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- W908280069 abstract "The studies were conducted on the 3 flocks of Cobb line reproductive hens. Serological monitoring of each flock was conducted with ELISA tests. Assessments were conducted for the presence of antibodies of reoviral infections (REO), mycoplasmes - M. gallisepticum and M.synoviae (MG and MS), viruses of infectious bursitis disease (IBD), infectious bronchitis viruses (IBV), Newcastle disease viruses (NDV) and infectious chicken anemia(CAV). The assessed birds were vaccinated against REO, IBD, IBV, NDV, CAV and SHS. However, no immunisation for MG/MS was performed. The hens monitored for REO showed natural immunity throughout the examination period, except the birds from Cobb2 and 3 flocks which demonstrated low mean geometric titres - 2573 and 960, with high % CV (75.6 and 96.1) in 10th and 12th week of life. No antibodies of MG/MS were detected over the examination period in any of the flocks, or they appeared only at a small percentage (5%, 4.3%). The serologic examinations for IBD and CAV confirmed the satisfactory immunity of all the birds during the investigations. The monitoring for IBV revealed an average protection level against this disease for all the chicks. In the birds aged 18-20 weeks from Cobb1 flock, 43.5% seropositive reactions were indicated, as well as low antibody levels, whereas in the 25th-26th weeks this flock acquired normal immunity. All the birds examined for NDV at the age of 1-3 days showed low immunity. As early as in the 18-20th weeks 100% of the birds in Cobb1 and 3 flocks were seropositive, yet in the wide range of minimum and maximum titres, in the 25-26th weeks immunity improvement was recorded." @default.
- W908280069 created "2016-06-24" @default.
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- W908280069 date "2003-01-01" @default.
- W908280069 modified "2023-09-23" @default.
- W908280069 title "Status immunologiczny kur reprodukcyjnych w fermie drobiu" @default.
- W908280069 hasPublicationYear "2003" @default.
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