• Korean Journal of Breeding Science
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• v.41 no.3
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• pp.228-235
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• 2009

Growth and branch characteristics of 35 half-sib families were surveyed in a seedling seed orchard of Quercus acutissima at ages 10 and 12. The averages of height, DBH (diameter at breast height), branch height, crown width, branch angle and stem straightness at age 12 were 9.96 m, 14.50 cm, 1.04 m, 6.80 m, $18.82^{\circ}$ and 2.58, respectively. Families of 075 and 052 showed superior height growth and 0511 and 0517 were inferior ones. For DBH growth, 075 and 0413 were best families and 0725 and 0511 were inferior families. Pearson's product moment and Spearman's rank correlation coefficients were all positive for all growth traits except branch angle at ages 10 and 12. This result showed that the families with good height and DBH growth were also superior in stem straightness. In ANOVA, there was a highly significant difference among families in height, DBH, cylindric volume and stem straightness. Branch height, crown width and branch angle were also significantly different among families. Family heritability was higher than individual heritability at ages 10 and 12. Height, DBH and stem straightness were under strong genetic control, showing high family heritability. This implies that high genetic gain could be expected by family selection. Expected genetic gain for each trait was estimated based on the family selection. The highest genetic gain was expected for the traits of branch angle, height and DBH because of the large phenotypic standard deviation and the high family heritability. The growth performance and branch characteristics were weighted by the magnitude of genetic variation and heritability. The weighted values were then subjected to estimate family breeding values. This family breeding value would be applied as a criterion in the genetic thinning of the seed orchard.

• Monthly Korean Chicken
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• s.141
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• pp.85-87
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• 2007

2005년 하반기 육용원종계 쿼터제가 사실상 붕괴된 이후 원종계 수입이 지속적으로 증가하고 있다. 실제 2006년 총 수입물량은 141,600수로 지난해 109,200수 대비 29.7%가 증가했고, 올해 수입예정 물량도 195.000수에 달해 향후 종계 및 육계 수급불안이 예상된다. 이에 가금수급안정위원회는 지난 2월 8일 양계협회 회의실에서 4개 원종계사(삼화육종, 한국원종, 하림, 마니커)가 참석한 가운데 육용원종계 수급대책에 대해 논의하는 자리를 가졌다. 이날 회의에서 원종계 4사는 향후 종계 및 육계 수급안정 차원에서 원종계 감축이 필요하다는 데 공감대를 형 성했다. 그러나 이미 자체사용량과 판매처 등이 확정된 상태여서 향후 수급불안 문제를 어떻게 풀어갈 것인가가 관건이다. 본고는 이날 회의자료를 일부 발췌해 게재한 것이다.

• Journal of Korean Society of Forest Science
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• v.43 no.1
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• pp.74-86
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• 1979

동위효소(同位酵素)가 임목분야(林木分野)의 연구(硏究)에 이용(利用)되기 시작(始作)한지 10여년이 지난 요즈음 많은 분야(分野)에서 그 성과(成果)가 높이 평가(評價)되고 있다. 특(特)히 복잡(複雜)한 유전변이(遺傳變異)를 가지고 있는 천연임분(天然林分)에서의 유전분석(遺傳分析)으로 많은 것을 밝혀 내어 임목(林木)의 유전육종학적(遺傳育種學的) 측면(側面)뿐만 아니라 삼림유전생태학적(森林遺傳生態學的)인 면(面)에서도 큰 도움을 주고 있다. 본(本) 총설(總說)은 지금까지 임목(林木)에 대(對)한 동위효소(同位酵素) 이용(利用) 실례(實例)를 중심(中心)으로 앞으로 응용(應用) 가능분야(可能分野)에 대(對)해 검토(檢討)한 것이다.

• Korean Journal of Agricultural Science
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• v.7 no.1
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• pp.12-26
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• 1980

A new, improved maize varieties are greatly needed to meet the national demand for the maize, and a new germplasm should be investigated to supply necessary breeding materials for the required maize breeding. The Korean local maize lines, which has never been wholly studied for the purpose of breeding should be enough to supply such breeding materials at least in Korea. The objectives of this study were to maintain useful Korean local lines, to investigate good plant characters and to analyze the Korean local maize lines in the respect of genetic make-up. A total of 820 lines and 200 lines were used for the present study. Lines to maintain were planted at experimental farm of the Crop Experiment Station, Office of Rural Development, Suwon and the lines to study genetic make-up were planted in Dae-jon. The summarized results are as follows : 1. A total of 1200 lines from 820 collections were sibbed for future use. 2. Two hundred collection were sibbed, selfed and testcrossed for genetic study in 1980. 3. Ten lines were surely confirmed as resistant lines to virus disease epidemic in most introduced maize varieties. 4. A dozen Lines were having three to four ears per plant. 5. Five lines were showing three to four tillers per plant. 6. One of the most significant and important finding through the study was to obtain the lines with three to four tillers bearing all together eight to nine ears. The lines of multi-ears and multi-tillers must have great breeding potential for the future use. 7. A great variation was observed in the tasselling days, 100 kernel weight and protein content. 8. From the genetic study of local maize lines for plant height and 100 kernel weight, the following findings were obtained. a. On the average six percent of inbreeding depression expressed in percent decrease over sibbed counterpart were found for the plant height. b. Fourty percent of heterosis expressed in percent increase over sibbed counterpart were observed in the plant height. c. The homogeneity or degree of homozygosity calculated from heterosis minus inbreeding depression was on the average 34 percent for plant height. d. The average inbreeding depression expressed in percent decrease over sibbed counterpart was 15 percent for 100 kernel weight. e. The average heterosis expressed in percent increase over sibbed counterpart was 43 percent for 100 kernel weight. f. The degree of homozygosity calculated from the heterosis minus inbreeding depression was 28 percent for 100 kernel weight.

• Journal of Korean Society of Forest Science
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• v.108 no.3
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• pp.302-310
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• 2019

Precise and fast identification of crop cultivars is essential for efficient breeding and plant breeders' rights. Traditional methods for identification of jujube cultivars are based on the evaluation of morphological characteristics. However, due to time constraints and environmental influences, it is difficult to distinguish cultivars using only morphological traits. In this study, we cloned fragments from improved inter simple sequence repeats (ISSR) analysis, and developed stably diagnostic sequence-characterized amplified region (SCAR) markers. The specific ISSR bands of jujube cultivars from Dalizao and Boeundaechu were purified, cloned, and sequenced. As a result, four clones labeled 827Dalizao550, 827Boeun750, 846Boeun700, and 847Dalizao850 were identified. In order to investigate whether they were specific for the jujube cultivar, four pairs of SCAR primers were then designed and polymerase chain reaction (PCR) amplifications were conducted to analyze 32 samples, including jujube and sour jujube. In the PCR amplification of the 827Dalizao550 SCAR marker, the specific bands with 550 bp were amplified in six samples (Dalizao, Sandonglizao, Dongzao, Yuanlin No. 2, Suanzao 2, Suanzao 4), but unexpected bands (490 bp) were amplified in the others. Moreover, in the PCR amplification of the 847Dalizao850 SCAR marker, the specific bands with 850 bp were found in three samples (Dalizao, Sandonglizao, and Dongzao) and 900 bp unexpected bands were amplified in five samples (Pozao, Suanzao 1, Suanzao 2, Suanzao 3, Suanzao 4). These results showed that newly developed markers could be useful as a fast and reliable tool to identify jujube cultivars. However, further identification of polymorphic information and the development of SCAR markers are required for the identification of more diverse cultivars.

• Journal of Veterinary Clinics
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• v.28 no.6
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• pp.603-606
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• 2011

An 11-year-old castrated male cocker spaniel presented with halitosis, anorexia, and swelling of the left face. Upon physical examination, a firm mass was detected in the left buccal mucosa. Fine needle aspiration cytology revealed a malignant tumor of mesenchymal origin. We performed biopsy, which gave a diagnosis of oral fibrosarcoma. The client refused surgical treatment, and carboplatin chemotherapy (300 $mg/m^2$, IV, q 21 days) was initiated. The mass gradually decreased in size and disappeared about 89 days after the initial chemotherapy. Complete remission was attained, and the tumor did not relapse. This case report shows that a single carboplatin chemotherapy session can achieve macroscopic complete remission of oral fibrosarcoma.

• The Journal of the Korean bone and joint tumor society
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• v.1 no.1
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• pp.91-97
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• 1995

Synovial sarcoma is a malignant soft tissue tumor which is the most prevalent in adolescents and young adults between 10 and 40 years of age. It occurs primarily in the para-articular regions, usually in close association with tendon sheath, bursae and joint capsules. Favorable clinical factors are young age of the patients, tumor size smaller than 5cm, and distal rather than proximal location in the extremities. We analysed clinical findings of 13 cases of synovial sarcoma that had been experienced from January 1983 to December 1992. There were 8 females and 5 males, whose age was averaged as 28 years and 10 months ranging from 6 years to 54 years. The mean follow-up was 3 years(range : 9 months- 9 years 1 month). Palpable mass was frequent clinical symptom and lower extremity especially around the knee was the most prevalent site. Treatment modalities were the combination of surgery, radiotherapy and chemotherapy. Distant metastasis occured in 5(38%) cases : 4 cases to lung and 1 case to neck, and 2 cases had local recurrences. At final follow-up 6 cases were continous disease free, 2 alive with disease and 5 died of disease. The Kaplan-Meier's estimated 5 year survival rate of total 13 cases was 66% and satisfactory results were obtained with mass size smaller than 5cm.

• Journal of Animal Science and Technology
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• v.44 no.5
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• pp.507-518
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• 2002

A multiple-trait stochastic computer simulation model was constructed to predict the breeding schemes and selection methods on Hanwoo(Korean cattle). The model could be used four kinds of selection criteria (random, phenotype and true or estimated breeding values). At the test run in various population size for 20 years, all estimated parameters of the each simulated populations were resulted similar to input parameters. The deviations between input and output values of parameter in the large population were smaller than in the small population. The simulated results obtained from ten small populations consisted with one sire and ten dams in each population for 500 years were as follows; Inbreeding coefficients of population were similar to theoretical estimating function. Mean values of each traits selected were randomly drifted by generation, but they were converged into a value when inbreeding coefficients came close to one. Additive genetic variances within each population were reduced by generation, and they were converged into zero when inbreeding coefficients came close to one. These results indicated that the simulated populations hold to statistical properties of input parameters.

• Korean Journal of Breeding Science
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• v.40 no.3
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• pp.263-268
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• 2008

Estimates of genetic gain (in volume growth) and diversity (expressed as status number, $N_s$) were determined in a clonal seed orchard of Pinus koraiensis. The genetic thinning was based on clonal breeding values (represented by general combining ability) obtained from progeny tests, clonal fertility estimated by strobilus production, and clonal size variation determined by the ramet numbers per clone. Parental GCA values for volume growth were calculated, based on height and diameter at breast height measured from field trials. Clonal fertility was estimated from the assessments of strobilus production over twelve years from 1991 to 2003, and used for the calculation of status number. There are 179 clones and 5,268 ramets in 12ha area of P. koraiensis clonal seed orchard. Genetic gain and diversity estimates were determined under assumptions of 30% pollen contamination and inferior genetic value of contaminating pollen. Genetic gain increased as thinning rates were set from 10% to 60%. However, for the higher thinning intensities, the increase of genetic gain was not remarkable. Genetic thinning by means of truncation selection resulted in a greater genetic gain but a large decrease in status number. Status number was represented around 40 clones for 10% through 60% thinning intensities, but for the higher thinning intensities, it was a bit fluctuated. Based on the present results, it could be concluded that thinning rate should not be stronger than 60% to optimize genetic gain while conserving genetic diversity. Consequently 50% or 60% thinning rate might be appropriate for genetic thinning in the clonal seed orchard of P. koraiensis. The effect of pollen contamination on the genetic gain and the consequence of genetic thinning for seed production in the clonal seed orchard, and seed orchard management scheme were also discussed.

• Korean Journal of Breeding Science
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• v.41 no.4
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• pp.437-443
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• 2009

In this study, we used the random amplified polymorphic DNA (RAPD) technique to evaluate the genetic relationships among 29 grapevine cultivars (Vitis spp.). Sixty selective primers detected a total of 558 polymorphic bands. By UPGMA (unweighted pair-group method arithmetic average) cluster analysis with 558 polymorphic bands, the 29 grapevine cultivars were divided into six major groups at 58.8% genetic similarity. The "Super Hamburg" was clustered in group I. Group II consisted of "Wonkyo RA-23", "Muscat Hamburg", "Tano Red", and "Tankeumchu". Group III consisted of "Alden", "Wonkyo RA -21", "Wonkyo RA-30", and "Dutchess". Group IV included 14 grapevine cultivars ("Heukgoosul", "Heukbosuk", "Suok", "Wonkyo RA-29", "Wonkyo RA-22", "Kyoho", "Pione", "Beniizu", "Golden Muscat", "Jinok", "Doonuri", "Campbell Early", "Delaware", and "Schuyler"). Group V consisted of "Hongdan", "Tamnara", "Hongisul", and "Himrod seedless". Group VI included 2 cultivars ("Cheongsoo", and "S. 9110").