PREVENTION OF POULTRY INFECTIOUS ENCEPHALOMYELITIS
Significant economic losses to poultry farms are caused by infectious, especially viral diseases, including infectious avian encephalomyelitis (IAE). A possible threat to the profitability of the poultry industry in Ukraine at present is the epizootic disadvantage of poultry infectious encephalomyelitis. Economic losses from IAE include losses from increased poultry death, reduced productivity, hatchability of chickens, additional costs for disease prevention and elimination. Quick and effective diagnosis of the disease, in this case, makes it possible to predict the development of the epizootic process, assess possible economic losses, timely and correctly develop a plan of treatment and prevention measures. Permanent immunity is formed after the disease (again, the poultry is usually not sick), as well as during vaccination. The only effective method of IAE prevention is preventive vaccination of parent flocks and laying hens with live vaccine before laying eggs (in immune herds of laying hens, the virus is not transmitted vertically). In Ukraine, live - mono and combined vaccines have been registered for the specific prevention of IAE, including: mono- vaccines - 5 (45.4 %) and combined - 6 (54.6 %).
During selective serological monitoring of blood sera of poultry eggs from some poultry farms of Ukraine for the presence of antibodies to the IAE virus of poultry, different levels of average titers were found. In total, the blood sera of laying hens from 34 batches from 15 poultry farms were tested for the presence of medium antibodies to the IAE virus. Medium antibody titers in poultry that were vaccinated with live IEM vaccines once at the age of 62-70 days ranged from 999 to 12785. Below the baseline, medium titers were found in 2 batches, namely among birds aged 13 and 22 weeks.
When determining the effectiveness of the vaccine VIR 110, Biovak (Israel), which was used on 29 batches of laying hens, it was found that the average titers to IAE virus ranged from 222 to 10520. Moreover, the average titers of antibodies to IAE were below baseline (from 5000 - 12,000) among birds of 3 batches at 13, 15, and 45 weeks of age, which is 10.3 %. The effectiveness of the vaccine VIR 110 (Biovac) against IAE was 89,7 %. Continuous serological monitoring is necessary to monitor the effectiveness of IAE vaccinations and the epizootic welfare of poultry.
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