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- Author or Editor: Luciana Caviglia x
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Abstract
ObjectiveāTo determine the reference interval for WBC counts in Holstein dairy cows from herds with high seroprevalence for antiābovine leukemia virus (BLV) antibodies, analyze the correlation of total WBC counts and blood proviral load (bPVL) in BLV-infected animals, and determine whether total WBC count can be used a hematologic marker for in vivo infection.
Animalsā307 lactating cows from 16 dairy herds with high BLV seroprevalence.
ProceduresāBlood samples were collected for assessment of plasma antiāBLV p24 antibody concentration (all cows), manual determination of WBC count (161 BLV-seronegative cows from 15 herds), and evaluation of bPVL (146 cows from another herd).
ResultsāThe WBC count reference interval (ie, mean Ā± 2 SD) for BLV-seronegative dairy cows was 2,153 to 11,493 cells/Ī¼L. Of the 146 cows used to analyze the correlation between WBC count and bPVL, 107 (73%) had WBC counts within the reference interval; of those cows, only 21 (19.6%) had high bPVL. Most cows with high WBC counts (35/39) had high bPVL. Mean WBC count for cows with high bPVL was significantly higher than values for cows with low or undetectable bPVL. White blood cell counts and bPVL were significantly (Ļ = 0.71) correlated.
Conclusions and Clinical RelevanceāThese data have provided an updated reference interval for WBC counts in Holstein cows from herds with high BLV seroprevalence. In dairy cattle under natural conditions, WBC count was correlated with bPVL; thus, WBC count determination could be a potential tool for monitoring BLV infection levels in attempts to control transmission.
