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During the austral winter the appearance of the Magellanic penguin (Spheniscus magellanicus) is common on the southern coast of Brazil. The oil pollution constitutes a major cause of death of these birds. The monitoring of the weight and blood variables is important to make decisions during the rehabilitation and release of these animals. Thus, the aim of this study was to evaluate the relationship between the penguins' survival during rehabilitation and the values of hematocrit (Hct), total plasma protein (TPP) and body weight (BW) of the birds received at Centro de Recuperação de Animais Marinhos (Recovery Centre for Sea Animals) between 2006 and 2009. The analysis took place weekly, and penguins were classified according to the outcome of the rehabilitation process, when 101 specimens were rehabilitated and released, and 67 died. Released animals showed a decrease in the Hct in the second and third weeks (41±6% and 40±5% respectively) followed by recovery of the values in the fourth and fifth week (41±4% and 43±4% respectively). TPP levels increased steadily over the collections, stabilizing at 7.3±0.8g/dL in the fourth week. On the other hand, animals that died, although following the same response for TPP, showed no significant difference in Hct between collections, and showed a tendency for loss of BW in the last weeks of rehabilitation. The curves of BW and Hct during rehabilitation were considered a potential prognostic indicator of penguins in rehabilitation. Animals that arrived at the recovery centre with BW, Hct and TPP above 2.700g, 45% and 5.6 g / dL, respectively, have a greater chance of recovery, making these parameters crucial points in decision making regarding the treatment to be conducted during rehabilitation

Blood parameters and measurements of weight in the rehabilitation of Magellanic penguins (Spheniscus magellanicus, Foster 1781)