• 한국육종학회지
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• 제50권4호
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• pp.516-521
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• 2018

신품종 '누리찰'은 찰성 쌀보리 신품종으로 국립식량과학원에서 계통육종법으로 육성하였다. 3개 지역에서 답리작 지역적응시험을 실시한 결과 답리작 적응성이 높으며, 쓰러짐에 강하고 수량이 7-16% 증가된 보리밥 특성이 좋은 계통임이 입증되었다. 출수기와 성숙기는 답리작에서 새찰쌀보리보다 각각 1일 늦었다. 간장은 82 cm로 중장간, 수장 4.0 cm, $m^2$당 수수는 774개로 새찰쌀보리와 많았으며 천립중은 25.0 g으로 새찰쌀보리보다 가벼웠고 도복에 강하고 보리호위축병에 저항성을 보였다. 단백질 함량은 새찰쌀보리보다 적었고, ${\beta}-glucan$, 전분, 아밀로스 함량은 새찰쌀보리와 비슷하였다. 흡수율은 비슷하였고 퍼짐성은 다소 높았다. 호화특성은 최고점도가 높고 치반점도가 낮았으며, 보리밥 물성은 경도, 탄력성, 저작성이 새찰쌀보리보다 낮아 보리밥이 다소 부드러운 특성을 보였다. 평균수량성은 답리작에서 4.00 MT/ha로 새찰쌀보리보다 10% 증가하였다.

• 한국육종학회지
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• 제41권4호
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• pp.630-634
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• 2009

1995년에 내재해 다수성 특성을 지닌 "수원300호"를 모본으로, 조숙 호위축병저항성인 "하가네무기//CI08397/하가네무기"를 부본으로 인공교배하여 수량성이 높고 도복이 강한 우수 겉보리 계통 "익산407호"를 선발하였다. 2005년부터 3개년간 지역적응시험을 실시한 결과 답리작 적응성이 높으며, 광지역성으로서 수량성이 높고, 도복 등 재해에 강한 특성과 효소력가가 높은 계통으로 2007년 국립종자원에 "혜당"으로 출원하였다. 신 육성품종의 특성은 다음과 같다. 1. 6조 겉보리이며 파성은 III이며, 이삭의 밀도가 밀한 편이며 까락이 길지만 탈망성이 좋다. 2. 출수기와 성숙기는 전작, 답리작에서 대조품종보다 각각 3일 빠른 조숙종이다 3. 흰가루병은 올보리와 비슷하다. 보리호위축병에는 바이러스 strain이 I형인 나주와 IV형인 진주에서는 저항성을 나타내었으나 III형인 익산에서는 중정도의 저항성을 나타내었으며, 내한성과 내도복성은 올보리보다 다소 강하였다. 4. 간장(80 cm)은 올보리보다 8 cm 짧았으며, 수장은 약간 크고, $m^2$당 수수는 696개로 올보리보다 23개, 1수립수는 51개로 1개 많았으며, 천립중은 올보리보다 0.4 g 작은 대립종이며, 1L중은 다소 가벼웠다. 5. 단백질 함량과 ${\beta}$-glucan 함량은 올보리와 비슷하였고, 정맥률과, 입백도는 높았다. 엿기름의 효소력가는 올보리보다 30 DP 높았다. 6. 수량성은 올보리에 비해 전작(4.17 MT/ha)에서 23%, 답리작(4.27 MT/ha)에서 9% 각각 증수되었다.

• 한국육종학회지
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• 제41권1호
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• pp.56-60
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• 2009

"대양"은 우리 나라에서 재배가 가능한 조숙 양질 다수성 쌀귀리 품종을 육성하고자 미국의 조숙성 쌀귀리 계통인 'LX446-1-84-Q1'을 모본, 대립 겉귀리 계통인 'SO92004-B-3-3-5-7'을 부본으로 인공 교배하여 계통육종법에 의해 계통을 선발한 후 2002년부터 생산력검정시험과 지역적응시험을 거쳐 2007년에 육성된 품종이다. 그 특성은 다음과 같다. 1. "대양"은 잎폭은 넓으며, 이삭형은 산수형이고, 종실은 길고 갈색이다. 2. "대양"은 재배지 3개년 평균 출수기가 5월 8일로서, 기존 육성된 '선양'과 유사하였다. 3. "대양"은 천립중이 30.3g으로 선양의 24.5g에 비해 5.8g 무거운 대립종이며, 지역적응시험에서의 평균 종실 수량은 4,180kg/ha으로 '선양'보다 20%나 많았다. 4. "대양"은 탈부율이 높고, 조단백질 함량은 11.2%, 베타 글루캔 함량은 4.6%로서 표준품종인 '선양'과 비슷하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제15권11호
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• pp.1653-1658
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• 2002

The objectives of this study were to examine calpain activity and meat tenderness by three different feeding patterns in Korean native cattle (KNC). Total forty-five animals were assigned each fifteen in long term restriction feeding (LTFR), long-term restriction feeding and hormone treatment (LTFR-tH), and short term non-restriction feeding (STFNR), respectively. Concentrate was restricted based on body weight in exp 1 and 2. However, it was fed ad libitum in exp. 3. Hormonal implantation was made with $M-PO^{TM}$ for bulls and with $F-TO^{TM}$ for heifers at 18, 20, 22 months of age in exp. 2. Animals were purchased (3-5 month old) from local cattle market and managed in two local farms and university research unit at three different years. Animals were slaughtered at 24 months for long-term trial and at 18 month for short term-trial. Loin and tender loin muscle was used for calpain activity and meat quality. Calpain proteolytic system was not changed by treatment. However, calpastatin activity was low in short-term trial. The calpain and calpastatin activity is reciprocal relationship, therefore, the high calpain activity may effect on quality grade. The shear force value was decreased as the processing of aging after postmortem. On the other hand, the cooking loss was significantly higher in short-term than in long-term trial, and then gradually decreased by the aging. Hormone implants to increase meat yield influenced to calpastatin activity more powerfully than calpain activity to meat tenderness. In meat color-a*, there was not significant difference in loin. Meat color-b* was decreased as postmortem aging time increased in tenderloin. Western blots were done to learn whether these proteins are degraded during postmortem storage and whether this degradation temporally parallels the decrease of shear force value. Vinculin was detected at 0 day and 1 day and degraded after 3 day. In conclusion, Calpain activity was affected slightly on meat tenderness. But meat tenderness was influenced by calpastatin, more effectively.

• Asian-Australasian Journal of Animal Sciences
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• 제31권12호
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• pp.1881-1889
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• 2018

Objective: In dryland areas of China, alfalfa hay (AH) is a possible substitute for concentrate feed for beef cattle. To evaluate the potential benefits of this substitution, we studied the effect of the ratio of AH intake to total dry matter (DM) intake on average daily body-weight gain (ADG), dietary energy utilization status, and economic benefit in Gansu province. Methods: In each of two feeding trials in 2016 (trial 1 [T1], July 3 to 17; trial 2 [T2], August 15 to September 23), crossbred male Simmental calves were allocated to low AH (LA), medium AH (MA), and high AH (HA) feeding groups (n = 4 per group). The target ADG was set as 1 kg for both trials. In a one-way-layout design based on conventional feeding practices in the province, calves received diets containing the different AH amounts, with a constant ratio of corn stover:total DM and decreasing rations of concentrate feed proportional to the increase in AH. Calves in T1 received AH at 15% (T1-LA), 23% (T1-MA), or 31% (T1-HA) of their dietary DM allowances; those in T2 received 9% (T2-LA), 24% (T2-MA), or 34% (T2-HA) AH. Results: Among the T1 groups, both ADG and economic benefit were highest in T1-LA; whereas in T2, they were higher in the T2-LA and T2-MA groups than in T2-HA. Energy digestibility did not significantly differ among the groups in either trial. The dietary AH inclusion ratios of 14% in the warm season and 8% to 21% in the cool season appeared to yield optimal ADG, metabolizable energy intake, and economic benefit. Conclusion: Low-level inclusion of AH, ranging from 8% to 21%, is a practical approach for beef cattle feeding. This modified feeding regimen likely will promote increased growth performance during the fattening stage of beef steers in dryland areas of Gansu province, China.

• Animal Bioscience
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• 제35권7호
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• pp.999-1009
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• 2022

Objective: To improve the feeding value of rice straw (RS), this study evaluated the potential of rice straw fermented with Pleurotus sajor-caju (FRS) as dairy goat feed. Methods: Spent Pleurotus sajor-caju mushroom substrate was used as fungi inoculum to break the lignocellulose linkage of rice straw, which was solid-fermented at 25℃ to 30℃ for 8 weeks. The ruminal degradation of pangolagrass hay (PG), FRS, and RS were measured in situ for 96 hours in three dry Holstein cows, respectively. Effect of fungi fermented RS on milking performance was studied in feeding trials. A total of 21 Alpine goats a trial were divided into 3 groups: a control group in which PG accounted for 15% of the diet dry matter, and FRS or RS was used to replace the PG in the control group. Goats were fed twice a day under two 28-day trial in individual pens. Meanwhile, a 3×3 Latin square trial (14 days/period) was conducted to study the rumen digestion of three diets by using three fistulated dry goats. Rumen contents were collected for metabolite analyses every one to three hours on the last two days. Results: In situ study showed that fermentation could elevate the rumen degradable fraction and effective degradability of RS (p<0.05). Effective degradability of FRS dry matter was significantly increased from 29.5% of RS to 41.7%. Lactating trial results showed that dry matter intake and milk yield in the PG group and FRS group were similar and higher than those in RS group (p<0.05). The concentration of propionic acid and total volatile fatty acid in the RS group tended to be lower than those in PG group (p<0.10). There were no differences in rumen pH value and ammonia nitrogen level among the groups tested. Conclusion: Fermentation of rice straw by spent Pleurotus sajor-caju mushroom substrate could substantially enhance its feeding value to be equivalent to PG as an effective fiber source for dairy goat. The fermented rice straw is recommended to account for 15% in diet dry matter.

• 응용통계연구
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• 제10권1호
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• pp.15-27
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• 1997

Randomized block design (RBD) with three replication is very frequently adopted in agricultural experiments of the Rural Development Administration of Korea. Even though it works well in field trials of traditional crops, it may not accomodate trial site conditions and/or experimental environment. In this research report, we deal with two such cases. The first case is for a crop experiment in green houses. In house conditions, RBD may not be appropriate since it cannot reflect two directions of the yield gradient. So, a Latin square design is suggested as an alternative. The second case is for local field experiments of the newly-inbred rice. RBD with three replications is used without doubt for decades, even though the site layout is not appropriately shaped for the design. In this case, we suggest the RBD in two blocks with multiple replicates for control varieties as an alternative. To improve the quality of statistical experimental designs in over one-thousand agricultural trials performed annually in the Rural Development Administration, we need to re-train agricultural researchers on the design and analysis of experiments and call for concerns of Korean statisticians.

• 식물조직배양학회지
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• 제24권4호
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• pp.203-212
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• 1997

The impact of plant genetic engineering, a technology born in the early 1980's, is beginning to be felt across the world in the 1990's. The first wave of engineered plant produce are reaching consumers in the supermarket and many more are destined to follow Transformation technology now exists for most plant, including the four staple crops-maize, wheat, rice, and soybean. Early targets of genetic engineering include plane possessing insect resistance and herbicide tolerance, with future goals set on increasing harvestable yield, improving nutritional quality, and making specialty products. This review describes some of the milestones in plant biotechnology, the U.S. regulatory agencies, field trial numbers and deregulated plants, commercialization criteria, examples of commercialized plants, and future prospects of plant biotechnology.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2009년도 춘계학술대회 논문집
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• pp.172-175
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• 2009

The purpose of this study is to predict the forming limit diagram (FLD) of strain-rate sensitive materials on the basis of the Marciniak and Kuczynski (M-K) theory. The strain-rate effect is taken into consideration in such a way that the stress-strain curves for various strain-rates are inputted into the formulation as point data, not as curve-fitted models such as power function. To solve the nonlinear system of equations derived from the equilibrium and constraints in the groove region and the safe zone, the Newton-Raphson method is used. The theoretical FLDs using four different yield criteria, that are von Mises, Hill (1948), Hill (1979), Logan and Hosford, are compared with the experimental, numerical (FEA) and other theoretical results. A new trial is made where a modified M-K model having n-step grooves is introduced to describe a real localized neck.

• 전기학회논문지P
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• 제50권3호
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• pp.125-129
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• 2001

ln this paper, a ozone generator using superimposition of silent discharge has been designed and manufactured. This type ozone generator is equipped with three electrodes and two gaps. Ozone is generated by superimposition of silent discharge, which is respectively come from two gaps. The maximum values of ozone concentration, ozone generation flow and ozone energy field were obtained 4,750[ppm], 2.37[g/h], 102.3[g/kWh]. Also, the result of reaction of 1,8921ppm] ozone and the sampling water from the lake, the water quality was improved from IV grade to In grade, and obtained 100[%] sterilization rate of Escherichia coli within 5.0(min).