Levantamento epidemiológico da linfadenite caseosa em rebanhos de ovinos e caprinos no Vale do Jequitinhonha e Norte de Minas Gerais

Abstract

The aim of this study was to perform an epidemiological survey of Caseous Lymphadenitis in mixed herds of sheep and goats and sheep herd in the northern and Jequitinhonha Valley mesoregions in the state of Minas Gerais. The sampling was conducted at two levels, property and animals. They were analyzed 38 randomly farms, 28 in the North mesoregion, 14 mixed herds and 14 sheep herds, and 10 farms in Jequitinhonha Valley with sheep herds. In each farm was applied a questionnaire, and 10% of adult herd, with the minimum of eight animals was submitted to clinical examination and blood sampling for serological testing. The frequency distribution of seropositive was compared with individual variables by means of chi-square with 0,05 significance level. The number of seropositive animals was greater than the number of animals clinically positive. All animals that were positive on clinicalexamination were confirmed by serological examination. All the properties had at least one clinically positive animals. There was no statistical difference between the mesoregions for both tests. The herds with sheep showed lower positivity (44,8%) compared to mixed herds (56,2%) in serum test and did not differ in clinical testing. In analyzing the species of small independent ruminants of the herd, the frequency was 70.7% in goats, while for sheep was 44,3%. All properties sampled did not perform to enter a quarantine animal, performed movement of animals between properties near and did not vaccinate the animals against lymphadenitis. As regards the cleaning the premises, no property had excellent cleaning and properties which sanitizing were classified as poor had the highest incidence of the disease. The incidence of Caseous Lymphadenitis in the properties that acquired animals from other states was higher than those who just bought of Minas Gerais. In the properties that relied on a professional monitoring had lower incidence of lymphadenitis, furthermore it was also verified the influence of the correct management of the disease. At this it is possible to infer that the serological test is the most effective way to check the disease and occurred mostly in goats than sheep. The hygienic-sanitary management as well as the control of Caseous Lymphadenitis can help reduce in the occurrence of this disease, which is widespread in the mesoregions studied.