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The research evaluated the hematological alterations in sheep infected experimentally with T. vivax strain precedent of Paraiba State. Eight male sheep were used, four in the testimony group and four infected with 105 T. vivax. Blood samples were collected two times before infection and posterior to receiving on days designated. The evaluated parameters were: red blood cell count, total leucocytes, hemoglobin, hematocritic, mean corpuscular volume, mean corpuscular hemoglobin concentration, transferrin and iron. The animals were examined daily by pasitemia. The statistical analysis was carried through using the Wilcoxon test of 5% of probability. The results were: parasites were detected in the blood on the first day after the infection of the intermittent parasite until the end of the experiment, there was a significant decrease in the red blood cell count, hemoglobin and in the hematocritic and in the average mean corpuscular volume, the anaemia, at the end of the observations, were microcitic, normochromic. The transferrin that were high and iron decreased at the end of the experimental period and observed leucocytosis due to the lymphocytes. The T. vivax strain precedent of Paraiba State occasioned relevant hematological alterations in sheep characterized for anaemia and elevation of leukocytes.KEY WORKS: Haematologia, sheep, Trypanosoma. A presente pesquisa avaliou as alterações hematológicas em ovinos infectados experimentalmente com uma amostra de T. vivax procedente do Estado da Paraíba. Utilizaram-se oito ovinos machos, sendo quatro destes para o grupo testemunho e quatro infectados com 105 tripomastigotas de T. vivax. Colheram-se amostras de sangue em dois tempos antes da infecção e posteriormente em dias determinados. Os parâmetros avaliados foram: contagem global de hemácias e de leucócitos, hemoglobina, hematócrito, volume corpuscular médio, concentração de hemoglobina corpuscular média, transferrina e ferro. Os animais foram examinados, diariamente, por parasitemia. Para a análise estatística, empregou-se o teste de Wilcoxon a 5% de probabilidade. Detectaram-se parasitos no sangue no 1º dia após infecção (DAI) e com parasitemia intermitente até o final do experimento, havendo um decréscimo significativo (pPALAVRAS-CHAVES: Hematologia, ovino, Trypanosoma. |
