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양병훈 ( Byung-hun Yang ),심항섭 ( Hang-sub Shim ) 한국동물위생학회 2016 한국동물위생학회지 (KOJVS) Vol.39 No.1
Protozoan parasite, the genus Eimeria, causes an intestinal disease, coccidiosis, in young broilers. Coccidiosis induces significant economic loss in poultry production. This study was designed to identify the prevalence of Eimeria spp. in broilers in Gyeonggi province, Korea. Fecal samples from broilers at 94 farms were collected in two chicken slaughterhouses between March and June 2015. Eimeria infection was determined by microscopic examination and PCR using ITS-1 region. The prevalence of Eimeria was 58.5% (55 of 94). E. acervulina was identified in 96.4% of samples, E. tenella in 81.8%, E. maxima in 12.7%, E. praecox in 12.7%, E. brunetti in 5.5%, E. necatrix in 1.8%, and E. mitis in 1.8%. Body weight (BW) of broilers infected with both E. tenella and E. acervulina (mean=1.53±0.19B kg) was significantly lower than broilers with E. acervulina positive/E. tenalla negative (mean=1.74±0.07A kg) or Eimeria negative (mean=1.65±0.15A kg) (Duncan’s multiple range test, P<0.01). High prevalenceof Eimeria tenella and the impact on the broiler body weight shows the importance of this protozoa in broiler industry. Development of the periodic monitoring strategy and systemic management for the purpose of the prevention/eradication of Eimeria infection among broilers is required.
양돈장 살모넬라 혈청 양성율과 도축돈 살모넬라균 분리율의 상관관계 및 분리 균주의 항생제 내성
김경언 ( Kyung Eon Kim ),안종민 ( Jong Min An ),양병훈 ( Byung Hun Yang ),박영희 ( Yeong Hee Park ),박미영 ( Mi Young Park ),정준용 ( Joon Yong Jung ) 한국동물위생학회 2014 한국동물위생학회지 (KOJVS) Vol.37 No.4
Salmonella spp. are one of the most common bacteria that causes heavy losses in swine industry and have implications for public health. In this study, the correlation between Salmonella seroprev-alence on farms and the isolation rate from slaughtered pigs was analyzed and the antimicrobial resistance of the isolated Salmonella spp. was investigated. A total of 3,001 serum samples for ELISA were collected from 17 farms during two consecutive years (2012-2013). The mean values of ELISA OD% for each 8 age groups were as follows; gilt 27.83 (n=472), sow 23.75 (n=367), 150 days (d) of pig 16.53 (n=278), 130 d 11.87 (n=366), 100 d 9.46 (n=378), 20 d 9.17 (n=394), 70 d 6.56 (n=382), 40 d 3.72 (n=364). From July 2013 to January 2014, a total of 53 (8.0%) Salmonella strains were isolated from 665 slaughtered pigs shipped from those 17 farms. The mean values of ELISA OD% for each age groups serum samples that were collected in the second half of 2013 showed a positive correlation at 100 d (0.61, P<0.05), 130 d (0.45, P<0.1) with the isolation rate of Salmonella spp. in the slaughtered pigs. All the isolates were identified by a real-time PCR and tested for antimicrobial susceptibility. As a result, the predominant serovar was S. Typhimurium (52.8%) and there were 15 strains showing their own antimicrobial resistance pattern. All strains were susceptible to amoxicillin, cefepime, ciprofloxacin and some of them were resistant to streptomycin and tetracycline (60%), ampicillin (53.3%), chloramphenicol (33.3%), respectively.
김광섭(Kwang-Seob Kim),방상석(Sang-Suk Bang),권병기(Byung-Ki Kwon),문상호(Sang-Ho Moon),양병훈(Byung-Hun Yang),이명준(Myung-Jun Lee),최창호(Chang-Ho Choi) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
We introduce 2[MVA] 3300[V] 7-level voltage source inverter system developed by POSCON and describe the main characteristics of inverter system, i.e. PWM converter, H-bridge power module, phase shifted carrier PWM. The P주 converter is a three-phase boost converter, which operates in a 4-quadrant and in a nearly unit displacement power factor. Experimental waveforms are also presented to verify the proposed method and performance of the developed system.