Abstract

COLAS CHAVEZ, M et al. EPIDEMIOLOGICAL EVALUATION OF THE BREATHING PROCESS OF BACTERIAL LAYING HENS. Rev Salud Anim. [online]. 2011, vol.33, n.2, pp.69-75. ISSN 0253-570X.

With the objective of evaluating the epidemic situation of the breathing processes in egg-laying hens, a retrospective epidemiological study was carried out during the period between January, of 2004 to December, 2008, in two commercial enterprises. From the reception of the information seated in the official registrations of the provincial Veterinary Medicine Institute, the relative mortality per group diseases, the prevalence of focal period and the positive focal incidence were calculated by WinEpi TASAS version 2.0 program. In order to know the temporary behavior of the health events referred, a analysis of chronological series was carried out in STATGRAPHICS PLUS 5.1, determining tendency, seasonal variation and ciclicidad. Kruskal Wallis and U the Mann-Whitney (Minitab 14 statistical package) test were applied in order to compare the relative mortality between months and season of the year. It was demonstrated that the health events more prevalent during the period analyzed were breathing and digestive diseases and they constitute the main causes of deaths in the category analyzed. A similar dynamic of the positive focal incidence in both breathing events; could be verified however, several behaviors were appreciated regarding levels of infection reached during the period. A marked seasonal and recurrent variation was observed in the rainy season in both breathing processes in egg-laying hens in the years analyzed.

Keywords : chonologycal series; epidemiology; infectious Coryza; chronic respiratory syndrome (SRC).

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