• Journal of the Korean Society of Food Science and Nutrition
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• v.14 no.4
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• pp.391-395
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• 1985

The Retionl Equivalent value and the composition of carotenoids in hen, quail and duck eggs were investigated by thin-layer chromatography. Total carotenoid contents per gram yolk were great in order of hen＞duck＞quail and retinol contents, quail＞duck＞hen. In Retinol Equivalent value, quail showed the highest level and hen showed the lowest level. In hen and quail, the contents of lutein and zeaxanthin of egg yolk were about 75% of their total carotenoid contents and they were about 60% in duck. In all cases, the sum of the concentration of lutein and zeaxantin accounted for more than 60% of the total carotenoid.

• Korean Journal of Agricultural Science
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• v.29 no.2
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• pp.10-19
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• 2002

This study was conducted to investigate the avifauna of Gap stream in Daejeon metropolitan city from September in 2001 to August in 2002. For the monthly change of bird community, survey was carried at study area per each month, the obtained results could be summarized as follows. 1. The observed birds were 12 orders 31 families 83 species and 15900 individuals, 38 species are water bird as Herons, Dabbling ducks, Diving ducks, Rails, Sandpipers & Plovers and 45 species are land bird as Raptors, Woodpeckers, Wagtails, Thrushes, Warblers, Tits, Buntings, Crows. 2. These birds could be divided 29 residents, 29 summer visitors, 18 winter visitors, 7 passage migrants. 3. Among the birds, Chinese Sparrowhawk Accipiter soloensis, Eurasian Sparrowhawk Accipiter nisus, Kestrel Falco tinnunculus are legally protected species as natural monuments in Korea. 4. The major dominant species were Common Teal Anas crecca, Spot-billed Duck Anas poecilorhyncha, Mallard Anas platyrhynchos, Grey Heron Ardea cinerea, Magpie Pica pica, Little Egret Egretta garzetta in order, Gap stream should be appropriate habitats for dabbling ducks and herons. 5. Among the total number of 83 species, the highest number of species was 37 species in February and the lowest number of species was 27 species in June. 6. Among the total number of 15900 individuals, the highest number of individuals was 2899 individuals in December and the lowest number of individuals was 385 individuals in May. 7. Among the monthly species diversity index, the highest number of species diversity index was 2.6207 in September and the lowest number of species diversity index was 2.0716 in January.

• Journal of the Korean Society of Food Science and Nutrition
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• v.40 no.9
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• pp.1328-1332
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• 2011

This study was carried out to investigate changes in epigallocatechin gallate (EGCG) contents and antioxidant activity of duck egg after pressurized soaking in green tea extract. The duck eggs were soaked in different concentrations of green tea extract (10~30%) and subjected to pressures of 0.1~5.0 MPa for 30 min at ambient temperature in a lab model high-pressure rig. After pressured treatment at 5.0 MPa in 30% green tea extract, EGCG content of duck egg white (20 mg/100 g) markedly increased compared to that of untreated sample (0.17 mg/100 g). Moreover, the antioxidant, hepato-protective, and cellular antioxidant activities of duck egg white after pressured treatment at 5 MPa in 30% green tea extract were all higher than those of untreated sample. Our results could have a direct impact on duck egg consumption by increasing consumer awareness of the health benefits of duck eggs.

• The Korea Beekeeping Bulletin
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• s.351
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• pp.52-52
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• 2010

• The Microorganisms and Industry
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• v.19 no.1
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• pp.59-62
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• 1993

• Korean Journal of Poultry Science
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• v.37 no.3
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• pp.229-235
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• 2010

This work was carried out to improve the performance and the carcass yield of Korea native duck (KND) according to crossbreeding KND and broiler duck (BD). Two hundred forty out of crossbred ducks were divided into 4 strains and selected as 120 ducks separated by sex, respectively. Crossbred ducks were native ducks (female)${\times}$native ducks (male), native ducks (female)${\times}$broiler ducks (male), broiler ducks (female)${\times}$native ducks (male), and broiler ducks (female)${\times}$broiler ducks(male) as A, B, C and D, respectively. Broiler duck diet was fed as experimental diet for 0~3 weeks (CP 22.0%, ME 2,900 kcal/kg) and 3~8 weeks (CP 18.0%, ME 3,000 kcal/kg). Body weight of male was high compared to female, and that of B and C was high compared to A and low compared to D at 3 and 8 week (P<0.05). Body weight gain of male was high compared to female at 3~8 weeks and 0~8 weeks, and it was shown as D>C>B>A on body weight gain (P<0.05). In case of feed intake, there was no difference between male and female, and B and C were high compared to A and low compared to D (P<0.05). Male feed requirement was high at 3~8 weeks, and there was significant difference between A and B, C and between B and D. Carcass yield of 4 strains was shown as 70.1%, 70.8%, 73.1% and 71.2%, respectively. Finally, Crossbreeding of KND and BD may improve the performance and the carcass yield of KND.

• Korean Journal of Veterinary Research
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• v.15 no.2
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• pp.263-269
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• 1975

한국산(韓國産) aflatoxin $G_1$의 독성(毒性)을 비교구명(比較究明)하기 위하여, 한국산(韓國産) aflatoxin $G_1$과 표준(標準) Aflatoxin $G_1$을 各各 1포(圃)씩 오리병아리에 경구투여(經口投與)해서 얻은 결과(結果)는 다음과 같다. 1. Aflatoxin $G_1$의 독성(毒性)에 의(依)하여 유발(誘發)되서 간장(肝臟)에 나타난 병리조직학적(病理組織學的) 병변(病變)은 출혈(出血), 지방변성(脂肪變性) 및 경(輕)한 담관세포(膽管細胞)의 증식등(增殖等)이었다. 2. 출혈(出血)은 $75{\mu}g$의 한국산(韓國産) aflatoxin $G_1$의 투여(投與)로 폐사한 오리에서 가장 현저하였다. 담관세포(擔管細胞)의 증식(增殖)은 $75{\mu}g$과 $50{\mu}g$의 aflatoxin $G_1$을 투여(投與)한 경우에 경(輕)하게 나타났다. 3. 독량(毒量)이 같은 경우에도 Aflatoxin $B_1$에 비(比)해 Aflatoxin $G_1$의 병변(病變)이 훨씬 가볍게 나타났다. 4. 한국산(韓國産) aflatoxin $G_1$을 투여해서 발생(發生)된 병변(病變)은 표준(標準) aflatoxin $G_1$을 투여해서 발생(發生)된 병변(病變)과 유사(類似)하였으며, 그 정도(程度)도 비슷하였다.

• Journal of the Korean Applied Science and Technology
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• v.34 no.1
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• pp.132-141
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• 2017

The objective of this study was to determine the influence of dietary metabolic energy (ME) on blood parameters in duck under heat stress. A total of 240 meat ducks Cherry valley (Anas platyrhynchos) were assigned into four treatment groups with a randomized block design for 42 days. The four treatments were: ME 2900 kcal/kg, ME 3000 kcal/kg, ME 3100 kcal/kg, and ME 3200 kcal/kg. Blood lipid profiles was higher in ME 2900 but lower in ME 3100 and ME 3200 than that of ME 3000 (p < 0.05). Blood aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels were higher in ME 3100 and ME 3200 compared those in ME 3000 (p < 0.05). The blood red cell and platelet profiles were increased in ME 3100 and ME 3200, but reduced in ME 2900 compared to those in ME 3000 (p < 0.05). Among blood electrolytes, chloride ($Cl^-$) concentration was decreased in ME 2900 compared to that in ME 3000. Blood gas $PCO_2$ was reduced in ME 2900 compared to that in ME 3000 (p < 0.05). Blood immunoglobulin (IgG) level was reduced in ME 2900 compared to that in ME 3000 (p < 0.05). Level of stress hormone, corticosterone was increased in ME 2900, but decreased in ME 3100 and ME 3200 compared to that in ME 3000 (p < 0.05).

• Journal of the Korean Applied Science and Technology
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• v.34 no.3
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• pp.613-622
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• 2017

The object of this study was to determine the influence of dietary metabolic energy (ME) on ..... A total of 240 meat ducks Cherry valley (Anas platyrhynchos) were assigned into four treatment groups with a randomized block design for 42 days. The four treatments were: ME 2900 kcal/kg, ME 3000 kcal/kg, ME 3100 kcal/kg, and ME 3200 kcal/kg. There was no difference in liver tissue among the treatments. The duodenal villi and crypt depth length decreased by 10.58% in 2900 compared with ME 3000, but there was no difference between 3100 and 3200. Counts of caecal Latobacillus decreased by 9.47% in 2900 compared to ME 3000, but increased by 2.52 and 3.24% in 3100 and 3200, respectively. Total aerobic bacteria, E. coli and Coliform bacteria were increased by 2900 when compared to ME 3000, but there was no difference between 3100 and 3200. HSP $90-{\alpha}$ among the heat shock proteins (HSPs)-mRNA in the liver was reduced by 48.60% in 2900 compared to ME 3000, while 3100 and 3200 showed no difference or increased.

• Journal of Korean Society of Forest Science
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• v.77 no.2
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• pp.229-234
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• 1988

To evaluate potential of VA mycorrhizal fungi for promoting growth of nitrogen-fixing trees and efficiency of fungal inoculation in relation to soil fertility and dual inoculation with bacteria, Alnus firma was grown for six months in pots with steam-sterilized soil after inoculation with Glomus mosseae, and Robinia pseudoacacia was grown in the fumigated field after inoculation with native Glomus sp. and Gigaspora sp. In unfertilized Alnus plants, 27% increase in dry weight(or 18% in height) was observed by Glomus inoculation, while plants inoculated with both VA mycorrhiza and actinomycete(crushed nodule inoculum) showed synergistic effect of 83% dry weight increase over uninoculated plants. In fertilized Alnus plants, mycorrhizal inoculation alone or dual inoculation with actinomycete resulted in depression of height and dry weight of plants. In case of Robinia, dual inoculation stimulated height growth by 23% (or dry weight by 25%) over the control in unfertilized field, while 13% more height growth(or 21% more dry weight) was observed in fertilized field. It is concluded that VA mycorrhizae, especially Glomus mosseae, have a potential for growth enhancement in Alnus, that synergistic effect of dual inoculation(mycorrhiza + actinomycete) exists in both Alnus and Robinia, and that responses of these plants to VA mycorrhiza are more pronounced in unfertilized soil.