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Cow red cells are similar to cats and horses with regard to size and degree of anisocytosis
but they are resistant to rouleaux formation. The latter characteristic is the reason that
cow blood is very slow to settle out on standing. Cow red cells have a small area of central
pallor.
Platelets in ruminant blood are small, moderately variable in size, and distinctly granulated. Lymphocytes outnumber neutrophils in healthy cows, and are more variable in appearance compared to those of other species. 
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Last updated on Friday, February 16, 1996