The packet cell volume was evaluated by the authors in 321 healthy female Holstein cattle raised at Campinas dairy region. São Paulo State. All the animais used in this assay were healthy and free of Leucosis, Tuberculosis, Brucellosis and blood parasites. The packed cell volume has been studied by method of hematocrit with capilary tubos. The results showed an influence of age on packed cell volume with average reference values of 30.12 ± 2.72%.
blood; hematology; cattle
