Variações nos parâmetros hematológicos de vacas da raça Bonsmara lactantes de primeira a terceira lactação e não lactantes, no estado de Minas Gerais

Abstract

The aim of this study was to evaluate the hematological parameters of Bonsmara cows in different numbers of lactations and non-lactating cows. 119 cows were used, distributed in four groups according to the number of lactations. Hematological assessments were performed using automated equipment. The erythrogram evaluated: red blood cells (He), hemoglobin (Hgb), globular volume (VG), mean corpuscular volume (CMV), mean corpuscular hemoglobin concentration (CHCM), Red cell distribution range (ADH), platelet count, volume platelet count (MPV). In the leukogram, the leukocyte count was performed in blood extensions stained by the May-Grüwald-Giemsa method, 100 cells were identified and counted and the relative leukocyte formula was established, through which the absolute leukocyte values were calculated. Descriptive statistical analysis of the data was carried out, with a 5% significance level. Significant differences were found in non-lactating animals in He, Hgb and VG in relation to those of 3rd and 1st lactation. Significant differences in CHCM between animals from 1st and 2nd lactation. PLT between 1st lactation and non-lactating animals. The leukocytes and lymphocytes of the 3rd lactation cows showed a significantly lower value than the 1st and 2nd lactation cows and the number of rods in the non-lactating cows. The number of lymphocytes decreased gradually from the 1st to the 2nd and 3rd lactation cows. This study concludes that there are variations in the values of the erythrogram, platelet and leukogram in lactating Bonsmara, 1st and 3rd lactation and non-lactating