Earticle

본 연구는 문헌연구를 바탕으로 하여 전통적인 방법으로 풀을 조제하여 배접하는 경우 첨가제가 풀의 성질 및 접착특성에 미치는 영향을 고찰한 결과이다. 본 연구는 향후 회화문화재의 보존처리용 천연접착제 개발을 위한 기초 자료로 제시하고자 한다. 따라서 본 연구에서는 접착제에 첨가제가 미치는 영향을 검토하기 위하여 임원경제지(林園經濟志), 거가필용사류전집(居家必用事類全集), 다능비사(多能鄙事), 죽여산방잡부(竹嶼山房雜部)에서 공통적으로 사용되고 있는 백반과 황랍을, 장황지(裝潢志)와 제민요술(濟民要術)에서 공통적으로 사용되고 있는 석회를 첨가제로 사용하여 그 특성 즉, 점도, pH, 유연성, 박리강도, 항균성, 방미성, 보존성 등을 측정하여 고찰하였다. 그 결과 첨가제 고유의 특성이 풀의 특성에 큰 영향을 미치는 것을 알 수 있었다. 백반은 유연성을 증가시켰으나, 점도, 접착강도, pH는 감소시켰으며, 황랍은 유연성, 점도, 접착강도, pH를 모두 감소시켰으며, 석회는 유연성, 점도, pH, 접착강도를 모두 증가시키는 경향을 나타내었다.

Traditional paste materials and additives for investigation were selected through careful literature survey. We used the immersed glutinous rice flour, soybean as a traditional paste materials and a yellow wax, alum, and lime as additives. The effect of additives on viscosity, pH, adhesive strength, flexibility, antibacterial activities, mildew resistance, and conservation properties were examined. It was found that there was a relationship between the properties( viscosity, pH, and adhesive strength) and the characteristics of additives. Alum increased flexibilty but decreased viscosity, adhesive strength, and pH. Yellow wax deceased flexibilty, viscosity, adhesive strength, and pH. Lime increased flexibilty, viscosity, adhesive strength, and pH. The conservation properties increased by adding all additive. The present work was therefore carried out with the objective of offering the base datum for keeping traditional papers and textiles using traditional paste.

The optical and physical and characteristics of hydrogel ophthalmic lens polymerized with addition of 2,6- difluoropyridine, SiPc(silicon 2,9,16,23-tetra-tert-butyl-29H31H-phthalocyanine dihydroxide) and nanodiamond in the basic hydrogel material were evaluated. In particular, the utility of 2,6- difluoropyridine, SiPc and nanodiamond as a hydrogel ophthalmic lens material was investigated. 2,6-difluoropyridine, SiPc and nanodiamond were used as additives. And also, 2-hydroxyethyl methacrylate, acrylic acid, methyl methacrylate and a cross-linker EGDMA were copolymerized in the presence of AIBN as an initiator. The refractive index of 1.4348~1.4361, water content of 33.30~34.02%, UV-B transmittance of 4.77~67.50%, UV-A transmittance of 1.45~89.19% and visible transmittance of 32.12~92.21% were obtained. The results of hydrogel lens containing 2,6-difluoropyridine (add 5%) showed antibiosis for staphylococcus aureus. The produced copolymer is suitable for hydrogel soft ophthalmic lenses with antibiotic and anti-UV effect.

This study was to investigate effects of different phytogenic feed additives (PFA) in grower finishing pigs with stressed by high stocking density. A total of 84 growing pigs ([Landrace × Yorkshire] × Duroc) with initial body weight (BW) of 28.23 ± 0.21 kg were used for 10 weeks (4 replicate pens with 3 pigs per pen). The dietary treatment consisted of basal diets in animal welfare density (positive control [PC]), basal diet in high stocking density (negative control [NC]), NC + 0.04% bitter citrus extract (PT1), NC + 0.01% microencapsulated blend of thymol & carvacrol (PT2), NC + 0.10% mixture of 40% bitter citrus extract and 10% microencapsulated blend of thymol and carvacrol (PT3), NC + 0.04% premixture of grape seed and grape marc extract, green tea and hops (PT4), and NC + 0.10% fenugreek seed powder (PT5). The reduction of space allowance significantly decreased (p < 0.05) growth performance (average daily gain, average daily feed intake, feed efficiency) and nutrient digestibility (dry matter, crude protein). Also, the fecal score of NC group increased (p < 0.05) compared with other groups. In blood profiles, lymphocyte decreased (p < 0.05), and neutrophil, cortisol, TNF- α increased (p < 0.05) when pigs were in high stocking density. Basic behaviors (feed intake, standing, lying) were inactive (p < 0.05) and singularity behavior (biting) were increased (p < 0.05) under high stocking density. However, PFA groups alleviated the negative effects such as reducing growth performance, nutrient digestibility, increasing stress indicators in blood and animal behavior. In conclusion, PFA groups improved the health of pigs with stressed by high stocking density and PT3 is the most effective.

The use of agricultural by-products, such as corn cobs, has gained significant attention as a sustainable and promising strategy for developing functional feed additives. This study aimed to produce a functional feed additive enriched with xylo-oligosaccharides (XOS) and yeast protein, using corn cobs as the primary raw material. To efficiently convert the xylan in corn cobs into XOS, a recombinant Saccharomyces boulardii strain displaying endoxylanase on its cell surface was constructed. Among six anchor proteins evaluated for their efficiency in endo-xylanase expression, the X-Tir1 strain exhibited the highest enzymatic activity. Simultaneous saccharification and fermentation of pretreated corn cobs using the X-Tir1 strain and commercial cellulase were optimized under various pretreatment conditions, resulting in the production of 15.2 g/L of XOS and 12.8 g DCW/L of yeast protein after 72 h of fermentation with corn cobs pretreated using 2% (w/v) NaOH. This study demonstrates an environmentally sustainable and cost-effective approach to upcycling agricultural byproducts into value-added functional feed additives, thereby improving feed efficiency in fiberbased diets. Additionally, it underscores the applicability of a cell surface display system as a versatile and effective tool for bioconversion processes.

Deoxynivalenol (DON) is the most common mycotoxin contaminant of cereal-based food and animal feed. The toxicity of DON is very low compared to that of other toxins; however, the most prominent signs of DON exposure include inappetence and body weight loss, which causes considerable economic losses in the livestock industry. This review summarizes critical studies on biological DON mycotoxin mitigation strategies and the respective in vitro and in vivo intestinal effects. Focus areas include growth performance, gut health in terms of intestinal histomorphology, epithelial barrier functions, the intestinal immune system and microflora, and short-chain fatty acid production in the intestines. In addition, DON detoxification and modulation of these parameters, through biological supplements, are discussed. Biological detoxification of DON using microorganisms can attenuate DON toxicity by modulating gut microbiota and improving gut health with or without influencing the growth performance of pigs. However, the use of microorganisms as feed additives to livestock for mycotoxins detoxification needs more research before commercial use.

Pig farming is experiencing significant transformations, driven by technological advancements, which have greatly improved management practices and overall productivity. Soundbased technologies are emerging as a valuable tool in enhancing precision pig farming. This review explores the advancements in sound-based technologies and their role in improving precision pig farming through enhanced monitoring of health, behavior, and environmental conditions. When strategically placed on farms, non-invasive technologies such as microphones and sound sensors can continuously collect data without disturbing the animals, making them highly efficient. Farmers using sound data, can monitor key factors such as respiratory conditions, stress levels, and social behaviors, leading to improved animal welfare and optimized production. Advancements in sensor technology and data analytics have enhanced the capabilities of sound-based precision systems in pig farming. The integration of machine learning and artificial intelligence (AI) is further enhancing the capacity to interpret complex sound patterns, enabling the automated detection of abnormal behaviors or health issues. Moreover, sound-based precision technologies offer solutions for improving environmental sustainability and resource management in pig farming. By continuously monitoring ventilation, feed distribution, and other key factors, these systems optimize resource use, reduce energy consumption, and detect stressors such as heat and poor air quality. The integration of sound technologies with other precision farming tools, such as physiological monitoring sensors and automated feeding systems, further enhances farm management and productivity. However, despite the advantages, challenges remain in terms of low accuracy and high initial costs, and further research is needed to improve specificity across different pig breeds and environmental conditions. Nonetheless, acoustic technologies hold immense promise for pig farming, offering enhanced management, an optimized performance, and improved animal welfare. Continued research can refine these tools and address the challenges, paving the way for a more efficient, profitable, and sustainable future for the industry.

The suppressive effect of monensin as an ionophore-feed additive on enteric methane (CH4) emission and renewable methanogenesis were evaluated. To clarify the suppressive effect of monensin a respiratory trial with head cage was performed using Holstein-Friesian steers. Steers were offered high concentrate diets (80% concentrate and 20% hay) ad libitum with or without monensin, galacto-oligosaccharides (GOS) or L-cysteine. Steers that received monensin containing diet had significantly (p < 0.01) lower enteric CH4 emissions as well as those that received GOS containing diet (p < 0.05) compared to steers fed control diets. Thermophilic digesters at 55℃ that received manure from steers fed on monensin diets had a delay in the initial CH4 production. Monensin is a strong inhibitor of enteric methanogenesis, but has a negative impact on biogas energy production at short retention times. Effects of the activity of coprophagous insects on CH4 and nitrous oxide (N2O) emissions from cattle dung pats were assessed in anaerobic in vitro continuous gas quantification system modified to aerobic quantification device. The CH4 emission from dungs with adults of Caccobius jessoensis Harold (dung beetle) and the larvae of the fly Neomyia cornicina (Fabricius) were compared with that from control dung without insect. The cumulative CH4 emission rate from dung with dung insects decreased at 42.2% in dung beetles and 77.8% in fly larvae compared to that from control dung without insects. However, the cumulative N2O emission rate increased 23.4% in dung beetles even though it reduced 88.6% in fly larvae compared to dung without coprophagous insects. It was suggested that the antibacterial efficacy of ionophores supplemented as a growth promoter still continued even in the digested slurry, consequently, possible environmental contamination with the antibiotics might be active to put the negative impact to land ecosystem involved in greenhouse gas mitigation when the digested slurry was applied to the fields as liquid manure.

This study was to investigate the effects of different phytogenic feed additives (PFA) dosage levels in growing- finishing pigs stressed by high stocking density. A total of 72 mix sexed 12 weeks growing pigs ([Landrace × Yorkshire] × Duroc) with initial body weight (BW) of 49.28 ± 4.58 kg were used for 8 weeks. There were 3 replicate pens in each treatment group, with 3 pigs per pen. The dietary treatment groups consisted of basal diets in animal welfare density (negative control [NC]), basal diet in high stocking density (positive control [PC]), PC + 0.04% essential oil (ES1), PC + 0.08% essential oil (ES2), PC + 0.10% bitter citrus extract & essential oil (CES1), PC + 0.20% bitter citrus extract & essential oil (CES2), PC + 0.05% grape pomace extract (GP1), PC + 0.10% grape pomace extract (GP2). The reduction of space allowance decreased (p < 0.05) average daily gain, feed efficiency, and digestibility of dry matter, crude protein, and gross energy. Also, the fecal score of PC groups increased (p < 0.05) compared with other groups. Basic behaviors (feed intake, standing, lying) were inactive (p < 0.05) and singularity behavior (biting) was increased (p < 0.10) under high stocking density. There was no difference in blood profile. However, the supplementation of PFA alleviated the negative effects such as reduced growth performance, nutrient digestibility, and some increasing stress indicators in th blood (cortisol) and animal behavior (biting). In conclusion, the negative effect of high stocking density was most effectively mitigated by the normal dosage of the mixture of bitter citrus extract and essential oil additive (CES1).

Non-antibiotic feed additives stand as a potential alternative for antimicrobial growth promoters, but their effects in the gastrointestinal tract of broiler chicks suffering early infection are poorly understood. This study aimed to investigate the effects of two non-antibiotic feed additives (a postbiotic and a sanguinarine-based phytobiotic) on the gut morphology and body weight gain of broiler chicks challenged with Salmonella enterica serovar Enteritidis (SE). Birds (n = 144) were distributed according to a 2 × 3 factorial in a completely randomized design with the following treatments: non-challenged chicks fed control diet (SHAM-DCO), postbiotic (SHAMPFC), or sanguinarine-based compound (SHAM-SAN) and SE-challenged chicks fed control diet (SE-DCO), postbiotic (SE-PFC), and sanguinarine-based compound (SE-SAN). Birds from each treatment were euthanized at 3-, 7-, and 14-days post inoculation and samples were collected for SE counting and intestinal morphometry. Weight gain was determined at 14 days post-inoculation. Lower (p ≤ 0.05) Salmonella counts were observed in birds fed diets containing PFC at 3- and 7-days post inoculation. SE-challenged chicks showed greater crypt depth (p ≤ 0.05) and lamina propria thickness (p ≤ 0.05) and smaller villus:crypt ratio (p ≤ 0.05) at the different sampling periods. Overall, birds fed PFC or SAN showed decreased lamina propria thickness (p ≤ 0.05), greater villus height (p ≤ 0.05), villus:crypt ratio (p ≤ 0.05), and larger villus area (p ≤ 0.05) compared with those fed the control diet (DCO). SAN supplementation improved body weight (p ≤ 0.05) and weight gain (p ≤ 0.05) until 14 days post-hatch compared with the control diet. Both feed additives (PFC and SAN) improved birds’ response to post-hatch Salmonella Enteritidis infection, evidenced by beneficial changes in gut morphology. These effects highlight the potential of these feed additives to improve gut health of broiler chicks during the initial rearing phase.

The emission of noxious gases is a significant problem in pig production, as it can lead to poor production, welfare concerns, and environmental pollution. The noxious gases are the gasses emitted from the pig manure that contribute to air pollution. The increased concentration of various harmful gasses can pose health risks to both animals and humans. The major gases produced in the pig farm include methane, hydrogen sulfide, carbon dioxide, ammonia, sulfur dioxide and volatile fatty acids, which are mainly derived from the fermentation of undigested or poorly digested nutrients. Nowadays research has focused on more holistic approaches to obtain a healthy farm environment that helps animal production. The use of probiotics, prebiotics, dietary enzymes, and medicinal plants in animal diets has been explored as a means of reducing harmful gas emissions. This review paper focuses on the harmful gas emissions from pig farm, the mechanisms of gas production, and strategies for reducing these emissions. Additionally, various methods for reducing gas in pigs, including probiotic interventions; prebiotic interventions, dietary enzymes supplementation, and use of medicinal plants and organic acids are discussed. Overall, this paper provides a comprehensive review of the current state of knowledge on reducing noxious gas in pigs and offers valuable insights for pig producers, nutritionists, and researchers working in this area.

The purpose of this experiment is to measure the change in the growth rate and the amount of bioactive compounds when additives are added to mushrooms. According to the additive content, Ganoderma lucidum ASI7004, Ganoderma lucidum ASI7071, Ganoderma. meredithae KACC42868 and Ganoderma lucidum ASI7013 mycelial growth rate variation analysis, oriental raisin tree, Siberian ginseng, chestnut shell, apple pomace, and Korean cabbage additive increased mycelial growth by approximately 2.5 times when compared to the control group (MCM medium). The results of analyzing the total amount of polyphenol in mycelia of G. lucidum based on different kinds of additives have shown that the amount of polyphenol increased only in G. lucidum ASI7004 with 2% Korean cabbage additive. However, when other additives are added, the amount of polyphenol turned out to be lower than original G. lucidum and other individual additives. The results of analyzing the total amount of triterpenoid in mycelia of G. lucidum based on different kinds of additives have shown that the amount of triterpenoid increased in G. lucidum mycelia with apple pomace and Korean cabbage additives. Siberian ginseng additive was effective in increasing the amount of triterpenoid only when 4% Siberian ginseng was added to G. lucidum ASI7004, yet the increased amount was not significant. Although the addition of additives turned out to be effective to the growth rate, it was not effective enough towards the amount of bioactive compounds. Further experiments are required.

This study evaluated three inorganic acids(HCl, HNO₃, and H₂SO₄) and three oxidizing additives(H₂O₂, KMnO₄, and K₂S₂O₈) to determine the optimal leaching conditions for an additive-assisted hydrometallurgical process aimed at the efficient and sustainable recovery of lithium from insoluble lithium phosphate(Li₃PO₄). Among the tested conditions, the combination of 0.5 M HNO₃ and 0.01 M H₂O₂ showed the most stable and effective performance, achieving nearly complete lithium leaching. More than 98.5% of Li recovered within 10 min, and extending the reaction time beyond 30 min did not significantly improve the leaching efficiency. Excessively strong oxidizing additives such as KMnO₄ and K₂S₂O₈ caused side reactions or reduced process controllability. These results provide fundamental insights into lithium recovery from insoluble lithium compounds and suggest practical directions for simultaneously improving process efficiency and environmental performance.

In modern society, the core goal of multiple electronic devices is miniaturization and lightening. Therefore, built-in batteries have to be built with higher capacities in smaller spaces. Nowadays, researchers around the world are studying how to make secondary batteries that can be charged and discharged without replacement in order to improve their performance. The most promising research centers around lithium-ion battery technology. Anode materials such as Carbon and Silicon are currently used in lithium ion batteries and have drawn the attention offorward thinking scientists due to their high capacity properties. However, silicon has a volume problem during the charge-discharge process; Silicon can expand up to four times its original size and destroy the structure of the electrodes around it. Therefore, it currently cannot be commercialized. We created an anode electrode by coting Si powder with various materials. The substance used to make the anode electrode increased the conductivity of Ag and helped control the volume change by adding NP-SiO2 (SiO2nano-particles) and HF. We analyzed our sample with STEM (Scanning Transmission Electron Microscope), XPS (X-ray Photoelectron Spectroscopy), XRD (X-ray Diffraction) and made a coin cell with to confirm the electrochemical performance of the coin cell. As a result, our sample had higher rates of conductivity (better than existing Si anode materials) and made many charge/discharge cycles during the performance test.

본 연구는 황동광의 황산침출에 관한 연구로 황산 농도, 침출온도, 첨가제로 과산화수소 및 에틸렌글리콜 첨가에 따른 구리 침출거동을 조사하였다. 침출용액에 과산화수소 및 황산의 농도가 증가할수록 구리 침출률이 증가하였다. 침출온도에 따른 구리 침출률은 30 -60o C에서 상승하였으나, 70 - 80o C에서는 감소하였다. 침출된 구리의 양이 감소하는 결과는 70o C 이상의 온도에서 용액 중에함유된 과산화수소의 분해에 의한 것이었다. 80o C에서 에틸렌글리콜을 첨가하였을 경우 과산화수소의 분해가 억제되어 구리 침출률이 증가하였다. 침출 잔사의 SEM 분석 결과, 에틸렌글리콜을 첨가할 경우 침출 잔사가 다공성의 형태로 변형되는 것을 확인하였으며, 에틸렌글리콜 첨가 시 60o C 이하에서도 구리 침출률이 증가하였다.

The leaching behaviors of copper from chalcopyrite were investigated by sulfuric acid. The leaching of copper was examined according to concentration of sulfuric acid, leaching temperature and addition of hydrogen peroxide and ethylene glycol. The concentrations sulfuric acid and hydrogen peroxide in the leaching solution were increased, the leaching efficiencies of Cu were increased. At 30-60o C, the leaching efficiency of Cu was increased but it was decreased at 70 - 80o C. The results were due to the increasing of hydrogen peroxide decomposition in the solution above 70o C. In the case of ethylene glycol added at 80o C, the decomposition of hydrogen peroxide was decreased and the leaching efficiency was increased. As a result of SEM analysis of leaching residue after leaching, the residue was found to porous form in the case of the ethylene glycol added and then the leaching efficiency of Cu was increased by the increase of surface area under 60o C with ethylene glycol.

폐플라스틱을 재활용하여 실용적이고 경제성 있는 재생복합소재의 개발에 기여할 목적으로 ABS, HIPS, PP 폐플라스틱 단일소재의 기계적 특성 측정 및 SBS 첨가제가 폐플라스틱 재생복합소재의 기계적 특성에 미치는 효과를 연구하였다. 폐플라스틱의 단일 소재별 인장시험 결과 ABS의 인장강도가 HIPS, PP보다 현저히 높았으나 첨가제를 넣은 폐플라스틱 재생복합소재의 인장시험 결과 전반적으로 인장강도의 감소와 연신율의 증가가 관찰되었다. 이러한 사실에 비추어 볼 때 첨가제의 함량에 따라 인장강도 등 다양한 기계적 특성의 조절이 가능함을 알 수 있었고 무엇보다도 플라스틱 사출성형에 투입되는 재생복합소재의 특성 중 아주 중요한 연신율을 향상시키는데 SBS 첨가제의 효과가 현저함을 알 수 있었다. 첨가제의 함량대비 인장강도의 감소효과는 ABS에서 가장 현저하게 관찰된 반면 첨가제에 의한 연신율의 향상효과는 HIPS에서 가장 두드러졌다. 이는 ABS 자체의 우세한 결정성이 고무질을 띈 SBS의 첨가로 인해서 광범위하게 무정형화 된 결과 폐플라스틱 입자들 사이의 전단 응력이 감소하기 때문인 것으로 간주된다. HIPS의 경우 첨가제 함량이 증가함에 따라 연신율의 증가 정도가 매우 현저한 특성에 비추어 HIPS가 사출성형에 적합한 재생플라스틱의 물성을 제어하는데 가장 바람직한 소재인 것으로 판단된다.

Effects of polymer additives on mechanical properties of recycled plastic waste components (ABS, HIPS, and PP) were individually studied. Although tensile stress of ABS was higher than those of HIPS and PP with and without additives, polymeric SBS additives improved elongation of the individual plastic component. Elongation of HIPS was most significantly enhanced, in spite of the compromised tensile properties, and it is regarded as the most promising raw material in injection molding, by which most of the contemporary plastic goods are fabricated. On the other hand, reduction of tensile stress was most distinctively observed for ABS and this is attributed to the polymeric nature of the SBS additive which is presumed to convert dominantly crystalline structure of ABS into amorphous one.

분쇄공정에서 분쇄효율의 향상 및 분쇄에너지의 저감을 위한 수단으로 분쇄조제의 사용은 매우 유용하고 경제적인 방법으로 대두되고 있는데, 본 연구에서는 활석 분쇄공정에서 다양한 종류의 분쇄조제에 대한 분쇄효율 및 분쇄에너지의 변화를 고찰하여 최적의 분쇄조제 및 첨가량 등을 도출하고자 하였다. 분쇄조제로 메틸알콜, 인산나트륨, 에틸렌글리콜, 트리에탄올아민, 벤조산, 칼슘스테아레이트 등을 사용하였는데, 메틸알콜을 제외한 모든 분쇄조제를 사용할 경우 현저히 분쇄효과가 향상되었으며, 분쇄에너지로 30～70%까지 저감이 가능함을 확인할 수 있었다. 이러한 결과는 실제 비금속광물 분체 제조 공정에 적용이 가능할 것으로 기대된다.

The ultrafine grinding of talc with various additives was carried out using attrition ball mill with a laboratory scale. The additives used in dry and wet base ultrafine grinding processes were methyl alcohol, sodium diphosphate, ethylene glycol, triethanol amine, benzoic acid and calcium stearate. All of experiments were carried out by batch operation. The variations of median size of products with grinding time were measured by particle size analyzer. The energy consumption was calculated by using torque meter. The results showed that all of additives except for methyl alcohol were satisfactorily effective for the ultrafine grinding of talc. The energy consumption was reduced from 30% to 70%.

본 연구는 분만전후 40두의 젖소에 무첨가, Aspergillus oryzae(T2), Saccharomyces cerevisiae 혼합제(T3) 및 효소분비촉진제(T4) 급여시 사료섭취량, 산유량 혈중대사물질 및 대사성 질병에 발생에 미치는 영향을 구명하기 위하여 완전임의배치법 10반복으로 수행하였다. 주요 연구결과는 다음과 같다. 분만전 건물섭취량은 처리간에 별 차이가 없었지만 분만일과 분만후 3주 동안에는 Aspergillus oryzae, Saccharomyces cerevisiae 혼합제 및 효소분비촉진제를 급여했을 때가 대조구보다 다소 많았다. 산유량은 사료첨가제를 급여한 구가 무첨가구보다 더 높았으며 특히 효소분비촉진제에서 산유량이 가장 높았다. 혈중 글루코스 및 NEFA 함량은 분만전에는 처리간에 큰 차이가 없었지만 분만일과 분만후 1, 2 및 3일에는 사료첨가제 급여구에서 대조구보다 혈중 글루코스 함량은 더 높고 반면에 NEFA 함량은 더 낮았다. 혈중 Ca 수준은 시험기간동안 처리간에 차이가 없었다. 대사성질병 발생은 대조구에서만 케토시스 1두 발생하였으며, 후산증체는 효소분비 촉진제구는 전혀 발생하지 않았으나 다른 구에서는 공히 2두가 발생하였다. 자궁 내막염은 T2구에서 1두 발생하였다.

The objective of this study was to evaluate a feed additives used mainly in lactating cow diets in transient pregrent cow diets. The study was conducted as a completely randomized design with forty Holstein pregnant cows to determine the effect of feeding Aspergillus oryzae(T2), Saccharomyces cerevisiae mixture(T3) and enzyme(cellulase, xylanase) - releasing chemicals(ERC) (T4) on the dry matter intake, milk yield, milk composition and metabolic disorders. Dry matter intake was similar among treatments for 3 weeks prepartum but cows fed enzyme tended to increased feed intake compared to no additives treatment both in calving day and for 3 weeks postpartum. Cows fed Aspergillus oryzae, Saccharomyces cerevisiae and ERC produced more milk than those fed no additives. However, there is no significant difference among treatments. Concentration of glucose was not significantly different among treatment prepartum but that in plasma of cows fed ERC was higher at calving and 3 weeks postpartum compared to others. Increase in NEFA began at 3 weeks prepartum and accelerate during the final 7 days before calving at all treatments but lower for ERC-treated cows at calving and 3 weeks postpartum. Ca concentration not different among treatment prepartum and postpartum. Corticoid content decreased significantly for cows fed ERC compared to those fed non-additives. Metabolic disorder was not occurred in cows fed ERC. However, ketosis and displased abomasum were happened 1 cow when fed non-additives, metritis 1 cow when fed Aspergillus oryzae and retained placenta 1 cow in all treatments except cows fed ERC.