Variação dos constituintes do eritrograma em vacas holandesas no pós-parto / Erythrogram profile during postpartum period in holstein cows

RESUMO

Com intuito de avaliar a variação dos constituintes do eritrograma em fêmeas bovinas da raça Holandesa no pós-parto, foram colhidas 142 amostras de sangue nos primeiros 90 dias pós-parto. As amostras foram colhidas de vacas clinicamente sadias e não reagentes ao antígeno (GP 51) do vírus da Leucose dos Bovinos, divididas em nove grupos experimentais, de acordo com o momento da colheita. As amostras de sangue foram colhidas em frascos contendo EDTA e realizaram-se as provas contagem do número de hemácias, determinação do volume globular, dosagem de hemoglobina e o cálculo dos índices hematimétricos (VCM, HCM, CHCM). O eritrograma variou no período pós-parto e estas alterações foram observadas nas primeiras 24h pós-parto. A hemoconcentração observada no parto desapareceu nas primeiras 24 horas de puerpério. Os valores oscilaram entre hemácias, 5,08 ± 0,60 e 6,11 ± 0,72 hemácias /µL; taxa de hemoglobina, 9,85 ± 1,16 e 11,46 ± 1,40 g/dL; volume globular, 27,9 ± 3,3 e 31,9 ± 3,6 %; VCM, 50,10 ± 5,90 e 55,27 ± 6,88 fL; HCM, 18,19 ± 1,63 e 19,50 ± 2,76 pg; CHCM, 34,83 ± 2,07 e 36,88 ± 1,67 %. Os constituintes do eritrograma permaneceram dentro dos limites de referência das raças de bovinos criadas no Estado de São Paulo.

ABSTRACT

With the intention to evaluate the erythrogram profile during postpartum period in Holstein cows, 142 blood samples were collected from cows during the first 90 days after parturition. Blood samples were collected from clinically healthy cows that were non-reactive to the antigen of bovine leukosis virus (GP 51). These animals were divided into nine experimental groups based on the time of the postpartum sample collection. The blood samples were collected with EDTA and submitted to the following tests erythrocyte counts, packed cell volume, hemoglobin concentration and calculated blood indices (MCV, MCH, MCHC). There was influence of the postpartum period on the erythrogram. These alterations were observed during the first 24 h after parturition. The hemoconcentration observed during the parturition disappeared during the first 24h of postpartum. Variation of the values were observed red blood, 5.08 ± 0.60 and 6.11 ± 0.72 cells /µL; hemoglobin concentration, 9.85 ± 1.6 and 11.46 ± 1,40 g/dL; packed cell volume, 27.9 ± 3.3 and 31.9 ± 3.6 %; MVC, 50.10 ± 5.90 and 55.27 ± 6.88 fL; MHC, 18.19 ± 1.63 and 19.50 ± 2.76 pg; MCHC, 34.83 ± 2.07 and 36.88 ± 1.67 %. The values of the hematological components obtained in this study did not exceed the limits of the reference values, obtained from cows raised within the state of São Paulo.