• KOREAN POULTRY JOURNAL
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• v.34 no.11 s.397
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• pp.101-106
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• 2002

1980년대 산란 농가의 케이지는 대부분 A형이 주를 이루었으며, 1990년대에는 정부의 시설자금 지원이 본격화되면서 자동화$\cdot$대형화의 조류를 타고 외국산 직립식 케이지가 국내에 보급되기 시작하였다. 초기 직립식 케이지 설치로 평당 사육수수 증가가 가능했지만 자동화에 대한 지식 부족으로 질병과 생산성이 떨어지는 역효과도 있었다. 10년 이상 직립식 케이지에 적응하다 보니 노하우가 축적되어 대형 농장 위주로 직립식 케이지 설치가 증가하였고, 관리면에서도 안정을 보여주고 있다. 그러나 IMF이후 외국산 케이지를 설치하는 농가도 줄어들었고, 설상가상으로 정부의 시설자금 지원도 중단된 상태여서 외국산 케이지 보급이 소강상태를 보이다 최근에 와서 다시 설치가 증가하고 있다. 이와 관련하여 국내에 보급된 케이지 관리실태와 A/S현황을 알아보았다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.05a
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• pp.561-562
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• 2001

보구치(Argyrosomus argentatus)는 우리 나라의 연안에서 어획되는 상업적으로 중요한 어종이며, 광양만에서는 여름철에 출현하는 자치어 중 중요한 어종이다(Cha and Park,1994). 최근에 보구치에 대하여 분포(Baik et al.,1999)를 비롯하여 성장과 성숙 (Song,1988; Kwon et al.,1999), 산란(Song,1988; Kang et al.,1999), 자원량과 자원관리방안(Zhang et al.,1999a, b)과 같은 연구가 활발하게 이루어지고 있지만, 초기 생활사에 대한 연구는 아직 이루어지지 않고 있다. (중략)

• KOREAN POULTRY JOURNAL
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• v.52 no.5
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• pp.104-107
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• 2020

종계·산란계 유정란 평사 사육공장에서 방란을 최소화하기 위한 자동난상, 슬랫을 국내 기술로 제작·판매하는 (주)동진레벨은 지난 1998년부터 22년간 양계농가에서 사용하기 용이한 제품을 보급하기 위해 달려왔다. 초기 당사에서 출시한 목재난상의 단점을 보완하고자 3여 년간의 연구·개발 끝에 2013년 '사출성형 플라스틱 조립식 자동난상'을 세계 최초로 선보였다. 국내 특허는 물론 세계 국제특허 출원 이후 아프리카 앙골라, 일본, 필리핀 등 세계 각국 수출에 성공하면서 지난해 12월 '100만불 수출의 탑'을 수상하는 영예를 안았다. 끊임없는 연구와 개발, 그리고 매년 세계 각국의 축산박람회 시찰·참관을 통해 국내 양계농가에 보다 우수한 제품을 공급하는 (주)동진레벨 김진술 대표를 찾아 양계산업 발전을 위해 노력해 온 그간의 세월을 들어보았다.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.13 no.2
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• pp.5-7
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• 1977

The sand-eel Ammodytes persona/us GIRARD, one of the important fish species in commercial fishing, is found abundantly around the coast of Korea. The author determined the morphological index of the fish after spawning. The samples were caught by the set-net at Jllmllnjin, located ['I Ihe east coast of Korea. 1. The relation between the total length L and the body weight W is represented as $$ W=O. 00l0114L^{2.7281024} $$ 2 Vertebrae number is represented as 64.597 \ulcorner 1.307

• Korean Journal of Remote Sensing
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• v.25 no.1
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• pp.31-44
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• 2009

The objective of this study was to measure backscattering coefficients of paddy rice using a L-, C-, and X-band scatterometer system with full polarization and various angles during the rice growth period and to relate backscattering coefficients to rice growth parameters. Radar backscattering measurements of paddy rice field using multifrequency (L, C, and X) and full polarization were conducted at an experimental field located in National Academy of Agricultural Science (NAAS), Suwon, Korea. The scatterometer system consists of dual-polarimetric square horn antennas, HP8720D vector network analyzer ($20\;MHz{\sim}20\;GHz$), RF cables, and a personal computer that controls frequency, polarization and data storage. The backscattering coefficients were calculated by applying radar equation for the measured at incidence angles between $20^{\circ}$ and $60^{\circ}$ with $5^{\circ}$ interval for four polarization (HH, VV, HV, VH), respectively. We measured the temporal variations of backscattering coefficients of the rice crop at L-, C-, X-band during a rice growth period. In three bands, VV-polarized backscattering coefficients were higher than hh-polarized backscattering coefficients during rooting stage (mid-June) and HH-polarized backscattering coefficients were higher than VV-, HV/VH-polarized backscattering coefficients after panicle initiation stage (mid-July). Cross polarized backscattering coefficients in X-band increased towards the heading stage (mid-Aug) and thereafter saturated, again increased near the harvesting season. Backscattering coefficients of range at X-band were lower than that of L-, C-band. HH-, VV-polarized ${\sigma}^{\circ}$ steadily increased toward panicle initiation stage and thereafter decreased, and again increased near the harvesting season. We plotted the relationship between backscattering coefficients with L-, C-, X-band and rice growth parameters. Biomass was correlated with L-band hh-polarization at a large incident angle. LAI (Leaf Area Index) was highly correlated with C-band HH- and cross-polarizations. Grain weight was correlated with backscattering coefficients of X-band VV-polarization at a large incidence angle. X-band was sensitive to grain maturity during the post heading stage.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.17 no.6
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• pp.536-542
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• 1984

Fish eggs and larvae in the western waters of Korea are surveyed during the periods from February to August in 1982. Six species of eggs and forty-two species of larvae are occurred in the survey area. The dominant species occurred during the study periods are Ammodytes personatus, Enedrias sp., Engraulis japonica, Callionymus sp., Gobiidae, etc. Major spawning month and ground of each species are estimated from the data, i.e., occurrence month and abundance of eggs and larvae by survey month and area, as well as the optimum water temperature and salinity for spawning.

• Journal of Aquaculture
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• v.16 no.3
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• pp.179-186
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• 2003

Reproductive cycle, gonadal development and the spawning period of the Korean anchovy Coilia nasus were investigated by histologhical observations. Samples were collected at the coastal area of Geumgang dyke which is connected to Gunsan and Janghang, Korea, from February 2002 to January 2003. C. nasus is dioecious; the ovary consists of a pair of saccular structure with many ovarian lobules, and the testis consists of a pair of lobular structure with many testicular lobules and connected to the posterior seminal vesicle. Monthly changes in the gonadosomatic index (GSI) began to increase in April when seawater temperature increased and reached the maximum in June when the ovary was getting mature, the summer season of longer day length with higher water temperature. The reproductive cycle can be classified into five successive stage in females: early growing stage (February to March), late growing stage (March to April), mature stage (May to June), ripe and spent stage (June to July), and recovery and resting stage (July to January): in males, the cycle can be divided into four successive stages; growing stage (February to April), mature stage (May to July), ripe and spent (June to July), and recovery and resting stages (July to January). According to the frequency distributions of egg diameters in the spawning season. C. nasus is presumed to be summer spawning species and polycyclic species to spawn 2 times or more during the spawning season.

• Korean journal of applied entomology
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• v.44 no.3 s.140
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• pp.219-223
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• 2005

Torymus geranii was found to be a ectoparasitoid attacking the larvae of Dryocosmus kuriphilus. T. geranii has longevity of a $42.8{\pm}9.8$ days at $20^{\circ}C$ and $26.5{\pm}11.0$ day at $25^{\circ}C$ under conditions supplied with 100% honeydew. Oviposition numbers at 20 and $25^{\circ}C$ were $22.3{\pm}12.5$ and $42.2{\pm}18.4$, respectively. The eggs were oval in shape, measuring $0.56{\pm}0.33$ mm in length. The larvae, $2.94{\pm}0.18mm$ in length, was white and length of male and female pupae were $2.01{\pm}0.18mm$ and $2.73{\pm}0.09mm$, respectively. T. geranii had two generations with overwintering generation emerged on late May to early June at Chunchon, central part of Korea, however showed three generations with overwintering generation emerged on middle May to early June, the first one on late June to early July, and the second one on late July to earlyl August.

• Development and Reproduction
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• v.12 no.2
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• pp.169-181
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• 2008

Reproductive ecology of the silver pomfret, Pampus argenteus were investigated by histological observations and morphometric data. Samples were collected by the stow net at the coastal area of Jaun-Do, Muan-gun, Korea, from January to December, 2006. P. argenteus is dioecious, the ovary is composed of many ovarian lobules, showing a pair of saccular structure, and the testis is composed of many seminiferous lobules, showing a pair of lobular structure. From February (growing stage) to September (after spawning), monthly changes in the gonadosomatic index, hepatosomatic index, and condition factor in females and males showed similar patterns with the gonad developmental phases. Judging from the results of their indice, it is assumed that spawning in females and males occur from May to July. The reproductive cycle can be classified into five successive stages in females: early growing stage (February to March), late growing stage (March to April), mature stage (March to July), ripe and spent stage (May to July), and recovery and resting stage (July to February); in males, the cycle can be divided into four successive stages: growing stage (February to April), mature stage (March to June), ripe and spent stage (May to July), and recovery and resting stage (July to February). According to the frequency distributions of egg diameters in the breeding season, P. argenteus is presumed to be spring-summer spawning species and polycyclic species to spawn 2 times or more during one spawning season. Number of total eggs in absolute fecundity were proportional to body length and body weight, respectively. Number of total eggs in absolute fecundity per body weight were also proportional to the body length, but if the increase of body weight considerably increased, rather total eggs in relative fecundity decreased with the increase of body weight. Percentage of first sexual maturity of P. argenteus were over 50% in females and males of 12.1 to 15.0 cm in body length, and 100% for fishes over 18.1 cm in length. Therefore, both sexes were regarded to be sexually mature at one year of age.

• Korean Journal of Poultry Science
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• v.36 no.3
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• pp.257-264
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• 2009

This work was conducted to investigate the effects of phytase on N and P excretion of laying hens excreta. Three hundred sixty ISA Brown layers were selected to investigate excreta excretion for 65 weeks and to investigate the effect of phytase on total excretion and N and P excretion of layers from 55 weeks. The experimental diets were fed the starter (0~5 wk), grower (5~12 wk), developer (12~16 wk), prelay diets (16 wk~first egg), layer diets for starting period (first egg~32 wk), middle (32~45 wk), finishing diets (45~55 wk, 55 wk~). Thirty ISA Brown layers were selected to investigate the effect of phytase supplementation on total N and P excretion of layers at 55 weeks and assigned randomly to 3 treatments groups (10 birds/treatment) and phytase was added to basal diets at 300 and 600 FTU/kg. Average body weight, feed intake, water intake, and excreta excretion were 1,622, 105.7, 187.2 and 124.7 g/bird/day, respectively. Excreta of birds fed phytase were DM (33.2, 31.2, 30.5 g/day), N (0.46, 0.42, 0.40 g/day) and P (0.51, 0.49, 0.48 g/day) and reduced as dietary phytase increased, Finally, dietary phyase can reduce the N and P excretion, but the amount of excreta was not different depending from the phytase addition in layers. This work investigated the N and P excretion of laying hens excreta and were considered that dietary phytase can reduce the N and P excretion for short period.