Structures and possibilities of herd management on the example of respiratory enzootic infection of calves     

Hofmann W  Heckert HP 《Berliner und Münchener tier?rztliche Wochenschrift》1999,112(12):430-434

With the keeping of cattle in bigger herds problems arise, which require a modified veterinary approach. In stead of and in addition to the treatment of individual animals improvement of hygiene, intensification of prophylaxis, fast recognition (herd diagnostics) and interregional comparability have to be established. Beside the conventional field veterinarian, who is consulted on request primarily for the treatment of single animals, specialists in team practices as an alternative, permanently employed veterinarians or firm contracts with a health service up to integrated herd control are thinkable. The clarification and control of infectious diseases of the respiratory tract in cattle operations require an exact analysis of the environmental conditions and the identification of etiologic agents. Special attention has to be drawn to the evaluation of the barn climate and the respective taking of samples concerning the actual disease situation.  相似文献   

Classical swine fever in wild boars in Switzerland     

Hofmann MA  Thür B  Vanzetti T  Schleiss W  Schmidt J  Griot C 《Schweizer Archiv für Tierheilkunde》1999,141(4):185-190

In May 1998, wild boars with classical swine fever (CSF) symptoms were detected in the southern part (Canton Ticino) of Switzerland. CSF virus was isolated from the submitted samples and RT-PCR followed by direct nucleotide sequencing of the 5' non-translated region showed that this virus was identical to the isolate previously recognized in wild boars from the area of Varese (Italy). In most animals, antibodies to CSF virus were detected as well. An immediate measurement was taken by limiting the movement of pigs and identifying both risk and surveillance zones. In order not to disturb potentially infected wild boars within their habitat a complete hunting prohibition for 2 months was enforced. The different possibilities of the control of CSF outbreaks in wild boars are discussed.  相似文献   

A survey of Newcastle disease in Swiss laying-hen flocks using serological testing and simulation modelling   总被引：1，自引：0，他引：1  

Gohm DS  Thür B  Audigé L  Hofmann MA 《Preventive veterinary medicine》1999,38(4):459-288

Newcastle disease (ND) is a highly contagious viral disease of birds particularly domestic poultry. Switzerland is currently declared free from ND; since vaccination is prohibited, the detection of antibodies against ND virus (NDV) results in the destruction of the respective flock (stamping-out policy). However, in 1995 and 1996, antibody-positive flocks were detected and sporadic ND outbreaks even occurred in Switzerland. Therefore, a serosurvey was done to look for evidence of NDV infections in Swiss laying-hen flocks. The survey was designed to provide 95% confidence of detecting at least one seropositive flock if the flock prevalence were 1%. Thirty blood samples from each of 260 commercial laying-hen flocks were collected during 1996 in a central poultry slaughterhouse. Sera were screened for NDV antibodies with a commercial blocking enzyme-linked immunosorbent assay (ELISA). Samples with a questionable or positive test result were retested with the same ELISA. A stochastic computer model was applied to define a cut-off number of test-positive samples to help to differentiate between true- and false-positive flocks and to estimate the true flock prevalence of infection. Four flocks were identified as NDV-seropositive and the NDV true seroprevalence among commercial laying-hen flocks in Switzerland was most likely between 1.35 and 1.55%. This indicates that Swiss laying-hen and parental flocks with more than 150 animals have been in contact with strains of NDV that cause subclinical infection in chicken, because no clinical symptoms have been observed. In this context, computer simulation was a useful technique to interpret survey results.  相似文献   

Gannenlaus und Gannensterben     

Dr. Christoph Hofmann 《European Journal of Forest Research》1937,59(15):469-487

  相似文献   

Enzyme-linked immunosorbent assay for the detection of porcine epidemic diarrhea coronavirus antibodies in swine sera   总被引：1，自引：0，他引：1  

M Hofmann  R Wyler 《Veterinary microbiology》1990,21(3):263-273

An enzyme-linked immunosorbent assay (ELISA) for detecting serum antibodies to the porcine epidemic diarrhea coronavirus (PEDV) was established by using cell culture-grown PEDV as antigen for coating. Ultracentrifugation through 20 and 45% (w/w) sucrose cushions proved to be the best antigen purification method. Examination of 1024 swine sera showed a high specificity and a greater sensitivity of the ELISA, when compared with indirect immunofluorescence. Reference sera with high antibody titers to PEDV originated from two pigs experimentally infected with PEDV. Three different antigen purification methods and the advantages of the ELISA compared with an immunofluorescence test are discussed.  相似文献   

Eine Waldstation für Tannenlausstudien     

Dr. Ch. Hofmann 《Journal of pest science》1935,11(11):129-130

Ohne Zusammenfassung  相似文献   

    

Christoph Hofmann 《Forstwissenschaftliches Centralblatt》1939,61(5):137-142

Ohne Zusammenfassung  相似文献   

Nonnenfalterkontrolle auf biologischer Grundlage     

Chr Hofmann 《Forstwissenschaftliches Centralblatt》1937,59(17):549-551

Ohne Zusammenfassung  相似文献   

Beschädigungen in einer Wohnung durch Wespen     

Dr. F. P. Müller  Schädlingsbekämpfermeister Curt Hofmann 《Journal of pest science》1955,28(5):74-75

Ohne Zusammenfassung  相似文献   

Wasserhaushalt,Stoffeintrag, Stoffaustrag und biologische Studien im Naturpark Schönbuch bei Tübingen     

U. Ammer  G. Einsele  W. Arnold  O. Klee  R. Agerer  G. Agster  U. Babel  J. Behringer  W. Böcking  F. -H. Evers  W. Fleck  H. Günzl  K. -F. Hofmann  H. Janz  J. Körner  I. Kottke  V. Kracht  A. Krebs  K. Kunzweiler  W. -D. Langbein  H. -U. Moosmauer  S. Müller  E. Nickel  S. Pfeiffer  R. Rausch  H. Schmidt-Witte  O. Schwarz  R. Stegmayer 《European Journal of Forest Research》1983,102(1):282-324

Ohne Zusammenfassung (Prof. Agerer seit 1982 am Institut für Systematische Botanik, München). (Weilimdorf) (zuvor t?tig bei der FVA Stuttgart, siehe oben) (Hohenheim)  相似文献