• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.370-374
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• 2007

난분해성 유기물 처리에 적절한 불용성 전극을 선정하고 성능을 평가하기 위하여 1-3 성분계 전극을 이용하여 양이온 염료인 Rhodamine B (RhB)의 전기분해 처리에서 다음의 결론을 얻었다. 1) 반응 2분 후 RhB 농도를 고찰한 결과 RhB 농도감소는 Ru-Sn-Ti/Ti ${\fallingdotseq}$ Ru-Sn-Sb/Ti > Ir-Sn-Sb/Ti > Sn-Sb/Ti > Ru/Ti > Ir/Ti > Pt/Ti의 순서로 나타나 3성분계 > 2성분계 > 1성분계 전극의 순서로 나타났다. Ru를 사용한 전극이 Ir을 사용한 전극보다 1성분계와 3성분계 모두 성능이 우수한 것으로 나타났다. 기존 전극으로 가장 많이 사용되고 있는 Pt 전극의 성능은 가장 떨어지는 것으로 나타났다. 2) RhB 초기 농도감소 속도는 전극 간격이 좁은 것이 유리한 것으로 나타났으나 최종 농도는 비슷하였다. 전극 간격이 좁을수록 전력 면에서 유리한 것으로 나타났다. 면적이 큰 전극이 초기 반응이 빠르고 나타났고 최종농도도 약간 낮은 것으로 나타났으나 차이는 크지 않았다. 면적이 좁은 경우 반응면적이 적지만 전류밀도가 높기 때문에 성능의 차이는 크지 않으나 면적이 적은 전극의 경우 요구 전력량이 높기 때문에 적절한 크기의 전극이 필요한 것으로 사료되었다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2000.05a
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• pp.257-258
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• 2000

난류계의 말전복, 까막전복, 시볼트전복과 한류계인 참전복이 우리나라에 서식하고 있으며, 이 중에서 참전복이 주로 양식되고 있다. 그동안 참전복용 배합사료에 관해 기초적인 연구가 수행되어 왔고, 국내에서도 사료비를 절감시키기 위하여 영양소 요구량 설정 및 값싼 전복 배합사료 개발을 위한 연구가 수행되고 있다. Lee et al. (1998, 1999)은 전복 배합 사료의 첨가제로서 해조류, 한약제 등의 효능을 비교하여 그들의 사용 가능성을 제시한 바 있다. 이어서 본 연구는 우리나라의 주 양식 대상종인 참전복 배합사료의 첨가제로서 한약제의 효능을 재평가하기 위하여 실시되었다. (중략)

• Feed Journal
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• v.5 no.6 s.46
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• pp.60-64
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• 2007

석유의 매장량은 한정되어있고 석유에 대한 수요량은 지속적으로 증대됨에 따라 국제원유가격은 끝없이 치솟고 있다. 아울러 석유를 비롯한 화석연료는 지구온난화를 가속시키고 있어 대체에너지의 개발에 세계가 관심과 노력을 경주하고 있다. 세계최대의 석유소비국인 미국에서는 지속적 재생이 가능하고 온실가스발생이 적은 biofuel의 생산에 박차를 가하고 있는데 특히 옥수수를 이용한 에탄올 생산을 지속적으로 증대시켜 화석연료의 사용량을 줄이겠다는 원대한 계획을 Bush대통령이 직접 진두지휘하고 있다. 이러한 정책의 결과로 이미 국제 옥수수가격은 폭등하고 있다. 옥수수가 에탄올 생산에 사용되는 비중이 높아짐에 따라 사료용 옥수수 가격의 지속적인 상승이 예상되는 한편 부산물로 생산되는 옥수수주정박(DDGS; distiller's dried grains with solubles) 공급량의 지속적인 증가도 예상된다. 이러한 대세가 원료수입 의존도가 높은 한국의 사료산업과 축산업계에 미치는 충격을 최소화 하기 위해서는 대체사료자원의 개발과 DDGS의 활용에 관한 관심과 연구가 그 어느때 보다 더욱 절실하게 요망된다. 차제에 DDGS에 대한 이해와 사료적가치평가 및 활용에 보탬이 되고자 앞으로 biofuel과 DDGS산업개황, DDSG의 물리화학적 특성, 영양성분 및 품질변이, 축종별 사용방안, DDGS의 상대적 가치, 구매요령 등에 대하여 약 10회에 걸쳐 연재로 소개하고자 한다.

• Food Science and Preservation
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• v.17 no.1
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• pp.151-159
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• 2010

Changes in volatile organic compounds were investigated during storage after electron beam irradiation. Grapes were irradiated at 0.25, 0.5, 0.75, and 1.0 kGy and stored for 1 month at $4^{\circ}C$. Butanol, hexanal, [E]-2-hexenal, hexanol, and 3-methyl-butanol were the major volatile organic compounds of grapes. The types of volatiles in irradiated grapes were similar to those of non-irradiated samples but concentration differed among treatments. Some volatile compounds decreased during storage, whereas others, especially the esters, increased. Concentration of most volatile compounds were higher in pre-stored grapes than in post-stored fruit (thus, during the 30 days after irradiation by e-beam). Consequently, concentration of volatile organic compounds either increased or decreased after e-beam irradiation but these changes did not correlate with irradiation dose.

• Journal of Animal Environmental Science
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• v.8 no.3
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• pp.191-198
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• 2002

This study was conducted to determine changes in internal temperature and chemical composition during the composting of broiler litter(BL) and to evaluate the feasibility of use of a small-scale pelletizer for the pelleting of composted BL. BL was composted for 4 weeks in an wooden cell with a size of 1 m length $\times$ 1 m width $\times$ 1.2 m height. Internal temperature reached to peak(68$^{\circ}C$) at the fourth day and thereafter gradually reduced. Among chemical components in BL, composting reduced organic matter content and increased dry matter and indigestible protein(ADF-CP) contents. When BL was pelleted using an economical small-scale pelletizer, the proper die diameter was 8~18 mm and the proper moisture content of composted BL was 20~25%. Beyond these proper conditions, addition of heat and pressure or pellet aids may be necessary. Pelleting of BL resulted in nearly threefold increase of bulk density, significant moisture evaporation, and little change in chemical components except for increased indigestible protein. In conclusion, BL may be converted into a feed with low to medium nutrition by the composting and pelleting process.

• Journal of Aquaculture
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• v.17 no.2
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• pp.144-150
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• 2004

This experiment was conducted to evaluate the parameters such as nutrient requirements, POY, AnV, Totox, VBN, total plate count, dietary fatty acids and amino acids composition, that are not included in the registered standard composition items required by the Ministry of Agriculture and Forestry, of a moist pellet (MP), three domestic extruded pellets (DEP-1, DEP-2, DEP-3), and two foreign extruded pellets (FEP-1, FEP-2) that are utilized by domestic flounder farms at present. The crude protein was added in excess of the dietary protein requirement in 6 kinds of feeds. When considering the proper PH ratio, it is obvious that protein was added in excess, especially in MP and FEP-2. Crude fat was also added in excess, especially in FEP-1. MP contained a higher dietary phosphorus content than formulated feeds, surpassing the dietary phosphorus requirement and greatly increasing the possibility for causing water pollution. The oxidation of fatty acid and decomposition of protein in MP were higher than in formulated feeds, and may also cause problems on fish farms. Also, it is difficult to store and manage MP, Among the fatty acids, EPA and DHA contents in MP were higher than those in formulated feeds. It is necessary to conduct further studies of EPA and DHA contents in formulated feeds. Lysine content in MP and FEP-2 could meet the dietary lysine requirement of flounder, however, the possibility of insufficient lysine content in the other formulated feeds was high and we considered that extra supplementation was necessary. Therefore, it is necessary to set up quality control standards according to fish species and sizes while considering the specific character of aquatic formulated feeds to restore the confidence of feed companies and aquaculturists to these feeds. This may be an opportunity to make an earlier change from MP to formulated feeds.

• Journal of Practical Agriculture & Fisheries Research
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• v.15 no.1
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• pp.123-130
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• 2013

The present study was conducted to investigate effects of feeding concentrate on development of intestinal tract and composition of muscle in suckling Hanwoo calves before weaning(60 days of age). Twenty-four Hanwoo calves(12 heifers and 12 bulls) at six days of age were randomly assigned to one of three dietary treatments[hay and two levels(low and high) of concentrate feeding] and given each diet with free access to their dams for suckling until 60 days of age. At 60 days of age, two calves from each treatment were used for post-mortem examination of intestine development and chemical analysis of muscle. Feed intake between 31 and 60 days of age was significantly(P<0.05) higher for the high concentrate treatment(532.4g/d) than for other treatments(78.9 and 108.9g/d for hay and low concentrate treatments, respectively). Although feed intake showed a large difference between the low and high concentrate treatments, body weights at birth and 60 days of age were similar between the treatments, suggesting that calves in the low concentrate feeding were supplied more milk from their dams than those in the high concentrate feeding. The ratio of intestine weight to body weight at 60 days of age was increased in the high concentrate(3.35%), compared with those in the hay(2.93%) and low concentrate(3.03%) treatments. The chemical composition of muscle in sirloin and hind leg was not affected by the treatments. In conclusions, the results of the present study showed that feeding concentrate to Hanwoo calves before weaning might stimulate intestine development relative to feeding hay.

• Journal of The Korean Society of Grassland and Forage Science
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• v.40 no.1
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• pp.44-49
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• 2020

This study was conducted to investigate the possibility of replacing imported Timothy hay (TH) with domestic Italian ryegrass silage (IRGS) as a horse feed considering feed quality, nutrient digestibility and feed price. Two experimental diets (TH and IRGS) were fed to six-headed Thoroughbred (body weight, 475.7±33.3kg) of the Korea Racing Authority of Wondang Stud Farm. The 3 head animals were assigned to Control group (TH) and Treatment group (IRGS), respectively. The nutrient digestibility was determined by the total collection method. IRGS is enough for using as a horse feed because its Relative feed value(RFV) was higher than TH and its fermentation quality is suitable for horses. Although no difference was observed in nutrient digestibility, Total digestible nutrients(TDN), and Digestible energy(DE) between Control and Treatment group (p>0.05), the fact that price of IRGS was much lower (53.7~62.4%) than that of TH indicates IRGS has competitive advantage over TH as a horse forage feed. The present study indicates that IRGS can be fully replaced with TH due to its superior economic value even though the similarity of its nutrient digestibility, TDN, and DE to TH.

• Food Science of Animal Resources
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• v.24 no.3
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• pp.209-215
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• 2004

In a trial involving 120 pigs, the growth performance of finishing pigs and proximate composition, physicochemical properites and fatty acid composition of loin muscle were investigated by feeding the high-energy density diet and low-energy density diet. The treatments included feeding 1) the low-energy density diet (3,290 cal/kg DE, 14.50% CP, 0.70% lysine and 0.78% Ca) for 38 days and 2) the hight-energy density diet (3,350 cal/kg ME, 15.0% CP, 0.70% lysine and 0.78% Ca) for 27 days. The average daily gains were significantly higher for pigs fed the high-energy density diet than those fed the low-energy density diet, but average daily feed intake and feed conversion rate were significantly lower than those fed the low-energy density diet (p<0.05). The cooking loss and yellowness of pork were significantly (p<0.05) lower for pigs fed the low-energy density diet than those fed the high-energy density diet. There were no significant differences in carcass characteristics, proximate composition and fatty acid composition of pork. In conclusion, the results of the experiment suggested that the high-energy density diet for pigs tended to improve the growth performance, but the cooking loss and yellowness of pork were higher for pigs fed the high-energy density diet than those fed the low-energy density diet.

• Korean Journal of Agricultural Science
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• v.35 no.2
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• pp.147-153
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• 2008

This experiment was conducted to investigate the feed value of Phellinus linteus meal. The chemical composition and particle size of Phellinus linteus meal was determined, and investigated the effect of partial substitution(0, 5, 10 and 20%) of dried Phellinus linteus meal on metabolizability and serum IgG concentration of layers. Crude fiber content of Phellinus linteus meal was higher, and crude protein and crude fat contents were similar level compare to corn, barley, and wheat. Dry matter metabolizability of Phellinus linteus meal was lower in 10 and 20% treatment than those of 0 and 5% treatment significantly(p<0.05). But, Phellinus linteus meal did not affect concentration of serum IgG.