Economical losses and effects of the strategies against edema disease were investigated in one pig farm. Due to the edema Disease, 639 growing-finishing pigs died and economical losses of thesedeaths were/10, 449, 130. Among these losses, direct loss due to the piglet deaths was/4, 013, 063 and cost for the strategies were/6, 436, 067. Preventive strategies considering the characteristics of edema disease were performed and the total cost for completing this outbreak was/1, 387, 867 and improvement benefit was estimated as/4, 697, 586. The feeding cost was saved by/344, 834 and thedelivery rates, average open days and the return of estrus rates after meeting were improved.

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During 1998 and 2000, the prevalence, serotypes, susceptibility to antimicrobial drugs and plasmid-profle of Salmonella were examined using 973 layer-environment samples obtained from 7 poultry farms. The prevalence of Salmonella at each of the farms were between 3.1 and 24.1 % and overall prevalence was 12.3 %. Salmonellal isolation rates from the environment increased drastically during the study period. Salmonellal isolation rates were 35.1 % in the accumulated dust, 23.1 % in rats, 5 % in sanitary insects such as flies and cockroaches, 5 % in feed and water and 3.8 % in cloacal swabs. Salmonella was not isolated from introduced chicks, eggshells and replaced chicken. Isolates were classified into 18 serotypes, such as Bareilly, Weltevreden, Enteritidis, etc. The serotypes of Salmonella obtained from cloacal swab samples were also obtained from the same flock environment. Of the 71 isolates, 64 (90 %) were susceptible to all 11 antimicrobial drugs tested and the remaining 7 strains were uni-resistant to the drugs such as tetracycline, ampicillin, kanamycin or streptomycin respectively and no particular common drugs resistant patterns among farms were identified. Among 115 Salmonella isolates, there were 59 isolates (51 %) that harbored plasmids. By plasmid-profile examination, S. Wertevreden isolates were classified into 6 groups and 2 types were common between cloacal and flock environment samples.

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