This resulted in a decrease in haematocrit. It is calculated by dividing the haemoglobin by the haematocrit. The haematocrit and haemoglobin content decreases till 20-30 days after birth. The common ostrich also experiences an increase in haematocrit, resulting in a hypovolemic state. According to Fanini, Forconi's haematocrit value the previous day was only 47 percent. Rijkaert would not let the riders blood haematocrit level go above 53-54%. The Haematocrit Centrifugation Technique (HCT) is a much better alternative. Testers set a haematocrit limit of 50 per cent and "rested" riders who exceeded it.