The variances in the blood picture of bovines in gestation were studied in 75 black and white Dutch breed heifers. At the end of the gestation period there was observed a significant increase of the MCV responsible for the increase of the PCV. Because the hemoglobin values were unaltered a significant decrease of MCHC was noticed at the end of gestation period. The leucocytes and differential counting showed no variations during gestation period and recent puerperium. The results obtained for the group of empty heifers, animals in their initial gestation phase, between 4 and 6 months of gestation, heifers at the end of their gestation and for cows during their puerperium period were respectively as follow: Erythrocytes (millin/cu mm) - 6,01; 5,89; 5,95; 5,95 e 6,39 Hemoglobin (gm/100cc) - 9,63; 10,22; 10,24; 9,85 e 9,58 PCV (%) - 27,52; 28,79; 29,05; 31,62 e 28,93 MCV (cuµ) - 46,43; 49,41; 49,17; 53,57 e 44,63 MHC (ϒ/gm) — 16,27; 17,47; 17,28; 16,82 e 15,18 MCHC (%) - 34,63; 35,15; 35,20; 31,13 e 33,03 Leucocytes (thousand/cu mm) - 16,17; 18,45; 16,14; 18,03 e 15,15 (%) - 21,7; 24,3; 19,1; 18,0 e 24,8 neutrophil (cu mm) _ 3528,7; 4505,7; 3026,1; 3198,5 e 3616,6 (%) - 3,9; 3,9; 4,9; 4,9 e 4,1 eosinophil (cu mm) _ 625,7;734,5; 803,9; 925,3 e 605,3 (%) - 0; 0,1; 0,2; 0,1 e 0,1 basophil (cu mm)_ 0; 15,3; 33 6; 22,1 e 19,7 (%) - 72,4; 67,9; 74,5; 74,9 e 69,1 lymphocyte (cu mm)_ 11673 6; 12894,3; 12067,8; 13524,6 e 10650,2 (%) - 2,1; 1,3; 1,3; 2,0 e 1,8 monocyte (cu mm) _ 351,0; 281 9; 209,0; 355 3 e 261,5 ; As variações do quadro hemático de bovinos em gestação foram estudadas em 75 novilhas da raça holandesa branca e preta. No final da gestação observou-se um aumento estatisticamente significante do volume médio de hemácias (VCM), responsável direto pelo maior valor do hematócrito, no mesmo período. De maneira contrária, por permanecerem inalteradas as taxas de hemoglobina, observou-se uma diminuição estatisticamente significante da concentração de hemoglobina corpuscular média (CHCM) no final da gestação. A ...