An experiment on the rearing of tilapia stocked in closed recirculating tanks eliminating biological filter beds was carried out at the Fish Culture Experiment Station of the National Fisheries University of Pusan, from May 18 through October 21, 1982, and the growth rates, feed conversion, water quality, spawning prevention and space utilization efficiency were discussed. Finally discussed is the feasibility on the establishment of commercial production units. On the water quality, the water temperature ranged from $22.8^{\circ}C\;to\;29.1^{\circ}C$, and total ammonia arround 10 ppm or slightly up. Maintaining phytoplankton bloom was not successful probably because of the active consumption by the heavily stocked tilapia. Several attempts were made by changing the culture water with green water from a nearby earthen pond with results of fading-away in a couple of days. Feed conversions were relatively high ranging from 0.9 to 1.2 except for experiment 1 when the fish were not fully recovered from weakened wintering state. The feed used was partly laboratory prepared $25\%$ protein diet and mostly commercially available $39\%$ protein carp feed. Spawning was completely controlled during the experiment, resulting from density effect, which ranged from 10kg to 40.7kg per square meter with water depth of 0.5 to 0.6m. Space utilization efficiency was very high. Daily net production from the experiment division 3, which showed the highest result, was 6.206 kg per tank, which is calculated 3,235 metric tons per hectare per year, This time, water temperature ranged from 27.8 to $29.1^{circ}C$, average being $28.4^{circ}C$, and total ammonia arround 10 ppm. An estimation for the commercial set-up of the production system based on the results of experiment divisions which had initial stocking rate $15\;kg/m^2$ or up, is made. If the total facility, 8 tanks comprising $56\;m^2$ in surface area, is used for the present study, the yield would become 5,639 kg from 200 day rearing, which would be possible under double sheets vinyl house without additional heating, and it is thought feasible in the economic view point, when 10 or more units are operated.
Journal of the Korean Society of Food Science and Nutrition
/
v.34
no.5
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pp.573-580
/
2005
Cholesterol $7\alpha-hydroxylase$ (CYP7A1) is the rate-limiting enzyme in the conversion of cholesterol to bile acids and plays a central role in regulating cholesterol homeostasis. We previously showed that a fermentable $\beta-glucan$ ingestion decreased plasma cholesterol levels due to fecal bile acid excretion elevation involved inincrease of cholesterol $7\alpha-hydroxylase$ mRNA expression and activity. It is proposed that short chain fatty acids (SCFA) produced by cecal and colonic fermentation of soluble fiber are associated with cholesterol-lowering effect of fiber. In the present study, we investigated whether CYP7A1 expression is up-regulated by short chain fatty acids or by hormones in cultured human hepatoma (HepG2) cells. Confluent HepG2 cell were incubated with acetate, propionate, or butyrate at 1 mM concentration for 24 hrs. Acetate as well as propionate increased to 1.8-fold expression of CYP7A1 mRNA than the control. Butyrate also increased 1.5-fold expression of CYP7A1 mRNA. Our data show for the first time that SCFA increase expression of CYP7A1 mRNA. Adding insulin, dexamethasone and triiodothyronine $(1\;{\mu}M)$ to HepG2 cell increased the expression of CYP7A1 mRNA to $150\%,\;173\%,\;141\%$, respectively. These results suggest that SCFA produced by cecal fermentation stimulate enteric nervous system, in which secreted some neuropeptides may be responsible for change in cholesterol and bile acid metabolism. These findings suggest that SCFA are involved in lowering plasma cholesterol levels due to the up-regulation of CYP7A1 and bile acid synthesis.
Jo, Kyung Uk;Park, Soo Jung;Hong, Seok Chan;Oh, Yeon-Mok;Lee, Sang Do;Kim, Woo Sung;Kim, Dong Soon;Kim, Won Dong;Shim, Tae Sun
Tuberculosis and Respiratory Diseases
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v.62
no.2
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pp.98-104
/
2007
Background: Although there is an increasing incidence of Mycobacterium abscessus pulmonary disease in Korea, the optimal therapeutic regimen has not yet been established and there are no reports of the long-term treatment outcomes. This study examined the long-term treatment outcomes of M. abscessus pulmonary disease. Methods: Twenty-nine patients diagnosed with M. abscessus pulmonary according to the American Thoracic Society criteria and treated from January 1996 to December 2003 were enrolled in ghis study. The clinical characteristics, radiological findings, treatment outcome, and follow up data were analyzed retrospectively. Results: The mean age of the 29 patients was 56.1 (${\pm}13.6$) years and there was a female (22/29) dominance. The chest radiography revealed the nodular bronchiectatic type to be dominant (69%, 20/29). Twenty-seven (93.1%) were prescribed clarithromycin-containing regimens, and injectable drugs, mainly aminoglycosides, were included in the regimen of nineteen patients. The most predominant regimen (48.3%) consisted of clarithromycin and amikacin. The treatment success, failure, and default were achieved in 19(65.5%), 9(31.0%), and 1(3.4%), respectively. The median duration to culture conversion was 42 days (range 15-362) and the median duration of treatment in the success group was 543 days (range 176-1,160). An adjunctive surgical resection was performed in five patients, which resulted in treatment success in two patients. After the completion of treatment, nineteen patients were followed up for a median duration of 931 days (range 230-2,294). Only one (5.3%) patient relapsed 45 days after completing treatment. Conclusion: Treatment with clarithromycin-containing regimens resulted in a successful treatment in approximately two thirds of patients with M. abscessus pulmonary disease. The long-term relapse rate was also quite low.
its digests on the performance of broiler chicks and taurine content in broiler meat. A total of 100 broiler chickens were assigned to five dietary treatments; Control, PM diet(FM), NaOH treated FM diet(NaOH-FM), HN03 treated FM diet(HN03 - FM) and 0.5% synthetic taurine supplemented diet(Taurine). Treated diets were supplemented with FM or FM digests at the level of 5% to the control diet Treated diets were fed during the last 3wks of 6wks feeding. During the finisher period, weight gain of chicks fed FM treatments tended to decrease in general. Feed intakes of FM and Taurine were significantly lower than the control but were not significantly different from NaOH - FM or HN03- PM. Feed conversion rate(feed intake/gain) of NaOH-FM was significantly higher than those of FM and HNOJ - FM but not different from those of the control and Taurine. Taurine content of the control was highest in heart muscle(1482 J1.g/g) followed by leg muscle(778f.lg/g) and breast muscle(79 J1.g/g). Taurine contents of leg and breast muscle were significantly(P< 0.01) affected by treatments but that of heart muscle was not. Taurine content of Taurine treatments was highest in both leg and breast muscle. Taurine content of leg muscle was increased 170"10 by Taurine supplementation, 123% by FM supplementation, 122% by NaOH - FM supplementation and 63% by HNOJ- FM supplementation compared with control. Taurine content of breast muscle of Taurine treatment was 246% higher than the control, but other treatments were not different from the control. In conclusion, supplementation of feather meal at 5% level of broiler diet can enrich taurine content of leg muscle. Chemical treatments of FM were not effective in improving taurine enrichment of broiler meat.
Estimations were made of oxidative susceptibility and fatty acid composition of edible meats of native chickens fed various dietary sources containing ${\omega}-3$ polyunsaturated fatty acids (PUFA). A total of 240 Korean native chickens were divided into 4 groups, placed into 3 replicates per group, and were fed a commercial diet (Control) or one of the three experimental diets containing 10% perilla meal (PM group), 10% perilla meal-5% full fat flaxseed (PM+FS group), or 10% perilla meal-5% full fat flaxseed-1% fish oil (PM+FS+FO group) for 20 days. Final body weight, weight gain, feed intake, and feed conversion rate among the groups were not significantly different. Dietary treatments did not affect the relative weights of liver, abdominal fat, and breast muscle. The leg weight was increased from the feeding of ${\omega}-3$ PUFA sources. The TBA reactive substance in the edible meat was not different with the dietary treatments. The total ${\omega}-3$ PUFA in chickens that were fed diets containing ${\omega}-3$ PUFA sources increased compared to that of the control. The level of longer chain ${\omega}-3$ PUFAs, such as C20:5 ${\omega}3$ and C22:6 ${\omega}3$ in the PM+FS+FO group, was much higher than that of the others. The addition of local ingredients, such as perilla meal with conventional sources, could be used to obtain value-enhanced meat by enhancing ${\omega}-3$ PUFA.
Kim, Dong-Wook;Kim, Ji-Hyuk;Kang, Geun-Ho;Kang, Hwan-Ku;Choi, Ji-Young;Kim, Sang-Ho;Kang, Chang-Won
Food Science of Animal Resources
/
v.30
no.3
/
pp.449-457
/
2010
This study investigated the effects of three kinds of water extract mixtures each with different ratios of A. capillaris, C. sinensis, S. chinensis, and V. coloratum on laying performance, egg quality, blood characteristics, and egg storage stability in laying hens. One hundred and sixty 35-wk-old laying hens (Hy-line brown) were divided into four groups of 10 birds each replicated times four. The treatments involved a basal diet (C, control) or diets containing three kinds of water extract mixtures at 200 ppm (T1, water extract mixture A; T2, water extract mixture B; T3, water extract mixture C). The egg production rate, egg mass, and feed conversion ratio were significantly improved in all treatments compared to those of control (p<0.05). Haugh unit and egg yolk color in all treated groups were significantly improved in comparison with control (p<0.05), but no significant differences were observed for egg shell quality. The content of total cholesterol in blood serum was significantly decreased in all treatments compared to that of control (p<0.05). The blood biochemical parameters of liver and kidney damage were significantly decreased in all treatments compared to those of control (p<0.05). Total antioxidant activity in the blood serum of all treated groups was increased as well. The Haugh unit and malondialdehyde content in the egg yolk during storage were significantly decreased in all treated groups compared to control (p<0.05). Consequently, the dietary supplementation of water extract mixtures of A. capillaris, C. sinensis, S. chinensis, and V. coloratum improved laying performance and egg quality but decreased egg quality deterioration with increased storage. These results suggest that medicinal plant extracts could be used as a feed additive in feed for laying hens.
This experiment was designated to investigate the effects of dietary supplementation with various concentrations of oriental herbal natural extract, Galla Rhois (GR), on growth performance and meat quality on broiler chickens. A total of 80 two-day-old broiler chicks were randomly designated to four groups, GR 0% diet (control), GR 0.10%, 0.25%, and 0.50%-treated diet, composed 20 chicks and fed a standard diet supplemented with GR and monitored the growth performance every 5 days during 30 days. Body weight gain (BWG) in all treated groups was increased compared to control group during overall period, showing significant (P<0.05) increase in GR 0.25% and 0.50% independent on concentration, though all group represented a similar level of feed intake (FI) and feed conversion rate (FCR). In analysis of the crude proteins and fatty acid composition in leg and breast meats in control, GR 0.10% and GR 0.50%, there was no significant difference for crude proteins and fatty acid composition in leg meats among 3 groups. Whereas the crude proteins and fatty acid composition in breast meat in GR 0.50% showed significantly higher than those of control (P<0.05). Furthermore, the composition of a-linoleic acid (C18:3n-3) and conjugated linoleic acid, which are known as anticancer and antioxidative fatty acids, are higher than those of control. These results demonstrate that Galla Rhois appears to improve growth performance, feed efficiency and meat quality on broiler chickens, focusing on potential use as a dietary supplement.
Shim, Young Ho;Kim, Jin Soo;Hosseindoust, Abdolreza;Ingale, Santosh Laxman;Choi, Yo Han;Kim, Min Ju;Ohh, Seung Min;Ham, Hyung Bin;Chae, Byung Jo
ANNALS OF ANIMAL RESOURCE SCIENCES
/
v.28
no.3
/
pp.97-107
/
2017
The present study was conducted to investigate the effects on growth performance, nutrient digestibility, and gut health of broiler chickens when a dietary supplementation of multienzymes was added to diets, containing different energy levels. A total of 480 broiler chickens of similar body weight (Ross 308, 1-day-old) were randomly subjected to four treatments. The dietary treatments included a corn-soybean meal-based diet supplemented with: multienzyme (amylase+protease+ mannanase+xylanase+phytase), 0.05% enzyme, and different energy levels (3010 and 3060 kcal/kg). The experimental diets were fed to the chicks in a mash form for 35 days in two phases (1-21 d, phase I; and 22-35 d, phase II). During the overall period, chicks fed with diets supplemented with multienzymes had a better weight gain (p<0.05) and feed conversion ratio (FCR) than those fed with diets without enzymes. There was no difference in the growth rate and FCR among the chicks fed with diets supplemented with enzymes, even though the dietary energy levels were different. The apparent fecal and ileal digestibility of dry matter, gross, crude protein, calcium, and phosphorus were significantly enhanced (p<0.05). The population of cecal and ileal Lactobacillus spp. was significantly increased (p<0.05), and Clostridium spp. and coliforms were significantly decreased (p<0.05) in diets supplemented with enzymes. Villus height and villus height to crypt depth ratio in the small intestine was also significantly enhanced (p<0.05) in diets supplemented with enzymes. In conclusion, multienzyme supplementation had positive effects on the weight gain of broilers, FCR, digestibility of nutrients, and on the growth of intestinal microbiota.
Yoon, So Won;Lim, Eun Hyouk;Lee, Gyoung Mi;Hong, You Deok
Journal of Climate Change Research
/
v.1
no.3
/
pp.189-203
/
2010
The objective of this study is the estimate of $CO_2$ emissions by the energy consumption of functional technology introduced by classifying energy use in households according to functions as well as energy resources. This study also intends to provide the practical basis data in order to establish specific alternatives for GHG mitigation in residential sector with examining the cause analysis affecting $CO_2$ emission increases from 1995 to 2007. The results of this study show a 6.6% increase in the total $CO_2$ from 60,636 thousand tons in 1995 to 64,611 thousand tons in 2007 by using energy in residential sector. Heating is the greatest $CO_2$ emission sector by use, followed electric appliances, cooking, lighting and cooling. Heating sector shows 56.6% reductions from 71.5% in 1995 and as do cooling and electric home appliances, with a 2.4% increase from 0.6% and a 21.8% increase from 14.2% respectively. To analyze factors resulted in $CO_2$ emissions in residential sector, the relevant indicator change rate from 2005 to 2007 was examined. The results find that population, the number of household, housing areas, family patterns, and family income resulted in the $CO_2$ emissions increase in residential sector from 1995 to 2007. On the other hand, carbon intensity and energy intensity contribute to $CO_2$ reduction in residential sector with -2% and -38.7% respectively because of the energy conversion and the improvement of energy efficiency in electronic appliances. This study can be used as a reference when taken account of the reality and considered the introduction of highly effective measures to increase the possibility of mitigation potential in residential sector hereafter.
Kim, Ki-Hyun;Jeong, Jin-Young;Song, Il-Hwan;Lee, Sung-Dae;Ji, Sang-Yun;Lee, Yoo-Kyong;Nam, Ki-Taeg
Journal of the Korea Academia-Industrial cooperation Society
/
v.19
no.12
/
pp.740-748
/
2018
This study was conducted to investigate the effects of dietary supplementation of enzyme complex (metalloprotease and xylanase) on growth performance, carcass characteristics and meat storability of broiler chickens. The experiment utilized a 2 (basal and low spec diets) ${\times}$ 3 (0, 0.5 or 1 g/kg of enzyme supplementation) factorial arrangement. A total of 360 male Ross broilers were randomly assigned into the following six groups: BD-T0 (basal diet + enzyme complex 0 g/kg), BD-T1 (basal diet + enzyme complex 0.5 g/kg), BD-T2 (basal diet + enzyme complex 1 g/kg), LD-T0 (low spec diet + enzyme complex 0 g/kg), LD-T1 (low spec diet + enzyme complex 0.5 g/kg), LD-T2 (low spec diet + enzyme complex 1 g/kg). Feed and water were provided ad libitum for 42 days, during which time feed intake and body weight were measured at one-week intervals. After the feeding trial, chickens were slaughtered by exsanguination and samples were collected. Feed intake was lower in the enzyme supplemented groups than the non-supplemented groups (p<0.05), as were body weight and gain (p<0.05). Thus, the feed conversion ratio improved in the enzyme supplemented groups relative to the non-supplemented groups (p<0.05). The carcass rate and production index were also significantly improved by supplementation with enzyme complex (p<0.05). Finally, the thiobarbituric acid reactive substances (TBARS) values were lower in the enzyme supplementation groups after 6 storage days (p<0.05). In conclusion, dietary supplementation with enzyme complex including metalloprotease and xylanase improved growth performance, carcass characteristics, and storability of broiler chicken meat.
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