Protection of layers against Newcastle disease in Santiago de Cuba (Original)
Keywords:
poultry; newcastle; layers; protectionAbstract
Newcastle disease is considered highly contagious, affects the production of eggs and meat, of viral etiology, with great losses in poultry farming in the world. In many countries, it is controlled, but occasionally outbreaks occur that cause high mortality and low yields in surviving birds. In order to evaluate the protection of layers against this pathology in Santiago de Cuba, they were analyzed in the poultry diagnostic and research laboratory of said province. The samples corresponding to the last four-month period of 2019, 640 samples of White Leghorn L33 birds, with an average age of 304 days, belonging to eight units. The decline curve of antibodies in this period and those that present at the end of the rearing were evaluated. The geometric mean and the percentage of positive reactors were determined. The diagnostic kits used were prepared by the Biological and Pharmaceutical Laboratories (LABIOFAM), the antigen with a Hemagglutination Inhibition (HI) titer of 1: 256, the positive and negative control sera, this with a HI titer of 1: 64. The antigen after carrying out the test is adjusted to four hemagglutinating units (HAU and that titer was checked. For the statistical processing of the results, the descriptive method of diagnoses was used from the results obtained in the analysis of the samples. obtained show that in the purpose under study the animals maintain correct protection throughout their productive life against Newcastle disease.
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