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| Author(s): |
Alexandre Coutinho Antonelli
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2007-08-10 |
| Examining board members: |
Enrico Lippi Ortolani;
Sergio Novita Esteves;
Sandra Satiko Kitamura;
Maria Claudia Araripe Sucupira Magalhães;
Cássio Xavier de Mendonça Júnior
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| Advisor: | Enrico Lippi Ortolani |
| Abstract | |
The aim of this project is to evaluate the capacity of a molybdenum-rich mineral salt in the prevention of cumulative cooper poisoning (CCP) in sheep, through clinical and blood exams and hepatic copper and molybdenum concentrations. Twenty five Ile-de-France sheep were randomly distributed into five groups of five animals each, where group 1 received a 80% forrage and 20% concentrate diet, groups 2 and 3 received a 50% forrage and 50% concentrate diet, and groups 4 and 5 received the same diet as groups 2 and 3 with a daily supplementation of 150mg of copper sulphate until the end of the experiment (150 d). Groups 1, 3 and 5 received a mineral salt with 300 ppm of molybdenum. For three times during the experiment (day zero, 45th and 105th day) a liver biopsy was carried out to evaluate the degree of copper accumulation in this organ. Clinical examination was followed every two weeks, as far as blood and urine samples were withdrawn. Three sheep from group 4 and one sheep from group 5 presented clinical picture of CCP. There was no difference in the frequency of mortality between groups 4 and 5 (P = 0.56). The liver copper concentration was higher in sheep with CCP (2450 ppm) compared to sheep that not presented CCP (1518 ppm). The higher the ingestion of molybdenum in the diet the lower the liver copper concentration at the end of the experiment (r = -0.72). Sheep with CCP had higher liver zinc concentration. The presence of high activity of GGT (> 56.5 U/L) and AST (>120 U/L) indicated effectively the high accumulation of copper in liver (> 1000 ppm). (AU) | |