• Feed Journal
• /
• v.4 no.8 s.36
• /
• pp.114-118
• /
• 2006

살모넬라 갈리나륨(Salmonella gallinarum)이 원인체인 가금티프스는 모든 품종의 닭에서는 물론이고 어린 일령의 병아리에서부터 산란중인 성계에 이르기까지 전 일령의 닭에서 높은 폐사를 일으키는 세균성 질병으로 우리나라뿐만 아니라 세계적으로 발생되고 있는 질병이다.

• Korean Journal of Poultry Science
• /
• v.41 no.2
• /
• pp.99-104
• /
• 2014

The objective of this study is to analyze the production of extra-large egg and assess the impacts of exogenous factors in feeding the layer chicken. The main results of this study are as follows; First, feeding rations on the basics of statistics, internal maximum and minimum temperature and, the age at first egg affect the production of extra-large egg. Second, implicating the standardized coefficients from the conclusion of regression model estimating suggest that the amount of feed has the greatest impact on production followed by the age at first egg. Third, by using the elasticity of output and the volatility in the production, the result suggest that among the independent variable factors in the external volatility, the biggest one goes to feed ration, and the age at first egg follows. In order to control the production volatility in the extra-large egg production of the farms, it is necessary to manage an efficient feeding based on feed ration, age at first egg and, the maximum and minimum temperature inside the farm. Taken together, the results demonstrates that it should be concentrated by controlling the exogenous factors affecting extra large egg production and the management system construct, to increase extra-large egg production and the income of farmers at the same time.

• Korean Journal of Ichthyology
• /
• v.18 no.4
• /
• pp.363-367
• /
• 2006

The maturity and spawning of brown sole, Pleuronectes herzensteini were investigated using samples randomly collected in the East Sea of Korea from April, 2003 to March, 2004. We analyzed monthly changes in maturity stages, gonadosomatic index (GSI), egg diameter, fecundity (F), total length (TL) at 50% group maturity, and sex ratio. The spawning period was February to May, and the main spawning period was March to April. The fecundity was 38,702 eggs at 22 cm (TL) to 133,085 eggs at 37 cm (TL), and the relationship between TL and F was $F=11.307TL^{2.628}$. The TL at first maturity was 15 cm and at 100% maturity, 21 cm. Thus, TL at 50% group maturity was estimated to be 17.8 cm, which corrensponded to the age of 3 years. The sex ratio was 60.2 for female and 39.8 for male, where the female population was seen to be slightly predominant.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
• /
• v.18 no.2
• /
• pp.104-109
• /
• 2013

The spawning characteristics of Hexagrammos agrammus and Hexagrammos otakii was directly observed in coastal regions of the Yellow Sea and South Sea during the spawning seasons using scuba diving. The territorial male H. agrammus showed different body size, nuptial coloration and nest location compared to those of H. otakii, even though both species caring egg masses were found at the almost same depths. In the West sea, a relatively small guardian H. agrammus male protects 1-2 egg masses laid on a clump of red algae within his territory. The territorial males in red nuptial coloration and their egg masses were well camouflaged in their surroundings. Contrary to H. agammus, a guardian H. otakii male in yellowish nuptial coloration protects 4-8 egg masses in a nest. In addition, their nests were located on the relatively open environments such as discarded fishing nets, rock crevices and a clump of algae. The results of present study shows that even though both of two species belonged to Hexagrammidae, they have different strategies for spawning and protecting their egg masses.

• Proceedings of the Korea Society of Poultry Science Conference
• /
• 2003.11a
• /
• pp.101-102
• /
• 2003

This experiment was conducted to investigate the effect of restricted feeding to pullet on growth pattern and body composition. Conventional diets(C) was formulated by NRC recommendation, and one of restricted diet started from seven to seventeen week of age(T1), and another started from twelve to seventeen(T2) with adjusted eighty percentage amount of conventional diet. Body weight decreased with starting restriction of feeding comparing to the C(P＜0.05), but reached to similar weight in all treatments at twenty week regardless restriction. All of birds started to lay egg around 1,400 to 1,450gram of body weight though the age was in order of C, T2 and T1. Fat contents of restricted group in the body were less than that of C around one thousand gram of body weight. And the tendency of body fat was similar to the first egg. After twenty week, all content of body composition were similar in all treatments. The proportion of intestinal organ weight was higher in T1 than others during restriction.

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

• Proceedings of the Korean Aquaculture Society Conference
• /
• 2004.05a
• /
• pp.356-357
• /
• 2004

• Proceedings of the Korean Society of Applied Entomolohy Conference
• /
• 2002.05a
• /
• pp.114-114
• /
• 2002

• Polymer Science and Technology
• /
• v.24 no.6
• /
• pp.574-578
• /
• 2013

• Monthly Korean Chicken
• /
• v.6 no.11 s.65
• /
• pp.2-7
• /
• 2000

닭고기 수출대책협의회 운영규정(안) 확정 - HACCP 워크? 개최 - 살처분 가축보상금 지급요령 개정 - 닭뉴캣슬병 살처분 보상요구 확대 - 미국, 2000년 상반기 육계수출 호조 - 태국, 닭고기 업계 반미감정 고조 - 미 아틀란타 양계 박람회 및 계육산업 시찰단 모집 - 일본, 닭고기 산업 세미나 개최 - 계정육업체, 산란노계 구매 사실상 포기 - 2000년, 일본의 육계생체평균 생산비는 182엔