• 제목/요약/키워드: Commercial Farm

검색결과 274건 처리시간 0.023초

닭 Mycoplasma gallisepticum 6/85 생균 백신의 효능 평가 (Evaluation of efficacy of Mycoplasma gallisepticum 6/85 live vaccine)

  • 윤희준;강정무;김길동;신은경;정용운;정지혜;한태욱
    • 대한수의학회지
    • /
    • 제46권3호
    • /
    • pp.207-214
    • /
    • 2006
  • Mycoplasma gallisepticum (MG) continues to persist in many commercial layer farms in Korea,resulting in losses in egg production. Bacterins and live attenuated vaccines have been used for the prevention of losses caused by MG. One of these attenuated vaccines, MG 6/85 vaccine has been reported to be safe and efficacious in layers. However, MG 6/85 vaccine has not been evaluated for its safety and its efficacy in any commercial layer in Korea. Six-week-old specific pathogen-free (SPF) chickens were vaccinated with MG 6/85 vaccine by aerosol and were challenged with virulent MG R strain at 4 weeks after vaccination. The vaccinated group was able to resist challenge into the air sacs because the vaccinated group showed much less air sac lesion compared with the unvaccinated group. Each of two commercial layer farms was divided into vaccinated and unvaccinated groups. For each vaccinated gorup, MG 6/85 vaccine were sprayed at 17 week old on farm A and at 15 weeks old on farm B. Hen-day egg production, Hen-housed eggs, egg weight, mortality were evaluated until 50 week after vaccination.Compared with the unvaccinated group in each farm, the vaccinated group showed higher average egg production and egg weight, and higher hen-housed number. Results of this study are in agreement with other previous reports which demonstrated that MG 6/85 vaccine favorable effect on performance in commercial layers.

부유식 파력발전단지 조성을 위한 계류선 초기설계 (Preliminary Design of mooring line in floating wave energy farm)

  • 정동호;송제하;신승호
    • 한국해양공학회지
    • /
    • 제27권6호
    • /
    • pp.16-21
    • /
    • 2013
  • In this paper, the mooring system for a floating wave energy farm is designed based on a two-dimensional analysis. The mooring system uses an anchorless mooring line linking two floaters in a floating wave energy farm. The basic equation to determine the length of the mooring line between the two floaters is proposed. The other properties such as the diameter and pretension are taken from the mooring line for a single floater. The dynamic behavior and safety of the designed mooring system under extreme ocean conditions are analyzed with the commercial software Orcaflex. A numerical study shows the stability and high safety in tension of the designed mooring lines for a floating wave energy farm. The proposed anchorless mooring system for a floating wave energy farm results in a considerable reduction in the length of the mooring line, contributing to the economics of a floating wave energy farm.

농업기계 요소의 스트레인 게이지 응용에 관한 연구 (Applications of Strain Gages to Farm Machine Elements)

  • 류관희;정창주;고학균;최재갑;유수남
    • Journal of Biosystems Engineering
    • /
    • 제5권2호
    • /
    • pp.40-57
    • /
    • 1980
  • The aim of this study was to promote extensive use of strain gage for accurate measurement in the area of farm machinery research. The results are summarized as follows. 1. Although many strain gate transducers commercially available such as load-cells , accelerometers and pressure transducers have been used in the area of farm machinery research, many types of transducers had to be developed due to the inadaptability or high cost commercial transducers, in many instances. 2. A strain -gaged cantilever beam could be used as a good educational material to demonstrate the methods of Wheatstone bridge arrangement, calibration and theoreticval computation. A ring type load-cell and shaft torque transducer also could be used for the same purpose. 3. The torque and angular speed transducers for an auto-feed thresher and the displacement and pressure transducers for a rice whitener were made and gave satisfactory results. 4. Based on the above results, it is possible to develop simple and low-cost transducers to measure displacement, angular speed , torque and pressure of farm machine elements.

  • PDF

Coating using chitosan as a means to prevent dispersion of moist pellet feed in water of aquacultural farm, and bacterial pollution and its lipid oxidation during storage

  • Lee, Ki-Wan;Jeon, You-Jin;Heo, Moon-Soo;Song, Choon-Bok;Ha, Jin-Hwan;Kim, Se-Kwon
    • 한국어업기술학회:학술대회논문집
    • /
    • 한국어업기술학회 2001년도 추계 수산관련학회 공동학술대회발표요지집
    • /
    • pp.149-150
    • /
    • 2001
  • A fish feed being used most widely in aquacultural farm is a moist pellet (MP) feed which has been being prepared by mixing of commercial dry feed and nutritional oil to raw fish ky. The two major problems in the use of MP feed is to be readily dispersed in water of an aquacultural farm, and to cause lipid oxidation and bacteria infection during storage. The former induce an environmental pollution of the farm and the latter lower nutritional values and develop fish diseasees. (omitted)

  • PDF

풍력단지 제어를 위한 생산가능 출력에 대한 연구 (Study on the Available Power of a Wind Turbine for Wind Farm Control)

  • 오용운;백인수;남윤수;라요한
    • 한국태양에너지학회 논문집
    • /
    • 제34권1호
    • /
    • pp.1-7
    • /
    • 2014
  • A study on the available power of a wind turbine to be used for wind farm control was performed in this study, To accurately estimate the available power it is important to obtain a suitable wind which represents the three dimensional wind that the wind turbine rotor faces and also used to calculate the power. For this, two different models, the equivalent wind and the wind speed estimator were constructed and used for dynamic simulation using matlab simulink. From the comparison of the simulation result with that from a commercial code based on multi-body dynamics, it was found that using the hub height wind to estimate available power from a turbine results in high frequency components in the power prediction which is, in reality, filtered out by the rotor inertia. It was also found that the wind speed estimator yielded less error than the equivalent wind when compared with the result from the commercial code.

복잡지형에서 난류강도를 고려한 풍력발전단지설계 (Wind Farm Design Considering Turbulence Intensity on Complex Terrain)

  • 박미호;고경남;허종철
    • 한국태양에너지학회 논문집
    • /
    • 제33권6호
    • /
    • pp.1-11
    • /
    • 2013
  • The investigation on wind farm design using CFD technique was carried out to reduce turbulence intensity in a wind farm. A potential wind farm in Gasiri of Jeju Island was selected for the design and the commercial S/W of Meteodyn WT was used for applying CFD technique. The initial layout of wind turbines was derived using WindPRO which is mainly used for wind farm design in Korea. Then, the distribution of turbulence intensity on complex terrain was calculated and visible by Meteodyn WT. Based on the distribution, wind turbines were positioned properly. As a result, wind turbines could be deployed at positions with minimum turbulence intensity as well as maximum Annual Energy Production, AEP, using Meteodyn WT. It is necessary to take into account turbulence intensity in wind farm design to avoid wind turbine failure.

새만금 가력도 풍력발전단지에 대한 연간발전량 예측 및 검증 (Prediction and Validation of Annual Energy Production of Garyeok-do Wind Farm in Saemangeum Area)

  • 김형원;송원;백인수
    • 풍력에너지저널
    • /
    • 제9권4호
    • /
    • pp.32-39
    • /
    • 2018
  • In this study, the annual power production of a wind farm according to obstacles and wind data was predicted for the Garyeok-do wind farm in the Saemangeum area. The Saemangeum Garyeok-do wind farm was built in December 2014 by the Korea Rural Community Corporation. Currently, two 1.5 MW wind turbines manufactured by Hyundai Heavy Industries are installed and operated. Automatic weather station data from 2015 to 2017 was used as wind data to predict the annual power production of the wind farm for three consecutive years. For prediction, a commercial computational fluid dynamics tool known to be suitable for wind energy prediction in complex terrain was used. Predictions were made for three cases with or without considering obstacles and wind direction errors. The study found that by considering both obstacles and wind direction errors, prediction errors could be substantially reduced. The prediction errors were within 2.5 % or less for all three years.

Nutritional Approaches for Improving Neonatal Piglet Performance: Is There a Place for Liquid Diets in Commercial Production? - Review -

  • Odle, J.;Harrell, R.J.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제11권6호
    • /
    • pp.774-780
    • /
    • 1998
  • This report includes an extensive bibliography of research articles investigating various facets of rearing neonatal piglets using liquid diets, and includes historical publications dating back to the 1940's. However, in order to provide concise and timely focus for application in modem swine production, only a selected number of recent findings are reviewed in detail. Collectively, the data presented illustrate that growth of piglets fed liquid diets can greatly exceed that of littermates fed dry diets and can even exceed growth rates of sow-reared controls (by up to 160%). The central questions that remain unanswered are: 1) Can this improved performance be obtained routinely and economically under applied farm conditions? and if so, 2) Does improved growth during the early-weaning period translate into improved net economic returns overall? Unfortunately, due to the current practical management constraints related to liquid-diet feeding (i.e., lack of an easy-to-manage feed delivery system), limited data are available which examine the efficacy of liquid-diet feeding under practical, commercial farm conditions.

경남 중부지역에서의 Latex응집반응을 이용한 돼지 톡스플라즈마병 항체분포 조사 (Survey on the Distrributions of Swine Toxoplasma Antibodies by Latex Agglutination Test in Gyeongnam Central Area)

  • 이병훈;황보훈;변유성;이순선;김차용;서명득
    • 한국동물위생학회지
    • /
    • 제15권2호
    • /
    • pp.174-183
    • /
    • 1992
  • This study was conducted to determine the serum antibodies against toxoplasma in swine from breeding-pig farm, pig farm and abattoir by latex agglutination(LA) test. LA test was carried out with commercial Toxo-MT kit (Eiken chemical co.). The results obtained were summerized as follows : 1. The cut-off titer of positive and negative reactions by Toxo-MT antigen used in this experiment was determined as the serum dilution of 1 ; 32. 2. positive rates of toxoplasma antibodies in 823 swine sera were 17.0%(140 cases) by LA test. 3. The toxoplasma antibody detection rates against 194 swine sera in breeding-pig farm, 273 swine sera in pig farm and 356 swine in abattoir were 46.9%(91 cases), 8.4%(23 cases) and 7.3% (26 cases) , respectively. 4. In LA test serum antibody titers in 823 test sera were shown as 51 cases (36.4%) in 1 : 32, 40(28.6%) in 1;64, 17(12.1%) in 1:128, 14(10.0%) in 1:256, 10(7.1%) in 1:512, 5(3.6%) in 1:1,024, and 3(2.1%) in 1 : 2,048. 5. Positive rates of toxoplasma antibodies in swine sera from each breeding-pig farm were 20.0∼61.9%.

  • PDF

The Genetic Development of Sire, Dam and Progenies and Genotype ${\times}$ Environment Interaction in a Beef Breeding System

  • Bhuiyan, A.K.F.H.;Dietl, G.;Klautschek, G.
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제17권1호
    • /
    • pp.13-17
    • /
    • 2004
  • The aim of this study was to investigate genetic development and genotype${\times}$environment interactions (GEI) in postweaning body weight of fattening bulls at the end of test period (WT-T) under various beef fattening environments. Data on a total of 24,247 fattening bulls obtained from the industrial farm, breeding farms and testing stations were used. Heritability estimates for WT-T in all environments were nearly similar. Significant genetic developments of sire, dam and progenies for WT-T were observed in all environments. However, many differences in annual genetic developments between the environments were significant. The genetic correlations for WT-T between industrial farm and breeding farms, industrial farm and testing stations and breeding farms and testing stations were respectively 0.004, 0.004 and 0.013. These low estimates of genetic correlations and significant differences in genetic developments among environments clearly show the existence of GEI for WT-T among various fattening environments. Results of this study indicate the need for environment-specific genetic evaluation and selection of beef bulls for commercial beef production.