Imunidade celular em vacas Holandesas soropositivas para o Vírus da Leucose Bovina (BLV) durante o período de transição

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Abstract

This research evaluated the dynamics of leukocytes and lymphocytes subsets in seropositive Holstein cows for BLV during the transition period. Blood samples (n=72) from 12 cows were harvested from week -2 up to week +3 to perform leukogram, immunophenotyping, cortisol and haptoglobin (Hp). Leukocytes pattern was characterized by leukocytosis, neutrophilia, monocytosis and eosinopenia around calving. Lymphocytosis and high proportions of B cells CD21+ were a constant finding between week -2 and +3, thus cows were tested and confirmed seropositive for BLV. The values of T lymphocytes subsets were low during the transition period, observing two peaks that coincided with high levels of cortisol at delivery (2.11μg/dL) and week +3 (1.97μg/dL). Hp had gradual increase from week -2 (166μg/mL) until week +3 (576g/mL) probably due to high rate of uterine infection detected between week +2 and +3. The seropositive cows for BLV presented stress leukogram around delivery, except for lymphocytes. Lymphocytosis and the high proportions of B cells, associated with the low proportions of T lymphocytes, can be indicative of immunosuppression and predisposition to the inflammatory process observed in the post-partum period.

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APA

Gomes, V., Baldacim, V. A. P., Costa, J. F. R., Costa e Silva, C. P., Arcaro, J. R. P., Miranda, M. S., … Madureira, K. M. (2017). Imunidade celular em vacas Holandesas soropositivas para o Vírus da Leucose Bovina (BLV) durante o período de transição. Arquivo Brasileiro de Medicina Veterinaria e Zootecnia, 69(6), 1367–1375. https://doi.org/10.1590/1678-4162-8982

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