• 한국작물학회지
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• 제50권5호
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• pp.301-308
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• 2005

This study was carried out to investigate the effect of stem-cutting (SC) length and portion on the major agronomic characters related with dry matter production and accumulation, and to examine their relation­ships in cassava. When cassava was planted with longer SCs or with older portion SCs, major canopy or source characters like leaf number and leaf area index developed excessively, while tuber yields could be reduced due to the decrease of root/shoot ratio, relative growth rate, root dry weight, and harvest index, particularly in the bitter varieties (high cyanide-level varieties). It was considered that the sweet varieties (low cyanide-level varieties) be early­bulked with higher tuber yield when they are planted with the 25-30 cm long SCs or with the SCs from young type to semi-mature portions of mother stems, while the bitter varieties with the 15-20 cm long SCs or with the SCs from semi-mature to hardwood portions of mother stems, respectively. However, a significant interaction between length and portion of SC was not observed in all agronomic characters.

• 한국초지조사료학회지
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• 제16권3호
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• pp.245-252
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• 1996

This experiment was carried out to investigate the effect of feeding order bay-concentrate-silage, concentratehay- silage, silage-concentrate-hay, silage-concentrate-hay, concentrate-silage-hay) on ruminal characteristics change with 3 fistulated dry Holstein cows in a Latin square design. The main results obtained were as follows : DM intake in forage hayconcentrate-silage feeding order was 1.65% of body weight, which is the highest of all treatments, but that in concentrate-hay-silage 1.4%, which is the lowest. The difference between max and min rumen pH in hayconcentrate-silage feeding order was lowest as 0.55, but there is no significant. The mean rumen $NH_3N$ content in silage-concentrate-hay feeding order was highest as 6.12mg/100ml, but that in silageconcentrate-hay feeding order lowest as 4.82mg/100ml. Acetic acid and propionic acid content was highest in forage hay-concentrate-silage feeding order. but there is no significant. The ratio of acetic acid to propionic acid averaged 3.47~3.69(NS). In conclusion, the best feeding order fitted in ruminal physiology was forage hay-concentrate-silage.

• 한국작물학회지
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• 제39권3호
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• pp.256-261
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• 1994

닥풀의 재래종(칠리종)을 계통분리하여 얻은 34계통중 초형이 다른 대표적인 단경, 중경 및 장경의 3개계통에 대하여 적심방법에 따른 식물체 각 부위의 생육 및 수량의 변이를 조사한 결과를 요약하면 다음과 같다. 1. 적심처리(개화직전)때의 초형별 생육특성은 경장은 단경계통 24cm, 중경 37cm, 장경계통이 80cm로서 그 차이가 컸으며 개화기는 단경계통의 8월3일에 비하여 경장이 길수록 2∼3일 늦었고 꽃봉우리수도 단경계통의 5개에 비하여 중경 19, 장경 24개로 경장이 길수록 많았으며 분지수는 4∼5개, 주경절수는 10개 내외로 큰 차이가 없었다. 2. 닥풀의 주 이용부위인 생근수량은 초형별로는 장경일수록 많으며 기타 경중 및 삭중과 각 부위의 건물수량도 동일한 경향이었다. 3. 적심방법에 따른 생근수량은 어느 초형에서나 주경과 분지를 함께 적심한 구에서 가장 증수되었으며 화뢰적제구에서도 많은 증수를 보았으나 주경적심의 효과는 거의 없었다. 전체평균에서는 무처리구의 459kg/10a(100)에 비하여 주경 및 분지를 함께 적심한 경우 102%, 화뢰적제에서도 66%의 증수를 보였다. 4. 생체의 구성비율은 같은 초형에서는 적심방법 간에서는 큰 차이가 없었으나 초형간에 있어서는 지상생육량이 적은 단경계통의 생근중비율(전중대)이 약 40%로 가장 높고 생육량이 많은 중경, 장경계통일수록 낮은 경향이었다. 5. 뿌리의 건조비율(건근중/생근중)은 단경계통 이 31.6%인데 비하여 중경 38.1%, 장경계통은 40.2%로서 생근수량이 많았던 장경계통일수록 높은 경향이었다.

• Journal of Radiation Protection and Research
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• 제20권2호
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• pp.123-128
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• 1995

대전지역 토양에 대한 Cs-137 및 Sr-90 방사능농도를 분석 하였다. 토양중 Cs-137 농도와 유기물 함량 사이에 일정한 상관관계를 보였다. 인위적 교란이 없는 미경작지 토양에 대한 Cs-137 및 Sr-90의 평균 방사능농도는 14.37Bq/kg-dry와 7.95Bq/kg-dry 수치로 핵실험에 의한 방사성낙하물 농도와 유사한 값을 나타내었다. 미경작지를 포함한 26개 지점에서 Cs-137/Sr-90의 방사능비는 평균 1.99 정도로 Cs-137의 침적 농도가 Sr-90의 경우 보다 두배 정도 높음을 알 수 있었다.

• 한국약용작물학회지
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• 제27권5호
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• pp.307-314
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• 2019

Background: We measured the weight characteristics, intercellular space volume as a proportion of root volume, and quantities of the functional component in Angelica gigas Nakai, collected from four cultivation areas in Pyeongchang, including Tapdong-ri and SangjinBu-ri, and tested the results for correlations. Methods and Results: Dry weight was the highest in the Tapdong-ri group ($13.37{\pm}0.13g$) and the lowest in the SangjinBu-ri group ($11.90{\pm}0.57g$). The percentage of intercellular spaces within the roots, determined by micro-CT camera, was the highest in the Tapdong-ri group ($6.44{\pm}0.76%$) and the lowest in the SangjinBu-ri group ($9.01{\pm}2.15%$). The quantity of functional components were the highest in the Tapdong-ri group ($116.13{\pm}9.53mg/g$) and the lowest in the SangjinBu-ri group ($99.77{\pm}23.23mg/g$). Conclusions: The dry weight of A. gigas significantly correlated with the volume and percentage of intercellular space. An increase in the dry weight resulted in a negative correlation between the volume and ratio of the intercellular spaces. The volume of intercellular space correlated negatively with levels of the functional components, this was significant in the case of the nodakenin, decursin and decursinol angelate content (p < 0.016).

• Asian-Australasian Journal of Animal Sciences
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• 제19권9호
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• pp.1305-1313
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• 2006

Five male dairy goats (Saanen), 4.6 month old with a body weight of 21.4 ($SD{\pm}1.6$) kg, were used to examine 5 dietary urea treatments in a $5{\times}5$ Latin Square experimental design. The five levels of urea were 10, 20, 30, 40 and 50 g urea/kg DM of steam-treated oil palm fronds (OPF) and dry matter intake tended (p>0.05) to increase with increasing urea supplementation up to 30 g/kg OPF (77.7 g/kg $BW^{0.75}$), but decreased (p<0.05) with 40 and 50 g urea/kg OPF (67.4 and 63.7 g/kg BW0.75, respectively) supplementation. Similarly, dry matter, organic matter, crude protein, neutral detergent fiber and hemicellulose digestibilities increased (p<0.05) with the addition of urea to 30 g/kg OPF but thereafter decreased (p<0.05) with 40 and 50 g/kg OPF. Ruminal pH, ruminal $NH_3$-N concentration and plasma urea concentration increased linearly (p<0.01) and quadratically (p<0.01) as a consequence of addition of urea to the diet. Excretion of total purine derivatives (PD) by goats fed 30 g of urea/kg OPF was highest (p<0.05) followed by goats fed 20, 40, 10 and 50 g of urea/kg OPF. Microbial N (g N/day) and efficiency of microbial N supply expressed as g N/kg organic matter apparently digested in the rumen were higher (p<0.05) in goats fed 30 g of urea/kg OPF (5.5 g N/day and 22.0 g N/kg DOMR, respectively) than in goats on 10 and 50 g of urea/kg OPF treatments. However, the former did not differ from goats fed 20 g of urea/kg OPF (3.9 g N/day and 16.6 g N/kg DMOR, respectively). Ruminal VFA concentration, protein/energy ratio, N absorption and N retention increased (p<0.05) with the addition of urea to the diet up to 30 g/kg OPF but decreased (p<0.05) with 40 and 50 g/kg OPF. This implies that the optimal level of urea supplementation in an OPF based diet was about 30 g urea/kg OPF.

• 한국초지조사료학회지
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• 제25권2호
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• pp.137-142
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• 2005

본 실험은 고랭지 산지초지에서 예취횟수와 시비수준이 목초의 식생변화와 건물수량 및 사료성분에 미치는 영향을 검토하기 위하여 3년간 실시하였다. 실험은 표고 600m에서 예취횟수를 2회와 3회, 시비수준을 ha당 질소-인산-칼리 200-200-200kg의 소비구 및 280-200-240kg/ha의 표준시비구로 나누어 실시하였다. 화본과목초의 비율은 2회 예취가 3회 예취보다 높았으며, 클로버 비율은 3회 예취한 소비구에서 $16.3\%$로 가장 높았다. 잡초는 모든 처리구에서 $3.7 {\~} 6.7\%$ 비율로 낮은 결과를 보였다. 평균 건물수량은 예취횟수와 시비수준 처리간에 유의차가 없었으나 3회 예취구에서 표준시비구가 소비구보다 높은 경향으로 나타났다. 3회 예취구가 2회 예취구에 비해 조단백질 함량은 높고 조섬유함량이 낮았다. 시비수준에 따른 사료성분에 차이는 없었다. 이상의 결과를 종합하면 대관령지역의 표고 600m에서 적정 예취회수는 식생구성, 건물수량, 사료성분 및 영양소수량 면에서 3회 예취가, 시비수준은 표준시비구(질소 - 인산-칼리 280-200-240kg/ha)가 적당하다고 사료된다. 그러나 대관령지역과 같이 지역적인 여건(복잡지형, 기후불순 등)이나 축산 농가 개인의 여건(수확기계 미비, 인력 등)이 불리한 경우에는 2회 예취, 소비구(질소-인산-칼리 200-200-200 kg/ha)도 가능하다고 사료된다.

• Asian-Australasian Journal of Animal Sciences
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• 제22권2호
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• pp.206-215
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• 2009

This experiment was carried out to evaluate performance and carcass characteristics of 40 crossbred young bulls ($Zebu{\times}European$) finished in a feedlot under two roughage sources (Bermuda grass hay or sorghum silage) with or without the addition of yeast (Saccharomyces cerevisae). The bulls were 20 months old, their initial average weight was 356 kg and they were allocated into four groups of ten animals. The experimental diets were Bermuda grass, Bermuda grass+yeast, sorghum silage and sorghum silage +yeast. Animal performance and carcass characteristics were not influenced by roughage source or yeast addition. The average daily weight gain was 1.50 kg, dry matter intake (DMI) was 11.1 kg/d, DMI as percentage of liveweight was 2.60% and feed dry matter conversion was 7.70. The mean dressing percentage was 52.0% and hot carcass weight was 268 kg. Carcass conformation was classified between good-minus to good. Carcass length (137 cm), leg length (72.9 cm) and cushion thickness (26.6 cm) were not influenced by treatments. The average fat thickness was 3.80 mm and the Longissimus muscle area was 66.9 $cm^{2}$. The classification of color, texture and marbling were slightly dark red to red, fine and slight-minus to light-typical, respectively. The mean percentage of bone, muscle and fat in the carcass was 15.5%, 62.3% and 22.5%, respectively. Yeast addition increased ${\gamma}$-linolenic fatty acid (0.15 vs. 0.11%) deposition. Bermuda grass hay increased deposition of ${\alpha}$-linolenic (0.49 vs. 0.41%), arachidonic (2.30 vs. 1.57%), eicosapentaenoic (0.41 vs. 0.29%), docosapentaenoic (0.80 vs. 0.62%), docosahexaenoic (0.11 vs. 0.06%) and n-3 fatty acids, and reduced n-6: n-3 ratio in meat, when compared to sorghum silage treatments. The treatments had no effect on saturated fatty acids (49.5%), polyunsaturated fatty acids (11.8%), n-6 fatty acids (9.87%), n-3 (1.61%) and PUFA:SFA ratio (0.24). Monounsaturated fatty acid levels were higher on sorghum silage (40.7 vs. 37.7%). The addition of yeast caused higher n-6: n-3 ratio (7.28 vs. 5.70) than treatments without yeast.

• 농업생명과학연구
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• 제46권3호
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• pp.79-85
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• 2012

This study was conducted to examine the effect of dietary n-3/n-6 fatty acid (FA) ratio on in vitro dry matter digestibility (IVDMD), fermentation indices and FA profile. Rice bran was mixed with oil sources (cotton seed oil and linseed oil) to make the diets at 0.02, 0.29 and 0.61 of dietary n-3/n-6 FA ratio. These diets (0.5g) were placed into the incubation bottles with 40 ml of anaerobic culture medium, which contained rumen fluid and Van Soest medium at 1:2 ratio. Five replicates of each diet and two blanks were incubated at $39^{\circ}C$ for 48 hours. After incubation, the incubated contents were centrifuged. The residues were freeze-dried for DMD and FA analyses. The supernatant was used for pH, $NH_3-N$ and volatile fatty acid analyses. The concentrations of lactate (p<0.001) and iso-valerate (p<0.001) decreased linearly with increasing dietary n-3/n-6 FA ratio, but acetate concentration (p=0.056) and the ratio of acetate to propionate (p=0.005) was increased linearly. The concentrations of n-3, n-6 FA and the ratio of n-3/n-6 FA in residues increased (p<0.001) linearly with increasing dietary n-3/n-6 FA ratio, but C18:1n-9 FA concentration was decreased (p<0.001) linearly. With these results, it could affect fermentation characteristics and FA profile of rumen content by dietary n-3/n-6 FA ratio.

• 원예과학기술지
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• 제33권6호
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• pp.839-844
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• 2015

본 연구는 고추 묘의 소질과 정식 후 생육 및 수량에 대한 육묘 기간(45, 55, 65, 75일 및 85일)의 영향을 알아보고자 수행하였다. 육묘 기간에 따라 정식 전 고추 묘의 초장, 마디수 및 엽면적, 생체중 및 건물중은 육묘 기간이 긴 묘일수록 높았고, T/R율은 45일 및 85일 묘에서 높았다. 육묘 기간에 따라 생산된 고추 묘의 정식 후 10주째에 초장, 경경, 엽면적은 45일 및 55일 묘에서 뚜렷이 높았다. 식물체의 생체중 및 건물중은 45일 묘에서 무거웠지만, 건물률은 가장 낮았다. 착과된 과실의 수 및 무게는 45일 묘에서 가장 높았다. 정식 후 18주 동안 성숙과 수확량은 45일 및 55일 묘에서 많은 경향을 나타내었다. 상기 결과들을 종합하면 고추의 생육 및 상품과 생산량은 45일과 55일 묘에서 좋았다. 그러므로 노지 재배 시 고추 묘의 육묘 기간은 45일에서 55일 사이가 적합할 것으로 판단된다.