Teores séricos de proteína total, imunoglobulina g e Cortisol em bezerros nelore, ao nascimento e às 24 horas De vida: influência do tipo e da duração dos partos

The serum levels of total protein (PT), immunoglobulin G (IgG) and cortisol of 251 Nelore calves, born from normal and dystocics calving or according the duration of the calving were evaluated. There were no statistically significant differences between the average contents of total protein in relation to the type or time of calving. The serum values of IgG were not influenced by the type of calving but by the duration of the calving, since the animals requiring from four to six hours to be born showed lesser IgG value (1.250 mg/dL) than those that were born in shorter time (3.200 mg/dL). The cortisol levels were not influenced by the type or duration of calving