Aspectos Epidemiológicos e Clinicopatológicos da Seneciose Crônica em Bovinos na Mesorregião Sudoeste Rio-grandense

Abstract

This work aimed to describe the epidemiological and clinicopathological findings of the seneciosis in the Southwest Mesoregion of Rio Grande do Sul, state of Brazil, emphazing the importance of disease to livestock in the region and the importance of the liver biopsy for definitive diagnosis Assessments were made through questionnaires in 16 rural properties in the region who had suspected cases of poisoning from August 2011 to March 2014. These assessments revealed that the disease is an important cause of mortality in adult cattle in the region and possibly the one that most causes economic losses to the raising cattle. From a total of 88 cattle that lower in the body development, from nine distinct properties, 69 animals (about 80%) were positive for chronic seneciosis after showing characteristic signs of the intoxication, as periportal fibrosis in 83% of cases, megalocytosis in 81% of cases and bile duct proliferation in 73% of cases, and these changes were classified as mild these changes were classified from mild to accentuated. Twenty-one positive cases of chronic seneciosis were also studied. These, four cows showed ovarian changes characterized microscopically by with marked megalocytosis and nuclear pseudo-inclusions in large luteal cells (LLC). This study confirmed the existence of cattle poisoned in herds, and others with potential to develop the most serious form of the disease. The results of these assessments were fundamental to guide owners and technicians about the main characteristics of the disease and forms of control to be adopted. The study showed that chronic seneciosis is the major cause of death in adult cattle in the region, as well as establish the real situation of the disease in herds, and describe the first time the gonadal lesions in cows with chronic seneciosis.