Some plasmatic biochemical parameters of equines submitted to an endurance race of 30km, with controled speed between 12 to 14km/h, taken place at State of São Paulo, Brazil, were studied. Forty five adult equines (4 to 10 years old) were used. They were divided into three groups, according to the breed features: group I: 15 Arabian animals; group II: 15 Mangalarga animals; group III: 15 mixed breed animals. Each group was constituted by 11 males and 4 females. Blood samples were collected in three different times: before the race, 20 to 30 minutes and 80 to 90 minutes after the race, with the animal resting. Seric values of potassium, glucose and creatinine were similar in all groups but there was statistical significant differences according to time collection. Concerning to sodium, all groups showed a variation statistically significcant but the Arabian equines presented a different variation pattern from the other two groups. All groups showed the same variation pattern for seric urea but significant differences for seric urea levels were observed between Mangalarga and mixed breed animals.
equine; endurance; biochemistry
