}$ . And Similarly soil water and degree of hardness and shear strength phase of soil profile showed a tendency to decrease. From the above results, we found that when an subsurface drainage was established with at 1m position from the lower edge paddy levee of the upper field in sloping poorly drained paddy fields Pipe Drainage was the most effective drainage system for multiple land use.
Studies on the Mucilage of the Root of Abelmoschus manihot, MEDIC -[Part I] Viscosity and Free Sugars in the Mucilage- (황촉규근(黃蜀葵根) 점액(粘液)에 관(關)한 연구(硏究) -[제1보(第一報)] 점액(粘液)의 점성(粘性) 및 유리당(遊離糖)-)
- On, Doo-Heayn;Im, Jei-Bin;Sohn, Joo-Hwan
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- Applied Biological Chemistry
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- v.19 no.1
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- pp.36-40
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- 1976
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The mucilage of the root of Abelmoschus manihot, MEDIC is important for production of Korean traditional hand-made paper. This study was proceeded to detect the variation of the amount of free reducing sugars and of the viscosity in the mucilage. The results as follow. 1. The mucilage of the root of Abelmoschus manihot, MEDIC has contained some of free reducing sugars, 2. The viscosity of the mucilage isolated from the root decreases with time at the constant temperature, but the amount of reducing sugars show a little change. 3. The amount of the reducing sugars is not changed on the agitation. 4. When
$1{\sim}2%$ ammonium sulfate solution is added, the viscosity of the mucilage decreases very gradually, and the amount of the free reducing sugars in the mucilage shows a little change.
Effect of Algal Fraction to Particulate Organic Matter in the Upper Regions of a Brackish Lake Sihwa (시화호 상류 기수역에서 입자성유기물에 대한 조류영향)
- Choi, Kwangsoon;Kim, Sea-Won;Kim, Dong-Sub;Heo, Woomyoung
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- Korean Journal of Ecology and Environment
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- v.46 no.4
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- pp.499-506
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- 2013
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To estimate the effect of algae to particulate organic matter in the upper regions of brackish Lake Sihwa, temporal and spatial variations of particulate organic carbon (POC) and phytoplankton pigments (chlorophyll a; Chl-a, pheophytin-a; Pheo-a), and their relationships were studied at seven sites of the brackish regions from March to October 2005 and 2006. POC concentration varied from 1.0 to
$76.6mgL^{-1}$ (mean$7.4mgL^{-1}$ ), with maximal concentrations occurring in the middle parts of the study area in spring of 2005 and 2006. Concentrations of Chl-a and Pheo-a varied from 1.3 to$942.9{\mu}gL^{-1}$ (mean$71.0{\mu}gL^{-1}$ ) and$1.4{\sim}1,545.5{\mu}gL^{-1}$ (mean$59.9{\mu}gL^{-1}$ ), respectively, and corresponded closely with variation in POC. During the study period Pheo-a concentration was 44.2% of total Chl-a, implying that non-living or inactive phytoplankton is also the important part of phytoplankton-derived POC in brackish regions of Lake Sihwa. From the positive linear relationships between POC and phytoplankton pigments (POC with Chl-a (r=0.93), total Chl-a (r=0.88), and Pheo-a (r=0.81)), it is suggested that phytoplankton was a significant component of POC in the upper regions of brackish Lake Sihwa. On the other hand, the ratios of POC/Chl-a and POC/total Chl-a (Chl-a+Pheo-a) were 82.9 and 35.9, respectively. The ratio of POC/total Chl-a is similar to those reported in previous studies, including 40~60 in estuaries. This study suggests that Pheo-a concentration is considered in estimation of POC concentration from phytoplankton pigments in aquatic systems with high content of Pheo-a, like an upper region of blackish Lake Sihwa.
Measurement of Leaf Area of Soybeans (대두엽면적의 간이측정법)
- Kwon-Yawl Chang
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- KOREAN JOURNAL OF CROP SCIENCE
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- v.4 no.1
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- pp.93-95
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- 1968
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The importance of leaf area as related to transpiration and photosynthesis is generally recognized. In general, a compound leaf of soybean consist of one main leaflet and two side leaflets from each node of the stem. Takahashi and Fukuyama (1919) classified soybeans into three types, namely the long leaf type, round leaf type, and intermediate type, in which the last one had round leaves at the base and long leaves in the upper part of the stem. Nagai (1925) and Takahashi (1935). dealt with the genetics of the leaf form and association with other characters. The closely relationships, the correlation coefficients from 0.64 to 0.73, were shown between the leaf area and the soybean yield in the experiments by Nagai (1942). Nagata (1950) also tested the varietal differences of the variation of leaf length and its ratio to the leaf width on the nodes of stem, and finally divided varieties into five types. Three methods of measuring area of strawberry leaves were used by Darrow (1932). The first involved determining a factor to be used with length or length
${\times}$ width measurements. The second method involved placing leaves on pieces of cardboard of known area cut to the shape of the leaves. Direct use of the planimeter on intact leaves was Darrow's third method. Miller (1938) enumerated several methods to determine the leaf surface area in plants, some of which were extremely laborious and required removing leaves from plants. They included tracing outlines of leaves on paper and measuring the enclosed area with a planimeter or cutting out the traced areas and comparing the weights obtained with the weight of a known paper. Another method involved placing the form of the leaf on sensitized paper with the area being determined by measuring or weighing as above. Miller further stated that the photoelectric cell can also be utilized to estitmate leaf area. Working with field beans, Davis (1940) found that 0.004517 (length${\times}$ width) of the center leaflet was the most nearly accurate of four methods attempted. A simple procedure to measure leaf area in corn was devised 1 y Montgomery (1911) and used by Kiesselbach (1950). The formula was length${\times}$ width${\times}$ 0.75. Stickler et al. (1961) have successfully used length times width${\times}$ 0.747 to estimate area of grain sorghum leaves. Bhan and Pande(1966) has also used length${\times}$ width${\times}$ 0.802 to determine leaf area of rice varieties. The main objectives of the present investigation were to develop an accurate, rapid method to determine leaf area in soybean varieties and to examine certain data associated with leaf area determinations.
Structural and Compositional Characteristics of Skarn Zinc-Lead Deposits in the Yeonhwa-Ulchin Mining District, Southeastern Taebaegsan Region, Korea Part I: The Yeonhwa I Mine
- Yun, Suckew
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- Economic and Environmental Geology
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- v.12 no.2
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- pp.51-73
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- 1979
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The zinc-lead deposits at the Yeonhwa I mine were investigated in terms of ore-forming geologic setting, structural style of ore control, geometry of individual orebodies, zoning, paragenesis and chemical composition of skarn minerals, as well as metal grades and ratios of selected orebodies. The Yeonhwa I mine is characterized by a large swarm of chimney type massive orebodies with thin skarn envelopes, boldly developed through a thick sequence of Pungchon Limestone, the overlying Hwajeol Formation, and the underlying Myobong Slate of Cambrian age. Nearly 20 orebodies of similar shape, but of varying size are arranged in a V-shaped pattern with northwest and northeast trends, clearly indicating an outstanding ore control by a conjugate system of fractures with these trends. Important orebodies are the Wolam 1, 2, 3, and 5 orebodies in the west, and the Namsan 1, 2, 3. and 5 orebodies in the east, among others. The Wolam 1 orebody, which was observed from the -360 level through the -240, -120, and 0 levels to the surface outcrops (totaling a vertical height of about 500m), shows a vertical variation in skarn mineralogy, ranging from pyroxene-garnet zone on the lower levels. through pyroxene (without garnet) zone on the intermediate levels, and finally to rhodochrosite vein on the upper levels and surface. Microprobe analyses of pyroxene and garnet on a total of 14 mineral grains revealed that pyroxenes are manganoan salitic in most samples, with downward increase of Fe and Mn, whereas garnets are highly andraditic, containing fractions of subordinate grossular with downward decrease of Fe. This indicates a reverse relationship of Fe-contents between pyroxene and garnet with depth. Ore minerals are major sphalerite, subordinate galena, and minor chalcopyrite. Sulfide gangue minerals include major pyrrhotite, and minor pyrite and marcasite of later age. Two types of variational trends in metal grades and ratios with depth are present on the plots of assay data from the Wolam orebodies: one is a steady upward increase in Pb, Zn, and Pb:Zn ratios, with a terminal decline at the top of orebody: the other is an irregular or sinusoidal change. The former is characteristic of chimney-type orebodies, whereas the latter is of vein· shaped orebodies. The Pb grades show large variations among orebodies and from level to level, whereas the Zn grades are relatively constand or less variable.
Development and Application of Multi-Functional Floating Wetland Island for Improving Water Quality (수질정화를 위한 다기능 인공식물섬의 개발과 적용)
- Yoon, Younghan;Lim, Hyun Man;Kim, Weon Jae;Jung, Jin Hong;Park, Jae-Roh
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- Ecology and Resilient Infrastructure
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- v.3 no.4
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- pp.221-230
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- 2016
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Multi-functional floating wetland island (mFWI) was developed in order to prevent algal bloom and to improve water quality through several unit purification processes. A test bed was applied in the stagnant watershed in an urban area, from the summer to the winter season. For the advanced treatment, an artificial phosphorus adsorption/filtration medium was applied with micro-bubble generation, as well as water plants for nutrient removal. It appeared that the efficiency of chemical oxygen demand (COD) and total phosphorus (T-P) removal was higher in the warmer season (40.9%, 45.7%) than in the winter (15.9%, 20.0%), and the removal performance (suspended solid, chlorophyll a) in each process differs according to seasonal variation; micro-bubble performed better (33.1%, 39.2%) in the summer, and the P adsorption/filtration and water plants performed better (76.5%, 59.5%) in the winter season. From the results, it was understood that the mFWI performance was dependent upon the pollutant loads in different seasons and unit processes, and thus it requires continuous monitoring under various conditions to evaluate the functions. In addition, micro-bubbles helped prevent the formation of anaerobic zones in the lower part of the floating wetland. This resulted in the water circulation to form a new healthy aquatic ecosystem in the surrounding environment, which confirmed the positive influence of mFWI.
Hospice Education among Hospice Professionals and Its Regional Variations in Korea -Outcomes from a 2008 Hospice Palliative Care Institutions Support Project- (한국 호스피스.완화의료 전문인력 교육의 지역적 변이 -2008년 말기 암환자 전문기관 활성화 지원사업 신청기관 인력을 중심으로-)
- Kang, Jin-A;Shin, Dong-Wook;Hwang, Eun-Joo;Kim, Hyo-Young;Ahn, Seong-Hoo;Yoo, Yang-Sook
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- Journal of Hospice and Palliative Care
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- v.12 no.3
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- pp.132-138
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- 2009
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Proper education of hospice professionals is essential for ensuring quality of end-of-life care. In 2005, 'End-of-life Care Task Force Team' by Ministry of Health and Welfare established '60 hours of hospice education' as basic requirement for hospice professionals. This study is aimed to determine how many of the hospice professionals meet with the criteria and whether there are significant regional variations. Methods: We analyzed the data from 46 hospice organizations, which submitted the application to the 2008 designation program of Ministry of Health, Welfare, and Family Affairs. Data included details of the educational records of each hospice professionals. Results: Total 673 hospice professionals were included in the analysis. Overall, only 41.5% (279/673) met the requirement. Nurses (46.8%; 177/378) were more likely to meet the requirement than doctors (35.8%; 38/106), social workers (32.0%; 24/75) and clergies (35.1%; 40/114). Hospice professionals of the organizations in metropolitan area received more education than those in small cities or rural area (52.4% vs. 25.0% for doctors, 50.6% vs. 43.9% for nurses, 42.9% vs. 25.5% for social workers). By geographic areas, hospice professionals in southeast regions received less education than other part of Korea (28.1% vs. 43.0
${\sim}$ 48.8%, respectively). Conclusion: Less than half of the Korean hospice professionals has received proper amount of hospice education, and significant regional variations existed. National programs to promote the education of hospice professionals and eliminate its disparities are greatly warranted. Implementation of the 60-hour currirulum for hospice professionals, based on the train-the-trainer model, would be regarded as one potential solution.
Geochemical Variation of Authigenic Glauconite from Continental Shelf of the Yellow Sea, off the SW Korea (한반도 남서부, 황해 대륙붕에서 자생하는 해록석의 지구화학적 변화)
- Lee, Chan Hee;Lee, Sung-Rock;Lee, Chi-Won;Choi, Suck-Won
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- Economic and Environmental Geology
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- v.30 no.4
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- pp.303-312
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- 1997
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The massive, fractured and porous-type of glauconite, which is subdivided by surface morphology, occur in subtidal sand and semiconsolidated intertidal sand/mud from continental shelf of the southeastern Yellow Sea. This area is presumed to be a part of Holocene transgressive tidal systems tract. The glauconite, pellet-like grains with diameter of 0.1 to 1 mm, is scattered in surface sand sediments. Results of X-ray diffraction data of the minerals are monoclinic with
$a=5.242{\AA}$ ,$b=9.059{\AA}$ ,$c=10.163{\AA}$ ,${\beta}=100.5^{\circ}$ ,$V=474.53{\AA}^3$ . Thermal treatments on the oriented glauconite increase the X-ray diffraction intensity near$10{\AA}$ (001), suggesting the presence of some expandable layers. Specific gravity of the glauconite is$2.60{\pm}0.45gm/cc$ on the basis of chemical composition and unit-cell dimensions. Based on$O_{10}(OH)_2$ , chemical composition of glauconites, octahedral Fe content ranges from 1.19 to 2.06 atoms, corresponding octahedral AI is 0.18 to 0.76 atoms, which progressively substitute Fe for AI with increasing from porous to massive-type. The Mg content ranges from 0.35 to 0.54 atoms, and shows higher with increasing Al contents. A systematic increase of interlayer K from 0.34 to 0.71 is also observed with apparent increases from porous to massive-type, and related to a proportion of expandable layers. The clay preserved in glauconite, which is recognized as ordered/disordered (massive to fractured-type). The interstratified illite/smectite (porous-type), contains 7 to 27 % expandable layers. The glauconite seems to originate from post depositional authigenic growth in reducing environments promoted by the dissolution of clay minerals and biogenic debris.
Genetic Variation and Population Specific Mitochondrial DNA Haplotype Found in the Jeju Native Pig Population (제주재래돼지 집단서 집단특이적 mtDNA Haplotype과 유전적 다양성)
- Han, S.H.;Cho, I.C.;Lee, C.E.;Lee, S.S.;Kang, S.Y.;Choi, Y.L.;Oh, W.Y.;Sung, P.N.;Ko, S.B.;Oh, M.Y.;Ko, M.S.
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- Journal of Animal Science and Technology
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- v.46 no.6
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- pp.917-924
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- 2004
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Using PCR-RFLP haplotyping for the mitochondrial DNA(mtDNA) fragment containing the NADH dehydrogenase 2 gene(ND2) and three tRNA genes(tRNA-Met, tRNA-Trp and tRNA-Ala), we characterized the genetic diversity of five pig breeds including Jeju native pigs. mtDNA polymorphisms showing distinct cleavage patterns were found in the pig breeds. Two digestion patterns were detected when HaeIII- and Hinfl-RFLP, and four in the Tsp5091-RFLP analyses. Combining the three restriction enzyme digestion patterns found in five different pig breeds, four mtDNA haplotypes were observed and the haplotype frequencies were significantly different by the pig breeds. A monomorphic haplotype, mtWB, was observed in both Korean wild boars and Large White pigs. Both Duroc and Landrace pigs contained two haplotypes suggesting their multiple maternal lineages. Jeju native pig has two haplotypes(mtJN and mtJD). Of these, mtJN is identified as a Jeju native pig specific haplotype. This study suggested that more than two progenitor populations have been taken part in the domestication process of the Jeju native pig population, and/or probably subsequent crossing with other pig breeds from near east Asia. Unlike with our prediction, there was no direct evidence under molecular levels on the maternal introgression of Korean wild boar in the domestication of Jeju native pigs. In conclusion, specificity of mtDNA haplotypes related to pig breeds win be useful for identifying the maternal lineage as wen as constructing the genealogical pedigree in pigs.
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