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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Agricultural Science
Journal Basic Information
Journal DOI :
CNU Journal of Agricultural Science
Editor in Chief :
Volume & Issues
Volume 39, Issue 4 - Dec 2012
Volume 39, Issue 3 - Sep 2012
Volume 39, Issue 2 - Jun 2012
Volume 39, Issue 1 - Mar 2012
Selecting the target year
Study on waxy corn hybrids - XVI. Analysis of protein and amylogram on waxy corn (Zea mays L.) hybrids
Choi, Hyun-Gu ; Lee, Moon-Sub ; Bok, Tae-Gyu ; Na, Woong-Hyun ; Ko, Hyuck-Soo ; Lee, Jong-Hyun ; Yoo, Ji-Hong ; Ju, Jung-Il ; Jo, Yang-Hee ; Lee, Hee-Bong ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 161~168
DOI : 10.7744/cnujas.2012.39.2.161
Protein content of waxy corn hybrids ranged from 9.3 to 17.1%, and amylopectin content ranged from 83.9 to 94.5%. Three waxy corn hybrids including CNU043 showed less than 10 percent in protein content, and seven waxy corn hybrids including CNU052 were higher than 94% at the amylopectin content. At the amylogram test the ranges of the pasting temperature, peak viscosity, hot viscosity, cool viscosity, breakdown, setback, and consistency were 71.6~
, 58~210 RVU, 36.1~114.2 RVU, 47~145 RVU, 21.4~97.8 RVU, -66.4~-9.6 RVU, and 11.1~36.3 RVU, respectively.
Aldose reductase inhibitory activity of the methanol extracts from Korean folk plants
Kim, Hye-Min ; Han, Saem ; Choi, Kyung ; Ku, Ja-Jung ; Park, Kwang-Woo ; Cho, Eun-Ju ; Lee, Sang-Hyun ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 169~175
DOI : 10.7744/cnujas.2012.39.2.169
To search for the aldose reductase (AR) inhibitors from Korean folk plants, the inhibition of rat lens AR in vitro using the methanol (MeOH) extracts from Korean folk plants was investigated. Among fifty four Korean folk plants tested, the MeOH extract of Cedrela sinensis showed highest inhibition of AR (
). The plant C. sinensis has a possibility of new natural resources for the development of AR inhibitor for the prevention of diabetic complications.
Characteristics of woodland changes in an urban fringe in Gwangju city
Kim, Keun-Ho ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 177~182
DOI : 10.7744/cnujas.2012.39.2.177
It is widely recognised that changes in size and isolation of habitat patches have a negative impact on species richness and the distribution and persistence of populations. Thus, the aim of the research was to analyze the change, distribution and spatial characteristics of woodlands in an urban fringe landscape. The results indicated that there was a common trend of woodland loss across all landscape types while no new woodlands were established during 1976 and 2009. Small patches (less than 5 ha in size) were particularly vulnerable to and more likely to disappear due to human activities such as urbanisation. Changes in woodland cover were clearly observed between 1976 and 2009. Loss of many woodlands was caused by residential and infrastructural developments. As a result, woodlands were becoming smaller and more isolated. This trend probably had adverse effects on biodiversity. This woodland information can be used to identify the potential and specific needs for conservation planning in rapidly developing urban areas.
FSP measurement of heat-treated softwoods using volumetric swelling method
Kang, Chun-Won ; Lee, Seung-Jin ; Kang, Ho-Yang ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 183~187
DOI : 10.7744/cnujas.2012.39.2.183
Specimens of five softwood species were heat-treated at three temperature levels of
. Their FSP's were measured by the volumetric Swelling Method. Within a species the FSP decreases as the temperature of heat treatment increases. The FSP's of the controls range from 21.0% to 32.5%, while those of the specimens heat-treated at
from 18.7% to 35.3%. There was no difference of basic density between the heat-treated and control specimens.
A survey on awareness of children's woodworking activity among children and adults
Byun, Young-Man ; Kang, Ho-Yang ; Han, Gyu-Seong ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 189~194
DOI : 10.7744/cnujas.2012.39.2.189
It is well-known fact that woodworking activity could contribute in enhancing creativity, scientific problem-solving ability, spatial perception ability and prosocial behavior of children. However, there is little chance that children experience woodworking at home or in kindergarten. This study was conducted to know how much children and adults have done woodworking in there daily life and how they perceived children's woodworking activity. Woodworking activities for children (N=207, 5 and 6 year old kids) with adults (N=271, only fathers) were carried out in 10 kindergartens of Cheongju. Actually, the survey result shows that very few children and adults experienced woodworking in their daily life. 62.8% of children and 34.3% of adults surveyed responded that they had never done woodworking. However, the greater part of children and adults evaluated the woodworking activity positively. Over 95% of children surveyed responded that their woodworking activity was fun and they want to play woodworking again. Over 73% of adults surveyed responded that children's woodworking activity was safe, and over 99% of adults surveyed responded that they can recommend children's woodworking activity to others. In conclusion, the development of safe tools and programs for children's woodworking activity helps its spread and activation.
Optimization of process condition of boiled Korean native chicken by response surface methodology
Kim, Hyun-Joo ; Yun, Hye-Jeong ; Lee, Jun-Heon ; Heo, Kang-Nyeong ; Kang, Bo-Seok ; Jo, Cheor-Un ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 195~202
DOI : 10.7744/cnujas.2012.39.2.195
This study was examined the optimization of processing conditions for taste-assurance factors of boiled Korean native chicken (KNC) through response surface methodology. The effects of two independent variables, including heating time (
) and water volume (
), were investigated using central composite design. Hypoxanthine content, lipid oxidation, texture, and sensory results were chosen as dependent variable. Results showed high reliability on hypoxanthine and texture property in leg meat (not breast meat) of boiled KNC. Statistical modeling revealed that 3.5 folds of added water (v/w) based on chicken weight and 73.5 min of cooking time was the optimum for producing characteristic taste and textural properties from the leg meat of KNC.
Effects of plasma insulin, and leptin on fat traits in Hanwoo (Korean cattle)
Kim, Hyeong-Cheul ; Lee, Seung-Hwan ; Dang, Chang-Gwan ; Lim, Da-Jeong ; Choi, Bong-Hwan ; Chang, Sun-Sik ; Cho, Young-Moo ; Jeon, Gi-Jun ; Park, Eung-Woo ; Cho, Yong-Min ; Lee, Jun-Heon ; Yang, Boh-Suk ; Hong, Seong-Koo ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 203~209
DOI : 10.7744/cnujas.2012.39.2.203
The objective of this study was to examine the effect of plasma leptin and insulin concentrations on fat traits in Hanwoo. If a biological indicator such as plasma leptin and insulin was identified, it would be a useful biological marker that can be predicted marbling score in young animal. The relationship between plasma hormone (leptin and insulin) and fat traits (marbling score, back fat thickness and P8 fat thickness) was investigated. The experiment studies 100 Hanwoo that were randomly sampled from Hanwoo Experimental Station Herd. The concentration of plasma insulin was significantly associated with marbling score (P=0.02) but was not significantly with back fat thickness (P=0.07) and P8 fat thickness (P=0.09). Statistical model determinant that plasma insulin concentration account for phenotypes was moderate on marbling score (5%), back fat thickness (3%) and P8 fat thickness (9%). On the other hand, plasma leptin concentration was significantly associated with marbling score (P=0.03) and back fat thickness (P=0.02), but was not significant on P8 fat thickness (0.07). Statistical model determinant that plasma leptin concentration accounting for phenotypes was moderate effect on marbling score (3%) and back fat thickness (2%), but it has a slightly bigger effect on P8 fat thickness (7%). In conclusion, the plasma leptin and insulin seems to have an effect on fat traits (marbling score, backfat thickness and P8 fat thickness) in Hanwoo.
DNA markers in chicken for breed discrimination
Hoque, Md. Rashedul ; Lee, Seung-Hwan ; Lee, Jun-Heon ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 211~217
DOI : 10.7744/cnujas.2012.39.2.211
There is an emerging interest in using DNA markers for breed identification in animals. This article reviews the breed identification markers in chicken, mainly developed in Chungnam National University, with particular emphasis on the mitochondrial DNA markers and the nuclear DNA markers including the SNPs in MHC region and the plumage color related MC1R markers. This information would be very useful for an appropriate conservation breeding program as well as for the establishment of molecular markers for chicken breed identifications.
Identification of single nucleotide polymorphisms in the ACADS gene and their relationships with economic traits in Hanwoo
Oh, Jae-Don ; Cheong, Il-Cheong ; Sohn, Young-Gon ; Kong, Hong-Sik ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 219~226
DOI : 10.7744/cnujas.2012.39.2.219
The acyl-CoA dehydrogenase, C-2 to C-3 short chain (ACADS) gene is known to be related with fat metabolism, especially coverts the fat to the energy sources in cattle. In human, the mutations in this gene cause SCAD deficiency, which is one of the fatty acid metabolism disorders. The ACADS gene is located on bovine chromosome 17. The objective of this study was to identify SNPs in Hanwoo ACADS gene and identify the relationships with economic traits. In this study, two SNPs, T1570G SNP in exon 2 and G13917A SNP in exon 4, were observed. Moreover, in the coding region, 2 missense mutations, T (Cys)
G (Trp) mutation at 1570 bp and G (Arg)
A (Gln) mutation at 13917 bp, were observed. These mutations were subjected to the PCR-RFLP for typing 198 Hanwoo animals. The observed genotype frequency for T1570G was 0.135 (TT), 0.860 (TG) and 0.005 (GG), respectively. Also, 0.900 (GG) and 0.100 (GA) were observed for the G13917A mutation. The association of these SNPs with four economic traits, CW (Carcass Weight), BF (Backfat Thickness), LMA (Longissimus Muscle Area), MS (Marbling Score), were also observed. The results indicated that no significant results were observed in all four traits (P>0.05). This might indicate that further studies are ultimately needed to use the SNPs in ACADS gene in lager populations for effectively used for the marker assisted selection.
Problems in methodology for estimating cost of milk production and its improvement
Chun, Ryong ; Seo, Seong-Won ; Park, Jong-Soo ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 227~242
DOI : 10.7744/cnujas.2012.39.2.227
Accurate estimation of milk production cost is very important for dairy farmers in establishing strategies for business management (e.g. planning a program for milk production, deciding the size of business and investment, determining the milk price for sale). Since the estimated cost of milk production is used as an important index to determine the basal price of milk in Korea, there has been much interest and debate on the method used to estimate milk production cost among the stakeholder. This study was thus carried out to identify problems in the current methodology for estimating cost of milk production, and to find a better way to improve it. We propose several alternatives and better ways to improve the current method for estimating cost of milk production. Estimation of the income and cost per head should be based on the number of cattle converted to grown cows. Cost estimation per liter of milk should be made for both whole milk and 3.4% milk fat corrected milk. The value of purchased cows and raised replacement heifers should be the same as their market value. The productive life span of cows should be less 4 years, and the terminal or salvage value of cows needs to be 30 to 40% less than her initial value. When calculating depreciation of cows over the productive life span, however, the salvage value should be 0 or 1 Korean won. On calculating labor costs, the farm labor wage corresponding to the average wage of nonfarm industrial workers should be assumed. Beside of these, better estimation procedures for other items are also given. The proposed methods from this study should improve the accuracy of estimation of milk production cost and help to achieve consensus among the stakeholder.
Effect of natural antioxidant extracted from Citrus junos seib. or Prunus mume. on the quality traits of sun-dried Hanwoo beef jerky
Lim, Dong-Gyun ; Kim, Jong-Ju ; Seo, Kang-Seok ; Nam, Ki-Chang ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 243~253
DOI : 10.7744/cnujas.2012.39.2.243
The objective of the study was to evaluate the quality characteristics of sun-dried Hanwoo beef jerky added with the extract of Citrus junos seib. or Prunus mume. Hanwoo beef shank muscles were sliced, marinated, and sun-dried at
, relative humidity of 35%. The physicochemical quality and microbiological safety of the Hanwoo beef jerky aerobically packaged were analyzed during the storage of
. The moisture content of beef jerky with Citrus junos seib. was the lowest among the treatments after 20 d. Citrus junos seib. and Prunus mume jerky after 10 d had significantly lower aw than those after 0 and 20 d (p<0.05). The pH values of jerky generally ranged from 5.76 to 5.84. The pH value of Prunus mume jerky was significantly higher than those of other jerky samples (p<0.05). Prunus mume jerky showed significantly lower TBARS value than the others after 20 d (p<0.05). Citrus junos seib. jerky showed a significantly lower lightness (
), redness (
) and yellowness (
) than the others during the storage (p<0.05). Prunus mume samples after 10 d had significantly higher
values than the others (p<0.05). With regard to sensory properties, Citrus junos seib. and Prunus mume jerky showed significantly higher flavor and overall acceptability scores than the control (p<0.05). The extracts of Prunus mume will be used in sun-dried Hanwoo beef jerky as a natural agent to retard lipid oxidation and to improve meat color.
Xylanase properties of Bacillus subtilis AB-55 isolated from waste mushroom bed of Agaricus bisporus
Choi, Won-Ho ; Choi, Yong-Su ; Jang, Kab-Yeul ; Yoon, Min-Ho ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 255~261
DOI : 10.7744/cnujas.2012.39.2.255
A bacterium AB-55, isolated from waste mushroom bed of Agaricus bisporus in Sukseong-myeon, Buyeo-gun, Chungcheongnam-do, Korea, was screened onto xylan agar congo-red plate by the xylanolysis method and was used to produce an xylanase in shaker buffle flask cultures containing oat spelt xylans. The phylogenetic analysis using 16S rRNA gene sequence data showed that the strain AB-55 had the highest homology (99.0%) with Bacillus subtilis and it was named as Bacillus subtilis AB-55. A xylanase was purified by ammonium sulfate precipitation (50~80%), gel filtration on sephacryl S-300, and ion exchange chromatography on DEAE sepharose FF. The molecular weight of the xylanase was estimated as 44 kDa by SDS-PAGE. Optimal pH and temperature for the xylanase activity was pH 7 and
, respectively. N-terminal amino acid sequence of the enzyme was identified as Ser-Ala-Val-Lys-His-Gly-Ala-Ile-Val-Phe. The substrate specificity of the enzyme exhibited that it hydrolyzed efficiently oat spelt xylan as well as beechwood xylan, but showed no activity against Avicel and carboxymethyl clellulose (CMC). The enzyme activity was enhanced by
whereas was entirely inhibited by
Regional development through vitalization of agro-industrial complex in seocheongun
Yang, Hee-Suck ; Kim, Tai-Cheol ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 263~270
DOI : 10.7744/cnujas.2012.39.2.263
The vitalization of Agro-industrial complex could be an alternative to enhance farmers off-farm income and overcome FTA's impacts on the import of agricultural products. However, it is evaluated the governmental policy on the Agro-industrial complex has not been successfully done as expected. The Agro-industrial complex started to be composed in 1984 and the 427 Agro-industrial complex have been composed nationwide by 2011. Meanwhile, three Agro-industrial complex where 61 factories are running have been composed and two Agro-industrial complex are being under construction in Seocheongun as of 2011. It is investigated that there are constraints in the government supporting systems for Agro-industrial complex. They are; Aged and poor infrastructure facilities, Weak marketing competition, Scattered supporting agencies, and Poor loan system, etc. In this respect, the policy of supporting system was suggested and recommended to vitalize Agro-industrial complex in the study. They are; Better loan system, Improving aged facilities, Marketing support, Assisting technology, Suppling labor power, and Forming factory-network, etc.
Analysis on the installation criteria and ventilation effect for round roof windows in single-span plastic greenhouses
Nam, Sang-Woon ; Kim, Young-Shik ; Ko, Gi-Hyuk ; Sung, In-Mo ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 271~277
DOI : 10.7744/cnujas.2012.39.2.271
Dimensions, operation conditions and improvement items for round roof windows were investigated in arch shape single-span plastic greenhouse with roof vents, and natural ventilation performance was analyzed based on the ventilation theory. Diameter of round roof windows was mostly 60 cm, and chimney height projected on roof was average 30 cm. Installation space was mostly 5 to 6 m but farmhouse of 10 m and over was 16.7% also. A round roof window which has 60 cm diameter was installed to 6 m space generally and 80 cm diameter was installed to 10 m space, but correct standards did not exist. There were a lot of opinions that ventilation effect of round roof windows is fairly good and user satisfaction is generally excellent. It is problem that there is few effects in summer and that vinyl around each vent tears well and rainwater leaks, and improvement hope item required development of automatic control system. In the wind speed of 0.3 m/s, it was estimated that natural ventilation rates were 0.69, 0.55, 0.50 and 0.48 volumes per minute in case of 2, 4, 6 and 8 m installation space for round roof windows, respectively. It was analyzed that the ratio of ventilation due to buoyancy out of total ventilation were 65.2, 41.9, 29.9 and 22.8% in case of 2, 4, 6 and 8m installation space, respectively. By the round roof windows installed at space of 6 m, ventilation rate was estimated to 0.5 volumes per minute, and we can expect the increase in ventilation rate of 30%. In order to meet the recommended ventilation rate for summer season, we have to install the round roof windows at space of 1 to 2 m. However, it is difficult to apply those installation space because of falling productivity due to lower light transmittance as well as rising costs. It is estimated that the installation space of 6m is appropriate for spring or fall season. Therefore it is necessary to encourage installing the roof windows in single-span plastic greenhouses.
Efficiency analysis of agricultural machinery rental system using the DEA model
Hong, Soon-Jung ; Huh, Yun-Kun ; Chung, Sun-Ok ; Hong, Song-Hyun ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 279~289
DOI : 10.7744/cnujas.2012.39.2.279
This study was conducted to survey and diagnose operation status of the agricultural machinery rental service, analyse and compare operational efficiency among 82 city and county ATDEC (agricultural technology development and extension center) using the DEA (Data Envelopment Analysis) method, and recommend future direction, for improvement of the business. Input variables were invested budget and labor, and output variable was rental return. Percentages of return to investment on the rental service were calculated as 68.3% and 63.9% when analyzed with CCR (Charnes, Cooper and Rhodes) and BCC (Banker, Charnes and Cooper) models, respectively, indicating inefficiency of the service operation. Increase of rental charge would increase efficiency by 63.9~68.3% depending on models, and decrease of financial and labor investment would improve the efficiency by about 11.3%. Technical efficiency would be more important than scale efficiency, therefore adjustment of over-invested budget and labor needed to be made together with increase of rental charge to improve the operation. Among the ATDECs providing the rental service, 6 (7.3%), 43 (52.4%), and 33 (40.2%) were in state of CRS (constant return to scale), IRS (increasing return to scale), and DRS (decreasing return to scale), respectively. These indicated public aspects of the rental system, over-investment, lack of output component for input component, meaning that scale income would be increased by qualitative expand of rental charge. Efficiency analysis of the rental system by region showed that efficient ATDECs to be benchmarked by others were in the order of DMU-70, DMU-54, DMU-29, DMU-5, DMU-22, DMU-2, and DMU-61. More comprehensive and extensive survey and analyses would be necessary in the future.
The analysis on the trading system of garlic at the wholesale market
Kim, Soung-Hun ; Park, Ji-Eun ; Kim, Dae-Soo ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 291~297
DOI : 10.7744/cnujas.2012.39.2.291
Garlic is one of the most important seasoning vegetables in Korea. Basically, Korea has two trading systems for garlic at the wholesale market, and academic discussions about this trading system couldn't get the conclusion. The purpose of this paper is to review the marketing structure of garlic and to analyze the trading systems for garlic at the wholesale market through survey analysis. The results of studies present a few findings: First, marketers for garlic show different preferences about the trading systems of garlic at the wholesale market. Especially, the size of volume of trading garlic affects the preference of the trading system. Second, the trading systems have various problems, which are claimed by marketers. These problems need to be improved for the more efficient trading at the wholesale market. Third, the current trading systems for garlic at the wholesale market need to be continued, and they should freely selected by marketers.
Household's main activities for decreasing food wastes
Han, Jae-Hwan ; Hwang, Yun-Jae ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 299~306
DOI : 10.7744/cnujas.2012.39.2.299
This study conducted an internet survey to explore consumers' behaviors for reducing food wastes and to examine factors affecting their actions. Consumer survey demonstrates that food preparers at home purchase foods two or three times a week on average and most of food wastes are generated in the process of cooking preparation. Results show that consumers who purchase foods at supermarket reduce food wastes by frequently buying a small amount of foods and checking the expiration date. Consumers with higher income diminish food wastes by purchasing appropriate amount of foods. Interestingly, if husband and wife work together for a living, they are more active for decreasing food wastes compared to a single worker.
The exporter's attitude on the coordination of agro-food export in Korea
Kim, Kyung-Phil ; An, Kwang-Hwan ;
Korean Journal of Agricultural Science, volume 39, issue 2, 2012, Pages 307~313
DOI : 10.7744/cnujas.2012.39.2.307
The purpose of this study is to provide basic information on exporter's coordination methods from the attitude of agro-food exporters. The implications are; Firstly, most of exporters believe that the agro-food export raises farmer's competitiveness rather than it does the farmhouse's income increase. Secondly, The stabilization of the farm-gain income by exporting agricultural products are most important in order to reinforce the cohesion between farmers and exporters. Thirdly, the exporters intend to participate in establishing and operating a large-scale producers' organization and marketing company under export polices. So, it is necessary that the government drive to coordinate the exporters and producers.