Background: The Hanwoo industry must develop technologies that can increase the production of preferred cuts to match changing consumer trends. In this study, we aimed to estimate the genetic parameters for carcass traits (carcass weight, eye muscle area, back fat thickness, and intramuscular fat) and primal cut traits (tenderloin, loin, strip loin, neck, clod, top round, bottom round, brisket, shank, and rib) in a Hanwoo population to obtain basic data for improving primal cut productivity. Methods: Data from 1,905 Hanwoo steers, including carcass traits and primal cut weights, were collected. Genetic parameters were estimated using REMLF90 in a multi-trait analysis. Results: High heritability was found for carcass weight (0.52) and strip loin yield (0.63). Genetic correlations between carcass weight and primal cut weights ranged from 0.52 to 0.93. Conclusions: This study demonstrates the significant potential for genetic improvement in Hanwoo cattle through selective breeding, particularly for traits with high heritability and genetic correlations. These findings provide crucial insights into optimizing breeding programs to improve Hanwoo cattle production efficiency.

본 연구는 제주에서 사육되고 있는 제주흑돈(제주 제래돼지 합성돈)에서 생산형질인 등지방두께, 일당증체량, 90kg도달일령과 번식형질인 총산자 수 및 생존산자수를 조사하고, 이에 대한 상가적효과와 모체환경효과를 통한 분산성분 및 유전모수를 추정하여 유전적 개량에 필요한 기초 자료를 위해 분석을 진행하였다. 생산형질 내에서 등지방두께, 일당증체량 및 90kg도달일령에 대하여 추정된 유전력은 각각 0.364, 0.271 및 0.300으로 추정되었으며, 번식형질 내에서 총산자수와 생존산자수에 대하여 추정된 유전력은 각각 0.072, 및 0.076로 유전력을 갖는 것으로 추정되었다. 생산형질에서 모체의 유전분산과 모체 공통 환경분산은 각각 0.019-0.385과 0.034-0.357로 추정되었으며, 번식형질의 경우 모체공통 환경분산은 0.348-0.459 로 추정되었다. 따라서, 제주흑돈에 대한 유전모수 추정 시 개체의 직접적인 유전효과 뿐만 아니라, 모체의 유전 또는 공통 환경효과를 고려해야 유전모수 등이 과대 추정 (over-estimate) 되는 현상을 방지 할 수 있으며, 개체들에 대한 정확한 유전 능력 평가가 이루어질 것으로 사료된다.

웅취는 돼지고기의 이취로서 소비자의 소비성에 부정적인 영향을 미친다. 웅취는 거세를 하지 않은 수퇘지의 지방조직에 안드로스테 논, 스카톨 및 인돌과 같은 호르몬의 축적으로 인한 것이다. 본 연구는 웅취에 영향을 미치는 호르몬과 성장 및 번식 형질간의 유전상관도 를 추정하고 동물복지측면에서 웅취 호르몬이 낮은 수퇘지를 개발하기 위해 수행되었다. 본 연구를 위하여 3개 품종, Duroc, Landrace, Yorskhire 517두를 공시돈으로 수행하였다. 웅취 호르몬 분석을 위한 샘플채취는 수퇘지의 목부위 지방을 바이옵시 방식으로 채취하여 각 품종별 안드로스테논, 스카톨 및 인돌을 분석하였다. 안드로스테논 분석 결과, Duroc 품종이 1.684 ug/g으로 가장 높았고, 타 품종은 0.875-0.920 ug/g으로 상대적으로 낮았다. 스카톨의 농도는 Yorskhire가 0.095 ug/g으로 가장 높았고 인돌은 Duroc이 0.058 ug/g으로 가장 높았다. 품종과 개체에 따라서 3종류 웅취 호르몬의 농도 차이는 매우 컸다. 안드로스테논, 스카톨 및 인돌의 유전력은 0.40, 0.17 및 0.01으로, 안드로스테논의 유전력이 가장 높았다. 웅취 호르몬 농도와 다른 경제 형질(성장 및 번식 형질) 사이의 유전적 상관관계를 조사하였으나, 웅취 농도와의 상관관계는 매우 낮았다. 웅취 호르몬의 농도가 유전력도 높고 개체별 차이가 크고 다른 경제 형질과의 유전적 상관도가 낮기 때문에, 육종을 통한 저 웅취 부계 종돈 작출이 가능할 것으로 판단된다.

본 연구는 홀스타인 젖소 201,327두의 1산에서 5산까지의 검정기록 총 388,747개를 이용하여 유생산 형질에 대한 유전모수를 추정하고자 수행되었다. 1산차의 검정기록이 전체자료의 51.8%를 차지하였으며, 산차가 증가할수록 검정기록의 수는 현저히 감소하였다. 1산차의 유량, 유지방량과 유단백량에 대한 유전력은 각각 0.28, 0.26과 0.23으로 추정되었으며, 산차가 증가할수록 유전력은 일괄적으로 감소 하였다. 유량, 유지방량, 유단백량에서 산차간 유전상관계수의 범위는 0.83~1.00, 표현형상관계수의 범위는 0.21~0.51로 유전상관계수보다 항상 낮게 추정되었다. 연간 표현형 개량량은 유량, 유지방량과 유단백량에서 각각 121.50kg, 4.45kg과 4.65kg, 연간 유전적 개량량은 각각 13.70kg, 0.33kg과 0.36kg이었다.

The objective of this study was to efficiently produce forage crop seed of spring oat (Avena sativa L., cultivar High Speed) in Gyeongbuk area. Forage crop oats (130 kg/ha) were sown with a randomized block design. They were sown in triplicates in 2015 and 2016 using basal fertilizer of 70 kg N, 74 kg P, and 39 kg K/ha. Agronomic traits and seed production of oats were investigated to determine the influence of seeding dates (February 28/29th, March 10th, and March 20th). Heading, flowering, and maturing dates of these oats sown on February 28/29th and March 10th were almost close to each other with 1-2 days of difference for all test plots. For oats sown on the last day (28/29) of Feb., plant heights (111.6-122.6 cm) were significantly longer than those sown in March each year. In addition, panicle number (416.7 per m2) and panicle length (17.3 cm) of oats sown on the last day of February were also significantly (p < 0.05) larger than those of oats sown in March in 2015 and 2016, respectively. Based on these results, it is recommended to sow these oats on the last day of February to have better agronomic traits in terms of plant height, stem length, panicle length, and panicle number per m2. Grain numbers (56.3 and 63.3) and kernel weights (1.72 and 2.00 g) per spike in plots of oats sown on the last day of February were also significantly (p < 0.05) larger than those of oats in other plots in 2016 and in the average of 2015~2016, respectively. The highest grain yield (6,243 kg/ha) was obtained when oats were sown on the last day of February. Feed value of harvested oats was good in terms of proximate compositions including fiber contents and TDN contents. In conclusion, sowing on the last day of February is the most effective way to increase seed production of spring oats in Gyeongbuk area of Korea.

The insulin-like growth factor binding proteins (IGFBPs) is involved in the regulating effects and the biological activities of the insulin-like growth factors (IGFs). Recently, It has been reported that the IGFBP2 gene polymorphism was associated growth and skeletal development in chicken. This study was designed to investigate the association of the C1032T SNP of IGFBP2 gene with growth and egg production traits in Korean native chicken (KNC) population as well as other chicken breeds. A total of 225 chickens from the three breeds (Rhode Island Red, Cornish, Leghorn) and 245 chickens from the six strains of Korean native chickens including Black, Gray, Ogol, Red, White, and Yellow, were genotyped by PCR-RFLP (polymerase chain reaction-restricted fragment length polymorphism) and analyzed the association between their genotypes and economic traits by SAS program. The results showed that the SNP (single nucleotide polymorphism) was significantly associated with multiple traits, including body weight of 150 days (p<0.001 and p<0.05) in the Rhode Island Red and the KNC (White) and egg production number (p<0.05) in the KNC (Black) breed. These results suggest that IGFBP2 C1032T SNP could be used as a DNA marker for the improvement of economic traits in Korean native chicken breeding.

Single nucleotide polymorphisms (SNPs), that usually occurs with a modification in single nucleotide among the population of 1000 nucleotides. Such changes in nucleotides have been investigated and been associated by meat scientist for economically important traits and to increase economical profits in stock breeding. Pluralities in the study have correlated SNPs of potential candidate gene with economically important traits in domestic animals have been put forward. In chickens, INS, IGF1, IGF1R, IGFBP, CAPN1, CAPN3, GHSR, FATP1, FGFBP1, FGFBP2, apoVlDL-Ⅱ, PB1, miR-1614-3p, DAAM1, Wnt3A, LRP5, CHP, RHOA, MAPK9, SFRP1, ATGL, PGC-1α, NPY, GnRHR, PRL, TGFβ2, CASR. UCP, ADSL, STAT5b, LRP2 and CTSD genes have been found to have significant effects on body weight, breast muscle weight, carcass weight and egg number. For the similar reasons, SNPs of these genes have been considered useful DNA markers for the improvement economic value of poultry. Although further studies on different breeds of chickens would be required to segregate such dataset for different breeds of chickens.

본 연구는 재래 돼지의 산육 능력을 개량하기 위한 기초 자료를 제공하기 위하여 축산과학원에서 2001년부터 2006년까지 20 kg에 검정을 개시하고 70 kg에 검정을 종료하여 발육 능력을 조사한 546개의 재래 돼지 산육 능력 검정 자료를 활용하여 유전모수를 추정하였으며, 재래 돼지 사육 농가의 사양방법 개선을 위하여 2003년부터 2005년까지 조사된 재래 돼지성돈 및 검정돈 132두의 발육 단계별 체중 및 체위 조사 자료를 다중 회귀 분석하여 재

축산연구소에서 사육중인 비거세우와 거세우를 대상으로 혈청내에 있는 호르몬 및 대사물질 농도가 채혈시기, 사육지역, 거세 여부 등에 따라 어떻게 변하며 경제형질과 어느 정도 상관이 있는지 그리고 이들에 대한 유전변이의 크기는 어느 정도이며 이들의 유전상관계수는 어느 정도인지를 파악하기 분석한 결과는 다음과 같다 1. 혈청 호르몬 및 대사물질의 분산분석 결과 testosterone과 globulin을 제외한 나머지 혈청성분은 사육지역에 따라 차이가 있었고

한우 종모우의 고환둘레와 정액성상 그리고 후대희 성장 및 도체성적과의 관계를 구명하기 위하여 4~8세 한우 종무우 92두를 공시하였으며 8,628개의 종모우 정액성상 그리고 종모우 후대 814e의 성장 및 도체성적을 이용하였다. 종모우의 고환둘레는 38.73.73 cm, 1차 정액량, 정자농도 및 총정자수는 각각 5.63mL, 17.9/mL 및 100.34/ejaculation 이었고 2차 정액량, 정자농도, 및 총정자수는 각각 5.32mL, 15.0/

This study was carried out in 2014 and 2015 to investigate the effect of transplanting density on panicle production and to analyze the relationship of panicle production with yield traits in the mid-maturing quality rice cultivar ‘Haiami’ in the mid-plain area of Korea. Number of tillers per square meter increased by reducing planting distance and increasing seedling number per hill. These effects were maintained until maturity and were reflected in the final number of panicles per square meter, although the effect of planting density decreased as rice growth progressed. However, increased panicle number per square meter following dense planting did not improve head rice yield. Panicle number per square meter was negatively associated with spikelet number per panicle and was not correlated with other yield components or head rice yield. Head rice yield was not correlated with head rice percentage but was closely and positively correlated with milled rice yield. Milled rice yield did not increase with grain filling percentage but increased with spikelet number per square meter. Spikelet number per square meter increased with both spikelet number per panicle and panicle number per square meter, although the former had a greater influence. Therefore, we conclude that head rice yield of the ‘Haiami’ cultivar grown in the mid-plain area of Korea is not improved with an increased panicle number following high planting density but it could be improved with high milled rice yield by increasing spikelet number per unit area.

Soybean is a crop of importance economically and nutritionally in many parts of the world. Thanks to many new genes brought from genomic research, It is possible to introduce various candidate genes through genetic transformation to see the performance of the genes in field. In our lab, soybean transformations have been tried for last 10 years to probe the possibility of traits improvement by transformation of new gene into soybean. For this purpose, three different genes were transformed into Korean soybean variety, Kwangan. First, the gene that controls early flowering of plant was transformed into Kwangan. Second, a candidate gene for soybean mosaic virus (SMV) resistance was transformed to produce transgenic plants. Third, another candidate gene for drought tolerance was transformed. All the transgenic plants from three genes transformation were produced for their gene insertion and their expression using PCR, qRT-PCR. Further analysis including harvesting seeds is currently undertaken.