Pathology of Komarov vaccine in Hitchner B1 vaccinated and unvaccinated broilers
| Autor: | John Osita Arinze Okoye, Ifeanyi Onyema, Jacinta Ngozi Omeke, Rita Chidimma Maxwell-Mkpado, Harriet Nkechi Ikenna-Ezeh, D. C. Eze, Nnenna T. Emejuo |
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| Rok vydání: | 2021 |
| Předmět: |
Pathology
medicine.medical_specialty animal structures Newcastle Disease Newcastle disease virus Spleen Leg paralysis Antibodies Viral Newcastle disease Haemagglutination inhibition Food Animals medicine Animals Poultry Diseases biology business.industry Vaccination Broiler Viral Vaccines Hemagglutination Inhibition Tests biology.organism_classification medicine.anatomical_structure biology.protein Animal Science and Zoology Antibody business Chickens |
| Zdroj: | Tropical animal health and production. 53(6) |
| ISSN: | 1573-7438 |
| Popis: | Newcastle disease (ND) is a major problem of poultry production worldwide. Control is by biosecurity and vaccination. In this project, we studied the pathology of Komarov vaccine which is commonly used in many countries of Africa on the Hitchner B1 (HBI) vaccinated and unvaccinated broilers. Seventy-five Arbor Acres broilers were obtained at 1 day old. Twenty-five of the broilers were given HB1 vaccine at the hatchery and Komarov vaccine at 5 weeks of age (group HK). A second group of 25 broilers were given only Komarov vaccine at 5 weeks of age (group K). The third group remained as unvaccinated (UU). All the groups were observed for clinical signs and lesions. Depression, sneezing, coughing and noisy respiration were observed in group K broilers from day 2 post Komarov vaccination (PKV). Leg paralysis occurred in 6 broilers on day 8 PKV. The clinical signs were milder in the HK broilers. Only one broiler showed leg paralysis in this group on day 18 PKV. No mortality occurred in the three groups. The bursa, spleen and thymus showed mild to moderate enlargement, atrophy and depletion of lymphocytes on days 3, 5, 8 and 14 PKV in HK and K groups. The trachea and lungs were congested. The haemagglutination inhibition (HI) antibody titres in the K group were higher than those of HK and UU groups on days 7, 24 and 21 PKV. The above observations show that Komarov vaccine may cause no mortality in vaccinated and unvaccinated broilers and higher HI antibodies are produced in broilers that have not been vaccinated earlier. |
| Databáze: | OpenAIRE |
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