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The aim of this study was to investigate whether prepartal leukogram in cows   with retained placenta could indicate the presence of subclinical systemic   inflammatory response before the onset of disease. After calving, sixteen   highly pregnant Holstein cows, aged 3 to 9 years, without clinical signs of   the disease prior to calving were divided into two groups: the first group   (n=9) were animals without retained placenta, or any visible inflammation   after birth; the second group (n=7) were cows with retained placenta. Blood   was sampled three times before parturition, at intervals of one week, and   once 24 hours after birth. The number of total leukocytes, segmented and non   segmented neutrophilic granulocytes (NG), lymphocytes and monocytes were   determined by standard laboratory techniques. The results have shown that in   the group of cows with retained placenta the number of mature neutrophils was   slightly elevated in the third, second and last week before calving, and   equal number of non segmented neutrophils in regard to the group with no   retention. The results have also shown that, in both groups of cows, 24 hours   after calving, the number of total leukocytes and the number of segmented   neutrophils decreased, but the number of the non segmented neutrophils   increased. Based on this, we can conclude that cows with retained placenta   had no systemic inflammatory response during three weeks prepartal period,   but 24 hours after calving, systemic inflammatory response was documented in   all the cows. Moreover, the intensity of inflammatory response in cows with   retained placenta was not more pronounced in comparison to cows without   retained placenta. [Projekat Ministarstva nauke Republike Srbije, br. 175061

Peripartal leukogram in cows with and without retained placenta