• 한국토양비료학회지
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• 제40권6호
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• pp.460-464
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• 2007

호남평야지에서 건답직파 조기파종재배에 알맞은 질소 분시방법을 구명하고자 '97~'98년에 호남농업시험장 수도포장인 전북통(미사질양토)에서 동진벼를 공시하여 시험한 결과를 요약하면 다음과 같다. 질소분시방법간 토양 중 암모니아태 질소 함량을 보면 5엽기에는 관행(T1, 기비시용)보다 추비중점시비(T2, T3)에서 많았고 그 이후는 점차 줄어들어 출수기에는 질소 분시방법간에 차이가 적었다. 엽면적 및 지상부 건물중은 생육초기에는 차이가 없었으나 최고분얼기 이후에는 3엽기:7엽기:수비=40:30:30%로 분시 한 처리에서 가장 많았다. 질소 흡수량과 질소 이용율은 관행 분시방법보다 추비중점시비에서 높았는데, 2차 추비시기 간에는 5엽기보다 7엽기에 시비한 처리에서 높았다. 수량구성요소 중 등숙비율과 현미천립중은 질소 분시방법간에 별 차이가 없었으나 $m^2$당 수수는 T3 > T2 > T1 순으로 많아, 쌀 수량은 관행에 비하여 3엽기:5엽기:수비=40:30:30%로 분시한 처리에서 3%, 3엽기:7엽기:수비=40:30:30%로 분시한 처리에서 6% 증수되었다. 따라서 벼 건답직파 조기파종재배에 알맞은 질소분시방법은 3엽기:7엽기:수비로 각각 40:30:30%로 분시하는 것이 적당한 것으로 판단되었다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권2호
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• pp.209-216
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• 2019

Objective: We compare the effects of three different approved sources of supplemental zilpaterol on growth-performance responses and carcass characteristics of finishing lambs. Methods: Twenty four Pelibuey${\times}$Katahdin lambs ($46.75{\pm}2.43kg$) were used in a 33-day feeding trial. Lambs were fed a dry rolled corn-based finishing diet. Treatments consisted of the non-supplemental basal diet (Control) versus the basal diet supplemented with 125 mg zilpaterol/kg of diet (as fed basis) from three commercial sources marketed in Mexico: Zilmax (ZIL), Grofactor, and Zipamix. Results: Compared to controls, zilpaterol (ZH) supplementation did not affect dry matter intake (DMI), but increased carcass adjusted daily weight gain (ADG, 36.7%), gain efficiency (34.2%), and dietary net energy (26.0%), and decreased (23.4%) the ratio of observed:expected DMI. Compared to controls, supplemental ZH increased hot carcass weight (6.4%), dressing percentage (3.2%), m. longissimus thoracis (LM) area (15.6%), and shoulder muscle:fat ratio (28.7%), but decreased kidney-pelvic-heart fat, and fat thickness. Supplemental ZH increased 10.9% and 14.3% whole cut weight of loin and leg, respectively, and the proportion (as percentage of cold carcass weight) of leg (4.3%). These increases were reflected in greater forequarter and hindquarter weights. Lambs fed ZH increased (4.6%) empty body weight (EBW) and reduced (14.7%) liver/spleen weight (as g/kg EBW). Likewise, ZH supplementation tended (p = 0.08) to lower (8.9%) visceral fat. Growth performance, energetic efficiency, hot carcass weight, dressing percentage, LM area and whole cuts were not different across supplemental ZH sources. However, compared with non-supplemented controls, only ZIL appreciably decreased carcass fat distribution, including fat thickness, percentage kidney pelvic and heart fat, shoulder fat, and visceral fat. Conclusion: Supplemental ZH increases ADG, gain efficiency, carcass dressing percentage, and LM area. The magnitude of these responses was similar among ZH sources. Nevertheless, compared with non-supplemented controls, only ZIL appreciably decreases carcass fat. The basis for this is uncertain, but indicative that some practical differences in zilpaterol bio-equivalency may exist across commercial sources tested.

• 농업과학연구
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• 제50권2호
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• pp.337-346
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• 2023

Synbiotics help to improve gut health by promoting the growth of beneficial bacteria while glyconutrients provide a source of energy for the gut bacteria and may also have immunemodulating effects. The aim of the present study was to assess the effect of this combination on fatty acid and meat quality characteristics of growing pigs. In a five-week experiment, 804 growing three-way crossbred ([Landrace × Yorkshire] × Duroc) pigs with an initial body weight of 31.90 ± 2.6 kg on average were assigned to two treatments: 1) CON (basal diet) and 2) TRT1 (basal diet + 0.3% glycozyme [synbiotics and glyconutrient]), each consisting of 402 pigs. The TRT1 groups showed significantly higher values of palmitoleic acid (C16:1), capric acid (C10:0), myristic acid (C14:0), lauric acid (C12:0), elaidic acid (C18:1, t), pentadecylic acid (C15:0), gondoic acid (C20:1), lignoceric acid (C24:0), and omega-6 : omega-3 in fat than the CON groups. Moreover, in the lean tissues of the pig, the levels of C12:0, C14:0, C17:0, and C20:1 were significantly higher in TRT1 than in CON. However, significant differences were not observed after glycozyme addition in pH, water holding capacity, cooking loss, longissimus muscle area, drip loss, meat color, and sensory evaluation parameters. To conclude, the positive results of the fatty acid composition indicate that glycozyme may be an effective pig feed additive.

• 한국축산식품학회지
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• 제28권3호
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• pp.327-332
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• 2008

본 연구는 Bacillus 균주가 함유된 배합사료 급여시 비육돈의 생산성, 육질 특성 및 분내 유해가스 발생에 미치는 영향을 알아보기 위해 실시하였다. 시험 개시시 체중이 $83.53{\pm}1.01\;kg$인 3원 교잡종(Landrace${\times}$Yorkshire${\times}$Duroc)의 비육돈 36두를 공시하였으며, 5주간 사양시험을 실시하였다. 시험설계는 1) CON(basal diet), 2) B1(basal diet + B. subtilis 제제 0.1%) 및 3) B2(basal diet + B. subtilis 제제 0.2%)로 3개 처리를 하여 처리당 3반복, 반복당 4두씩 완전임의 배치하였다. 전체 사양시험 기간 동안의 체중, 일당증체량, 일당사료섭취량 및 사료효율은 처리구간에 유의적인 차이가 없었다(p>0.05). 육질 특성에 있어서도 처리구간에 유의적인 차이가 없었다(p>0.05). 황화수소($H_2S$)는 B2처리구가 다른 처리구와 비교하여 가장 낮은 함량을 나타났다(p<0.05). 암모니아($NH_3$), 메캅탄(R SH) 및 acetic acid의 함량은 처리구간에 유의적인 차이는 없었지만 B2처리구가 대조구에 비해 감소하는 경향을 나타났다(p>0.05). 결론적으로 비육돈에 있어 생균제 0.2% 첨가 급여시 분내 악취 물질에 있어 효과가 있는 것으로 나타났다.

• 한국환경생태학회지
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• 제12권3호
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• pp.242-252
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• 1998

The inhabitation environments and growth conditions of Machilus thunbergii community in the Pyonsanbando located at southwestern area in Korea were examined and analyzed to provide some practical data to be used to establish measures for long term succession monitoring, protection and sustainable management. The Machilus thunbergii community are located at Kyokpo-ri, Pyonsan-myon, Puan-gun(35$^{\circ}$35′24"N~35$^{\circ}$ 42′30"N, 126$^{\circ}$28′18"E~126$^{\circ}$40′40"E). Within the Pyonsanbando area the mean temperature is 12.4$^{\circ}C$, the warmth index 101.5$^{\circ}C$.month, the coldness index -12.3$^{\circ}C$ month and the annual precipitation 1,016mm. The soil within the community is silt loam or clay loam and so fertile. 30 species and 1 varieties of 21 families inhabited at the community. There were 18 grown trees and 131 saplings of Machilus thunbergii within the community. The mean basal diameter, mean height, and crown width of grown trees was measured to be 57.4cm, 7.4m and 9.0~9.8m respectively. And 9 trees were full flowering, 2 trees small flowering here and there, and 7 trees non flowering in 1998. The mean branch growth length was 8.3cm, mean leaf area 18.3$\textrm{cm}^2$, mean inflorecence length 9.3cm, mean fertilization 14.5％ and mean seed diameter 7.6mm. Further rich management measure and investigation were recommended such as sapling protection, signboard construction, soil erosion controlling and regular monitoring within the community.

• 한국농림기상학회지
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• 제4권1호
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• pp.1-11
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• 2002

본 연구는 경기도 가평, 광주, 그리고 충청북도 영동에 식재된 잣나무 차대검정림을 대상으로 미기후가 잣나무 초기생장에 미치는 영향을 구명하기 위하여 수행하였다. 이를 위해 먼저 지역별ㆍ임령별로 평균 흉고직경, 평균 수고, ha당 흉고단면적, ha당 재적 등의 임분통계량을 측정ㆍ요약하였으며, 이에 근거하여 10년 생부터 20년 생까지 10년 간의 초기생장에 대한 임분변수별 연년생장량을 파악하였다. 환경요인으로서 각 차대검정림의 지역별 미기후 조건이 생장에 미치는 영향을 분석하기 위해 지형기후학적 방법과 공간통계 기법을 사용하였다. 이상과 같이 얻어진 연도별 기후 추정치에 근거하여 임목생장에 영향을 미치는 30개의 기후지수를 각 차대검정림별로 추정하였다. 최종적으로 이들 30개의 기후지수와 각 임분변수별 연년생장량 간의 상관분석 및 회귀분석을 통하여 국지기후가 잣나무 생장에 미치는 영향을 파악하였다. 지역별 잣나무의 초기생장은 경기도 가평과 광주의 순서로 우수하였으며, 충청북도 영동은 매우 저조한 것으로 나타났다. 이러한 지역별 생장특성은 각 연구 대상지의 미기후와 밀접한 관련을 가지고 있는데, 기온이 낮고 높은 습도를 유지하는 지역이 잣나무 생장에 적합한 것으로 분석되었다. 특히 상관분석과 임분 변수별 생장을 추정하기 위해 도출된 최적 회귀식에 채택된 기후지수를 보면 잣나무의 초기 생장에 결정적인 영향을 미치는 미기후 조건은 낮은 기온인 것으로 판명되었다.

• The Korean Journal of Ecology
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• 제17권4호
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• pp.523-531
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• 1994

Optimal conditions for the seed germination and growth of Hedyotis diffusa were studied. As photoperiod was increased from 12 hr to 24hr, the germination rate of Hedyotis diffusa was gradually increased. The photoperiod and temperature inflenced on the fermination synergistically. After the growth of 20 weeks under the natural condition (June~Oct.), the length of H. diffusa was $38.9{\pm}4.2cm$ (15.5~52.5cm), and total dry weight per $3.3m^2$ was $316.7{\pm}10.3g$. It is considered that H. diffusa could be cultivated in a part of inland. The anticancer effect of H. diffusa extract was examined. F-344 rats aged 6 weeks were divided into 3 groups and were given an I.P. of diethylnitrosamine at 200mg/kg body weight as a promoter, initially. And in two weeks after the beginnign of the experiment, group 1 was supplied iwth feed containing 0.02% 2-AAG as a promoter for 6 weeks. Group 2 was supplied with feed containing extracts of H.diffusa (0.02%) for two weeks. Group3 was supplied with only basal diet. All rats were sacrificed for partial hepatectomu, and the antipromoting effect was examined by the number 문 area per $cm^2$ of foci in river. In group 1, the number of hyperplastic nodule was $18.5{\pm}7.7$, but in group2, it was drastically reduced to $10.3{\pm}1.8$ rather thn those of group1. The total area of nodules $(mm^2)$ /whole liver $(cm^2)$ of group 1 and group2 were $19.2{\pm}7.7$ and $5.0{\pm}3.2$, respectively. These results indicate that extract of H.diffusa act as an anticancer agent at statistically significant level (p<0.001).

• Asian-Australasian Journal of Animal Sciences
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• 제21권7호
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• pp.1033-1037
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• 2008

The purpose of the present study was to investigate the effects of chromium picolinate (CrPic) on growth hormone (GH) secretion and pituitary GH mRNA expression in finishing pigs. Forty eight crossbred pigs with an initial body weight of 65.57 kg (SD = 1.05) were blocked by body weight and randomly assigned to two treatments with three replicates. Each group was fed the diet supplemented with or without $200{\mu}g/kg$ chromium from CrPic for 40 days. The results showed that average daily gain of pigs was increased by 9.84% (p<0.05), and longissimus muscle area was increased by 17.29% (p<0.05) with the supplementation of CrPic. The results of GH dynamic secretion showed that supplemental CrPic increased the mean level and peak value of GH by 36.58% (p<0.05) and 26.60% (p<0.05), respectively, while there was no significant effect on basal value, peak amplitude and peak duration. Pituitary mRNA expression of GH was not significantly influenced by supplemental CrPic. These results indicated that CrPic increased pigs GH secretion without change of pituitary GH mRNA expression.

• 한국유기농업학회지
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• 제7권2호
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• pp.189-195
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• 1999

Under the no-till direct-sown rice-vetch cropping systems, where whole chopped rice straw were returned to the paddy surface at combine harvest and whole-plant of Chinese Milk Vetch(Astragalus sinicus L.) was submerged after direct-sowing, three levels of nitrogen top-dressed(0, 2, 4 kg N/10a) without basal N and two levels of sowing rate were applied into the paddy field in expectation of the enhancement of nitrogen efficiency and protection of agricultural environment in reduced N-fertilizer level. A cultivar, Dongjin, was direct-sown on May 30, 1996. Characteristics of rice growth and physicochemical properties of rice plant were observed. Under the system, reduced total N(4 kg N/10a) resulted in high panicle numbers. N-top dressed toward at later growth stages enhanced the ratio of panicle-producing tillers and at spikelet numbers per panicle. As N-level increases, DM yields of leaf and stem at heading were increased. Maximum grain yield was obtained at 4kg N/10a and major attributed factors to grain yield in this case were the number of grains per unit area and the ratio of ripened grain.

• 한국작물학회지
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• 제47권4호
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• pp.273-278
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• 2002

An efficient low-input system (LIS) for fertiliser use in rice cultivation is necessary to reduce fossil energy use and pollution. Japanese people like Japonica rice, especially cv. Koshihikari. However, it has very low lodging resistance in Japanese weather condition. Our objective was to develop a LIS with the minimum sacrifice of grain yield in rice. Koshihikari was grown using conventional fertilization as a control (CON) with 4 g N $m^{-2}$., 8g $P_2$ $O_{5}$ $m^{-2}$ and 8 g $K_2$O $m^{-2}$ as a basal fertilizer dressing. It was compared with a low fertilizer treatment (LF) with only 4 g $P_2$ $O_{5}$ $m^{-2}$ as a basal dressing in the first year and no basal phosphorus fertilizer in the second year. Chopped rice straw was incorporated into the soil before the cropping season in both years. Fertilizer of 4 g N $m^{-2}$ was top-dressed at 15 days before heading in CON plots and 30 days before heading in LF plots in both years. Lodging was significantly less in LF than in CON plots, however, no rice straw effect was found in low fertilized condition. Grain yields in LF plots were reduced by 15-16% below those of CON plots. Lower yields in LF plots were associated with a reduced number of spikelets per unit area. However, big spikelet size was acquired in LF by 10 days earlier N top dressing than CON plots. A close relationship was found between spikelet numbers and N content of the plant at heading, and between grain yield or shoot dry weight and N content of the plant at maturity. Regardless of the fertilizer application methods, N use efficiency for the number of spikelets, final total dry matter and grain yield was essentially identical among fertilizer treatments. The reduced growth and yield in the LF plots resulted from low absorption of nitrogen. Conclusively, LIS can drastically reduce chemical fertilizer use and facilitate harvest operations by reducing lodging with some yield reduction..