• Korean Journal of Poultry Science
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• v.30 no.3
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• pp.183-189
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• 2003

This study was carried out to evaluate effect of dietary green tea by-products (GTB) on laying performance and quality of eggs in hens. A total of 96 laying hens (22-week-old) "Tetran Brown" were allotted to four dietary treatments, which containing 0, 2, 4 and 6% green tea-by products. The results showed that the egg production increased (P＜0.05) in layers fed diets containing 4% or 6% green tea-by products compared to the layers fed control no GTB. Egg weight and egg mass in layers fed diets containing 2% green tea by-products significantly decreased compared to those in the other groups (P<0.05). The feed intake was lower in layers fed diets containing 2% and 6% green tea by-products. The feed conversion ratio was lower (P<0.05) in layers fed diets containing 4% or 6% green tea by-product supplementation respectively. The egg shell thickness was no significantly different between layers fed the control and green tea by-product diets (P>0.05). The egg yolk cholesterol tended to decrease when layers fed diets containing green tea by-products, although the differences were not significant (P＞0.05). The linolenic and docosahexaenoic (DHA) acid contents in egg yolk significantly increased in layers fed diets containing different levels green tea by-products compared to those fed control diet (P<0.05). These results suggest that inclusion of green tea by-products in layer diets is suitable for hens without negative effects on egg composition.

• Food Science and Preservation
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• v.17 no.4
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• pp.533-540
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• 2010

Overall composition, and fatty acid, amino acid, and nucleotide-type compound levels in wild (Haliotis gigantea) and cultured abalone (Haliotis discus hannai), were investigated. Wild abalone had a higher moisture content than did cultured abalone, but the converse was true for crude protein content. In overall composition, crude lipid level was higher in the viscera than in the meat, with the greatest level, $2.02{\pm}0.15%$ (w/w), observed in the viscera of wild abalone. The major fatty acids were palmitic acid (16:0), oleic acid (18:1n-9), eicosatrienoic acid (20:3n-3, ETA), eicosapentaenoic acid (20:5n-3, EPA), and docosahexaenoic acid (22:6n-3, DHA). The omega-3 fatty acid content (EPA and DHA) was higher in wild than in cultured abalone. A total of 17 amino acids were detected in all abalone samples, most of which had high levels of aspartic acid, glutamic acid, glycine, and arginine, and low amounts of cysteine, methionine, and histidine. Glutamic acid was the most abundant of all amino acids. The content of free amino acids was related to taste score. The major free amino acids were taurine, alanine, and arginine, of which taurine was the most abundant, and was present at higher levels in wild compared to cultured abalone. The total contents of nucleotide-related compounds in wild and cultured abalone were 12.93 mg/100g and 30.75 mg/100g, respectively.

• Preventive Nutrition and Food Science
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• v.1 no.2
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• pp.220-226
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• 1996

To investigate the effect of long chain n-3 polyunsaturated fatty acids on breast cancer cell growth, estrogen-dependent MCF-7 human breast cancer cells were cultured serum-free DMEM media containing 0.5$\mu\textrm{g}$/ml of differnet kinds of fatty acids; linoleic acid(LA), arachidonic acid(AA), eicosapentaenoic acid(EPA) and docosahexaenoic acid acid(DHA) and 1, 0.1, 0.2, 0.5and 1.0ng/ml 17$\beta$-estradiol as well as 10$\mu\textrm{g}$/mi insulin and 1.25 mg/ml delipidized bovine serum albumin for 3 days. Cell growth monitored by MTT assay was lower in DHA and EPA treatments as compared to LA treatment, but not with AA treatment. Estrogen concentrations at which cell growth was initially stimulated were 0.1ng/ml for LA and DHA treatments and 0.2ng/ml for EPA and AA treatments, but the degree of stimulation was 25~30% lower in DHA and EPA treatments than in LA treatment. Fatty acid analysis showed that each fatty acid in culture medium was well incoporated into celluar lipid. Protein kinase C activity of cells was most elevated in LA treatment from 2 to 8 hours of culture followed by DHA, EPA, and AA treatments. It is concluded that inhibitions of n-3 DHA and EPA on breast cancer cell growth as compard with n-6 LA is mediated via changes in membrane fatty acid composition reducing estrogen sensitivity and increasing protein kinase C activity.

• Korean Journal of Food Science and Technology
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• v.19 no.3
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• pp.181-187
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• 1987

The lipids of ten major fishes caught in Korean seas were analyzed for fatty acid composition and for the content of $\omega-3$ polyunsaturated fatty acids. The major fatty acids present were hexadecanoic acid $(14{\sim}24%)$, hexadecenoic acid $(4{\sim}13%)$, octadecenoic acid $(8{\sim}29%)$, eicospentaenoic acid $(4{\sim}18%)$ and docosahexenoic acid $(6{\sim}33%)$. The ${\omega}-3$ polyunsturated fatty acids ranged from 18% to 48% of the total fatty acids depending on the species. The content of eicosapentaenoic acid was relatively high in sardine, gizzard shad and atka fish on the basic of fresh body weight, while that of docosahexaenoic acid was highest in hair tail and followed by atka fish and sardine.

• Journal of the Korean Society of Food Science and Nutrition
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• v.31 no.2
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• pp.184-188
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• 2002

The fatty acid contents of egg yolk from various chicken eggs such as general egg, ginseng egg, gamgoal egg and docosahexaenoic acid (DHA) egg were analysed during storage at 4$^{\circ}C$ for 3 weeks. The major fatty acids of all egg yolk oils were oleic acid (18 : 1) and palmitic acid (16 : 0). The contents of both fatty acids reached maximum at the first or second week and decreased at the third week. DHA was detected from 4 kinds of eggs stored for 2 or 3 weeks. The n-6/n-3 ratio was obtained under recommended intake range in fresh gamgoal egg and in general and DHA eggs stored far 0~3 weeks. For 3 weeks, polyunsaturated fatty acid / monounsaturated fatty acid/ saturated fatty acid (P/M/S) ratio of DHA e99 did not chance, but that of ginseng e99 gradually increased. The P/M/S ratio was generally maintained under recommended intake range in general egg stored for 3 weeks, in ginseng egg stored for 2 weeks and in DHA egg during all the storage period.

• Fisheries and Aquatic Sciences
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• v.22 no.4
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• pp.8.1-8.9
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• 2019

A 12-week feeding trial was designed to evaluate the effect of total replacement of fish oil (FO) with terrestrial alternative oils on growth, feed utilization, body composition, hematological parameters, and fillet fatty acid profile of mandarin fish juveniles. Four iso-nitrogenous (56% crude protein) and iso-lipidic (13% crude lipid) practical diets were formulated. A control diet contained 6% FO and three other experimental diets were prepared by replacing FO with linseed oil, soybean oil, and lard (designed as FO, LO, SO, and lard, respectively). Each diet was randomly allocated to triplicate groups of 25 fish ($1.8{\pm}0.03g/fish$) in a circular tank. Complete replacement of FO by three tested alternative oils had no remarkable impact on growth performance, feed utilization efficiency, and morphological and hematological parameters of juvenile mandarin fish. However, daily feed intake was found to be significantly higher for fish fed the SO diet compared with those fed the FO and LO diets. Fish fed LO and SO diets exhibited significantly higher levels of the whole body lipid compared to fish fed diet containing FO. Fillet fatty acid composition reflected dietary fatty acid profile. The highest level of ${\alpha}$-linolenic acid, linoleic acid, and oleic acid was observed in fish fillet fed LO, SO, and lard, respectively. Although the eicosapentaenoic acid level of fish fillet fed diet FO was higher than other treatments, no significant difference was found in docosahexaenoic acid content among all dietary groups. The results of the present study clearly demonstrate that the complete replacement of FO in mandarin fish diets is achievable. These findings are useful in dietary formulation to reduce feed costs without compromising mandarin fish growth.

• Food Science of Animal Resources
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• v.44 no.5
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• pp.988-1010
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• 2024

Obesity, as defined by the World Health Organization (WHO), is excessive fat accumulation that can pose health risks and is a disorder of the energy homeostasis system. In typical westernized diets, ω-6 polyunsaturated fatty acids (PUFAs) vastly exceed the amount of ω-3 PUFAs, with ω-6/ω-3 ratios ranging from 10:1 to 25:1. ω-6 PUFAs, such as arachidonic acid, have pro-inflammatory effects and increase obesity. On the other hand, ω-3 PUFAs, including eicosapentaenoic acid and docosahexaenoic acid, have anti-inflammatory and anti-obesity effects. Linoleic acid (LA) and alpha-linolenic acid (ALA) are synthesized in almost all higher plants, algae, and some fungi. However, in humans and animals, they are essential fatty acids and must be consumed through diet or supplementation. Therefore, balancing LA/ALA ratios is essential for obesity prevention and human health. Monogastric animals such as pigs and chickens can produce meat and eggs fortified with ω-3 PUFAs by controlling dietary fatty acid (FA). Additionally, ruminant animals such as feeder cattle and lactating dairy cows can opt for feed supplementation with ω-3 PUFAs sources and rumen-protected microencapsulated FAs or pasture finishing. This method can produce ω-3 PUFAs and conjugated linoleic acid (CLA) fortified meat, milk, and cheese. A high ω-6/ω-3 ratio is associated with proinflammation and obesity, whereas a balanced ratio reduces inflammation and obesity. Additionally, probiotics containing lactic acid bacteria are necessary, which reduces inflammation and obesity by converting ω-6 PUFAs into functional metabolites such as 10-hydroxy-cis-12-octadecenoic acid and CLA.

• YAKHAK HOEJI
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• v.38 no.1
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• pp.57-66
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• 1994

We studied the effect of eicosanoids on the content of energy metabolites and the intrasynaptosomal $Ca^{++}([Ca^{++}]_i)$ concentration in cerebral ischemic rats. An ischemic model was made by bilateral carotid artery ligation (BCAL) and by incubation of synaptosomes under aglycemic and $N_2$ gas bubbling condition. The content of ATP, creatine phosphate and glucose decreased at 15 minutes after BCAL while that of lactate increased in male Wistar rats. Oral administration of EPA(100 mg/ml/Kg/day) or DHA(16 mg/ml/Kg/day) for 6 weeks improved both the decreases and the increase of the cerebral energy metabolites. In addition, the increase of $[Ca^{++}]_i$, under BACL was suppressed by EPA or DHA treatment. When the both Wistar rats and SHR were administered orally with EPA or DHA for 6 weeks, the effect on the increase of $[Ca^{++}]_i$ under ischemia by $N_2$ gas bubbling were protected. From these results, it may be that EPA or DHA treatment were greatly contributed to preservation of ischemic cerebral energy metabolism and $Ca^{++}$ concentration.

• Proceedings of the Korea Society of Poultry Science Conference
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• 2002.11a
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• pp.92-93
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• 2002

In order to study the effect of krill meal on the performance of layer, egg production, feed efficiency, and astaxanthin levels and fatty acid composition in egg yolk was investigated. During 12 weeks of experimental feeding period, dietary krill did not affected the performance of layer. The bird fed krill diet showed a decreased trend of feed consumption. Egg Yolk from birds fed the krill diet contained more astaxanthin and eicosapentaenoic acid(C20：5) and docosahexaenoic acid (C22：6). The results indicated the further research may be required on the reasons for the decreased feed intake.

• Journal of the Korean Home Economics Association
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• v.25 no.4
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• pp.47-55
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• 1987

This study was designed to elucidate the lipid contents, neutral lipids components and fatty acid composition in fresh shellfishes, produced in Korea. Four kinds of shellfishes including sea mussel, short-necked clam, corb shell and and ark shell were selected according to the higher sales order and cheaper retail price at fish markets in Seoul in July 1985. The results abtained were as follows; 1. The average total lipid contents in four shellfishes were 2.3% by wet weight basis. The ratios of neutrial lipid, glycolipid and phospholipid in the total lipid were 51.1 : 4.9 : 44.0 in sea mussel, 66.0 : 3.2 : 30.8 in ark shell, 37.8 : 2.2 : 60.0 in short-necked clam and 54.5 : 2.0 : 53.5 in corb shell, 2. The average value of acid value, iodine value and unsaponifiables contents of total lipids were 1.3, 217.8, 92.0 and 20.3%, respectively. 3. The composition of the neutral lipids were triglycerides, esterified fatty acids, sterylesters, free sterols and monoglycerides in four shellfishes. 4. The major fatty acid composition of total lipids were palmitic, eicosapentaenoic, docosahexaenoic and palmitoleic acids in four shellfishes. The average total unsaturated fatty acids of total lipid were 64.5%, and $\omega$-3 highly unsaturated fatty acids were 27.0%. The average p/s Ratiio were 1.3.