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Volumes and frequencies of blood that can be safely harvested from donor horses without detriment to donor.
| Blood Volume (BV)—8% BW (kg) |
| 20% of BV |
| Example: |
| 450 kg horse-circulating volume = 36 L |
| 20% of 36 L = 7.2 L |
| Alternately: |
| 10% BV every 4 weeks |
| 7.5% BV every 7 days |
| 1% BV every 24 h |
