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All horses with the exception of miniatures have roughly 9 gallons of blood inside their body at any one time. During rest the number of Red Blood Cells is at about 35% of the total blood volume, which would equal 3.15 gallons. During strenuous exercise it increases to 65% of the blood volume, which would be 5.85 gallons. The rest of the blood will be made up of White blood cells and Plasma.

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12y ago

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