• 한국수산과학회지
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• 제32권1호
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• pp.18-21
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• 1999

본 연구는 넙치 치어 (평균체중 1.6g)의 적정 사료 공급 횟수를 조사하여 경제적이고 수질오염원을 줄이기 위한 먹이 공급 체계를 제시하기 위해 수행되었다. 양어가들이 주로 사용하고 있는 건조 pellet 형태의 상품사료와 습사료 (moist pellet, MP)를 제조하여 각 실험수조 (50$\iota$)에 40마리씩 3 (diet)$\times$5 (feeding regimen)$\times$3 (replication) factorial design으로 수용하여 사육 실험 하였다. 사료 공급은 1일 4회 (06:00, 10:00, 14:00, 18:00), 1일 3회 (06:00, 12:00, 18:00), 1일 2회 (06:00, 18:00), 1일 1회 (06:00) 및 2일 1회 (09:00)로 설정하였다. 3 종류의 실험사료로 넙치 치어를 30일간 사육 실험한 결과, 모든 사료에서 공급 횟수가 낮아질수록 일일사료섭취량은 감소하였으며 (P<0.05),사료 공급 횟수가 동일할 때에도 사료 종류에 따라 사료 섭취량이 달라지는 경향을 보였고, 특히 MP 사료가 다른 두 사료보다 그 섭취량이 낮았다. 성장은 세 사료 모두 1일 3회 공급구는 1일 4회 공급구와 유의적인 차이가 없었으므로 1.6$\~$4g의 넙치 치어의 적정 사료 공급 횟수는 1일 3회가 적당할 것으로 판단된다. 따라서 사료를 불필요하게 자주 공급할 필요가 없을 것으로 보이며, 과다한 사료 공급은 경제적으로나 인력적인 면에서 불이익이 초래될 것으로 판단된다.

• 한국양식학회지
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• 제18권4호
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• pp.231-235
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• 2005

본 연구는 치어기 넙치의 여름철 적정 사료공급 횟수를 조사하기 위해 평균무게 3.7g의 실험어를 300${\iota}$ 원형수조에 각 수조당 80마리씩 3반복으로 무작위 배치하여 사료공급 횟수를 달리하여 6주간 사육하였다. 사료공급 횟수는 2일 1회(09:00), 1일 1회(09:00), 1일 2회(09:00, 18:00), 1일 3회(09:00, 13:00, 18:00) 및 1일 4회(09:00, 12:00, 15:00, 18:00)로 설정하였으며, 매회 실험어가 먹을 때까지 만복공급 하였다. 생존율은 2일 1회 사료공급구가 가장 낮게 나타났으며, 1일 1회 이상의 사료공급구간에서는 유의적인 차이가 나타나지 않았다. 증체율 및 일일사료 섭취율은 사료공급횟수가 증가함에 따라서 증가하였지만, 1일 2회 이상 사료를 공급한 실험구들 간에는 유의한 차이가 없었다. 사료효율 및 단백질 전환효율은 사료공급횟수에 유의한 영향을 받지 않아 모든 실험구간에 차이가 없었다. 사육실험 종료 후, 전어체의 수분, 단백질, 지방 및 회분함량은 모든 실험구에서 유의적인 차이가 나타나지 않았다. 이상의 결과로 볼 때, 3.7${\~}$19.0g 넙치 치어 시기의 여름철(수온 $24^{\circ}C$) 배합사료의 적정공급 횟수는 사육관리 시간 및 비용 등 경제적인 측면을 고려하였을 때 1일 2회일 것으로 사료되며, 이때 사료섭취율은 $2.63{\~}2.78\%$가 적당할 것으로 판단된다.

• 한국수산과학회지
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• 제53권4호
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• pp.551-556
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• 2020

Eel Anguilla japonica is an economically important inland culture fish species in East Asian countries, particularly in Korea, Japan, China, and Taiwan. In this study, the effects of feeding frequency on larval growth and survival rate were investigated. Eel larvae (average length, 6 mm) were fed a slurry-type diet containing shark eggs three, five, seven, or nine times per day. Survival rates differed significantly among the four experimental groups. Feeding frequencies of at least five and seven times a day were required until 15 and 30 days after hatching, respectively, to maintain an acceptable survival rate. Leptocephalus growth improved with increased feeding frequency until 15 days after hatching. The results suggest that providing an opportunity for early food intake enhances eel survival and growth in the early leptocephalus stage.

• 한국양식학회지
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• 제18권3호
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• pp.160-166
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• 2005

평균체중 280 g의 넙치를 대상으로 탄수화물, 단백질 및 지질 함량이 다른 3종류의 EP사료(HC, HP및 HL)를 제조하여, 사료 공급율과 공급휫수를 달리하여 영양소 소화율을 조사하였다. 사료의 공급율에 따른 실험(실험 1)은 파 사료별로 1일 1회 만복 공급구와 만복의 80% 공급구로 설정하였다. 사료 공급횟수에 따른 실험(실험 2)에서는 사료의 공급휫수를 각 사료마다 2일 1회, 1일 1회, 1일 2회 및 1일 3회로 설정하였다. 사료 공급율을 달리한 실험 1에서 넙치의 건물, 단백질, 지질, 에너지 및 NFE 소화율은 사료 조성과 공급율에 영향을 받지 않았다. (P>0.05).사료 공급횟수를 달리한 실험 2리 건물 소화율은 동일한 공급횟수에서 HP 공급구가 HC와 HL 공급구와 비교하여 높은 소화율을 보였다. 단백질 소화율은 사료 조성에 영향을 받아 HP 공급구가 수치상으로 높은 값을 보였으나 실험구간에 유의차는 없었다(P>0.05).지질 소화율은 사료 공급횟수에 영향을 받아 1일 2회와 3회 공급구에서 감소하는 경향을 보였다. NFE 소화율은 사료 조성과 공급횟수에 경향을 받았으며, 동일한 공급횟수에서 1일 3회 공급구를 제외한 실험 구에서 HP 공급구의 소화율이 높은 경향을 보였다. 그리고 동일한 사료에서는 2일 1회에서 1일 2회까지 공급횟수가 증가하면서 NFE 소화율이 낮아지는 경향을 보였다. 에너지 소화율은 동일한 공급 횟수에서 1일 1회 공급구를 제외하고 HP를 공급한 실험구가 다른 실험구에 비해 높았고, HP 공급구들 간에는 사료공급횟수에 영향을 받지 않았다.

• 한국수산과학회지
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• 제53권4호
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• pp.538-543
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• 2020

A feeding trial was conducted to investigate the effect of feeding frequency on the growth performance and body composition of juvenile mandarin fish Siniperca scherzeri. Triplicate groups of fish (initial fish weight, 7.5 g/fish) were fed to apparent satiation at one, two, three or four meals per day for 8 weeks. The results showed that weight gain of fish fed one meal per day was significantly (P<0.05) lower than those fish fed two, three or four meals per day. Feed efficiency of fish fed two meals per day was significantly (P<0.05) higher than other experimental groups. The plasma cholesterol content was significantly lower in fish fed one meal per day than those fed two, three or four meals per day. Consequently, we can conclude that feeding juvenile mandarin fish twice daily to apparent satiation is acceptable and sufficient to achieve good growth and feed efficiency, as fish performance was not remarkably enhanced when feeding increased from two to four times per day.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2011년도 춘계학술대회 논문집
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• pp.71-76
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• 2011

In this paper, we investigate the vibration source of sheet feeding apparatus installed in scanner cover of the digital MFP through frequency analysis. Gearmesh frequency and motor generated frequency were calculated to analyse autospectrum. During driving state, we measure the vibration level. It was found from the signal analysis that gearmesh frequency and motor generated frequency are identified as vibration source.

• 한국수산과학회지
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• 제44권1호
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• pp.58-63
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• 2011

This study investigated the effects of stocking density and feeding frequency (three and five times per week) on the growth of Pacific cod, Gadus macrocephalus. In the first experiment, experimental groups of fish (mean weight $167.8{\pm}41.4\;g$) were reared at three stocking densities (4, 8 and 12 kg/$m^3$) for 16 weeks. The total weight gain was 17.8, 17.1 and 35.4% at 4, 8 and 12 kg/$m^3$, respectively. The specific growth rates, survival rates and feeding efficiency increased with the density, but there were no significant differences (P>0.05). The daily feed intake decreased as the stocking density increased, whereas the condition factors increased with the stocking density (P<0.05). In the second experiment, groups of fish ($194.1{\pm}68.3\;g$) were fed either three or five times a week. The total wight gain was 14.4 and 18.5% for the fish fed three and five times per week, respectively. The specific growth rates of Pacific cod fed to satiation increased with the feeding frequency, although the difference was not significant (P>0.05). The survival rates, daily feed intake, feed efficiency, and condition factors of the Pacific cod were not significantly different (P>0.05). Based on these results, the optimum stocking density for juvenile cod is above 12 kg/$m^3$, and the best feeding frequency is three times a week, under the conditions used in this experiment.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.1315-1318
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• 2004

Each feeding power is transformed 3 phases of KEPCO through SCOTT transformer and operate a electric train in AC Feeding system of electric railway. Nowaday a power conversion system, installed inside the train, generate a harmonics and has a effect on a power quality and it is necessary to install a countermeasures. This report is proposed a new technique to simulate a power system based on frequency model. The result is resonable relatively with a experimental one.

• 한국수산과학회지
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• 제42권3호
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• pp.262-267
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• 2009

Two 15-week feeding trials were conducted to investigate feeding rate and feeding frequency for growth of sub-adult flounder in suboptimal water temperature ($12^{\circ}C$). In the first experiment, duplicated groups of fish (initial mean weight of 279 g) were fed a extruded pellet once a day at the different feeding rates of 0.1, 0.15, 0.2, 0.3% body weight per day (BW/d), and satiation (0.32% BW/d). Weight gain and feed efficiency were increased significantly (P<0.05) with increase in feeding rates from 0.1 to 0.3% BW/d, but there were no significant differences in weight gain and feed efficiency of fish fed the diet between 0.3% BW/d and to satiation. Crude protein content of dorsal muscle of fish fed the 0.1% BW/d diet was significantly (P<0.05) lower than that of the other groups. In the second experiment, duplicated groups of fish (initial mean weight of 281 g) were fed to apparent satiation with a extruded pellet at three different feeding frequencies (one meal every two days, one meal a day and two meals a day). Weight gain, feed efficiency and condition factor of fish fed one meal every two days were significantly (P<0.05) lower than those of fish fed one meal and two meals a day, but there were no significant differences in weight gain, feed efficiency and condition factor of fish fed between one meal and two meals a day. Based on the results of this study, optimum feeding frequency is one meal a day with satiation feeding for growth and feed efficiency of sub-adult flounder (270-350 g) in suboptimal water temperature ($12^{\circ}C$).

• Asian-Australasian Journal of Animal Sciences
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• 제27권9호
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• pp.1319-1327
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• 2014

Two feeding trials were conducted to determine the optimum feeding frequency in growing Korean rockfish, (Sebastes schlegeli) reared at the temperatures of $15^{\circ}C$ and $19^{\circ}C$. Fish averaging $92.2{\pm}0.7$ g (mean${\pm}$standard deviation [SD]) at $15.0{\pm}0.5^{\circ}C$ and $100.2{\pm}0.4g$ ($mean{\pm}SD$) at $19.0{\pm}0.5^{\circ}C$ water temperature were randomly distributed into each of 15 indoor tanks containing 250-L sea water from a semi-recirculation system. A total of five feeding frequency groups were set up in three replicates as follows: one meal in a day at 08:00 hour, two meals a day at 08:00 and 17:00 hours, three meals a day at 08:00, 14:00, and 20:00 hours, four meals a day at 08:00, 12:00, 16:00, and 20:00 hours, and one meal every 2 days at 08:00 hour. Fish were fed at the rate of 1.2% body weight (BW)/d at $15^{\circ}C$ and 1.5% BW/d at $19^{\circ}C$. At the end of 8 wks of feeding trial weight gain and specific growth rate were significantly higher at the fish fed groups of one meal a day and two meals a day at $15^{\circ}C$ and fish fed groups of 1 meal every 2 days at $19^{\circ}C$ were significantly lower than those of all other fish fed groups. Glutamic oxaloacetic transaminase and glutamic pyruvic transaminase of fish fed group at 1 meal every 2 days was significantly higher than those of all other fish fed groups in both experiments. Weight gain, specific growth rate and condition factor were gradually decreased as the feeding frequency increased. The results indicate that growing Korean rockfish 92 and 100 g perform better at $15^{\circ}C$ than $19^{\circ}C$ water temperature. As we expected, current results have indicated that a feeding frequency of 1 meal a day is optimal for the improvement of weight gain in growing Korean rockfish grown from 92 g to 133 g at $15^{\circ}C$ and 100 g to 132 g at $19^{\circ}C$ water temperature.