Dissertation/ Thesis
Aflatoxicose em bovinos ; Aflatoxicosis in cattle
| العنوان: | Aflatoxicose em bovinos ; Aflatoxicosis in cattle |
|---|---|
| المؤلفون: | Pierezan, Felipe |
| المساهمون: | Barros, Claudio Severo Lombardo de, http://lattes.cnpq.br/4788564533191301, Schild, Ana Lucia Pereira, http://lattes.cnpq.br/1712864316987104, Driemeier, David, http://lattes.cnpq.br/6841118121493906, Fighera, Rafael Almeida, http://lattes.cnpq.br/6223365736139655 |
| بيانات النشر: | Universidade Federal de Santa Maria BR Medicina Veterinária UFSM Programa de Pós-Graduação em Medicina Veterinária |
| سنة النشر: | 2013 |
| المجموعة: | Manancial - Repositório Digital da UFSM (Universidade Federal de Santa Maria) |
| مصطلحات موضوعية: | Doenças de bovinos, Micotoxicose, Aflatoxicose, Doenças hepáticas, Patologia, Diseases of cattle, Mycotoxicosis, Aflatoxicosis, Hepatic diseases, Pathology, CNPQ::CIENCIAS AGRARIAS::MEDICINA VETERINARIA |
| الوصف: | In the first part of the thesis, the spontaneous occurrence of an outbreak of chronic aflatoxicosis is reported in dairy calves. Forty 4-month-old male Holstein calves of approximately 100kg were fed a ration constituted by alfalfa hay, broken corn and milk substitute. Six calves (15%) died after presenting a disease characterized by general unthriftiness, diarrhea, rough hair coats, abdominal pain, prolapsed rectum and grinding of teeth. The clinical course, was 2-3 days; however many calves in this lot that did not die, remained underdeveloped. Three calves were necropsied. Necropsy findings included firm, light tan livers and marked hydrothorax, ascites and edema of the mesentery, mesocolon and of the mucosal folds of the abomasum. Main histopathological changes were restricted to the liver and consisted of fibrosis, moderate megalocytosis, biliary duct hyperplasia and venoocclusive disease. The analysis by thin layer chromatography of the corn fed to calves revealed 5,136 ppb of aflatoxin B1. A diagnosis of aflatoxicosis was made based on the characteristic clinical signs and pathology, on the absence of Senecio spp. in the food and on the presence of high levels of aflatoxin in the corn fed to the calves. In the second part of the thesis, two experiments were performed in order to determine the toxic effects of varying doses of aflatoxins in calves. Clinical, productive and pathologic aspects of affected calves were considered. In the first experiment, nine 2-4- month old calves Holstein Friesian calves were fed, for two months, daily amounts corresponding to 1.5% of their body weight of a ration containing 500±100 ppb of aflatoxins. Three calves were used as controls. In the second experiment, three 4-5-month old Holstein Friesian calves, were orally fed daily small parcels of a concentrate of aflatoxins diluted in 500 ml of water corresponding to 1,250, 2,500 e 5,000 ppb of B1 aflatoxin (AFB1). A male calf was used as control. During all the experimental period of the first experiment, the weight gain of ... |
| نوع الوثيقة: | thesis |
| وصف الملف: | application/pdf |
| اللغة: | Portuguese |
| Relation: | PIEREZAN, Felipe. Aflatoxicosis in cattle. 2013. 61 f. Tese (Doutorado em Medicina Veterinária) - Universidade Federal de Santa Maria, Santa Maria, 2013.; http://repositorio.ufsm.br/handle/1/4077 |
| الاتاحة: | http://repositorio.ufsm.br/handle/1/4077 |
| Rights: | Acesso Aberto |
| رقم الانضمام: | edsbas.A35F5915 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |