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An analysis was made of 30 four-day-old ostriches to evaluate their protein, metabolite, mineral, and serum enzyme profiles, to correlate them with the birds' sex. The values obtained were: Total proteins 3.59±0.72g/dL, albumin 1.04±0.14g/dL, globulins 2.51±0.56g/dL, A:G ratio 0.43± 0.07, total cholesterol 615.10±101.15mg/dL, high density lipoprotein cholesterol (HDL-C) 132.72±20.33mg/dL, low density lipoprotein cholesterol (LDL-C) 454.93±90.81mg/dL, very low density lipoprotein cholesterol (VLDL-C) 27.45±9.96mg/dL, triglycerides 137.23±49.78mg/dL, uric acid 6.24±2.15mg/dL, urea 18.27±12.33mg/dL, creatinine 0.30±0.04mg/dL, total calcium 9.38± 0.76mg/dL, ionized calcium 7.17±0.64mg/dL, phosphorus 6.96±0.91mg/dL, Ca:P ratio 1.37±0.21, iron 24.74±13.02µg/dL, sodium 142.03±6.17mEq/L, chlorides 109.59± 4.99mEq/L, aspartate aminotransferase (AST) 200.67±31.42 U/L, alanine aminotransferase (ALT) 3.90±1.92 U/L, γ-glutamyltransferase (GGT) 1.18±0.73 U/L, alkaline phosphatase (ALP) 597.30± 231.36 U/L, and creatine kinase (CK) 2348.30±755.60 U/L. Males and females showed significant differences in total proteins, globulins, alkaline phosphatase, A:G ratio, and uric acid.A fim de avaliar o perfil de proteínas séricas, metabólitos, minerais e enzimas séricas e correlacionar com o sexo das aves, este estudo analisou 30 avestruzes de quatro dias de idade. Os valores obtidos foram: proteínas totais 3,59±0,72g/dL; albumina 1,04±0,14g/dL; globulinas 2,51±0,56g/dL; relação A:G 0,43± 0,07; colesterol total 615,10±101,15mg/dL; lipoproteína de alta densidade colesterol (HDL-C) 132,72±20,33mg/dL; lipoproteína de baixa densidade colesterol (LDL-C) 454,93±90,81mg/dL; lipoproteína de muito baixa densidade colesterol (VLDL-C) 27,45±9,96 mg/dL; triglicérides 137,23±49,78mg/dL; ácido úrico 6,24±2,15mg/dL; uréia 18,27±12,33mg/dL; creatinina 0,30±0,04mg/dL; cálcio total 9,38±0,76mg/dL; cálcio ionizado 7,17±0,64mg/dL; fósforo 6,96±0,91mg/dL; relação Ca:P 1,37±0,21; ferro 24,74±13,02µg/dL; sódio 142,03±6,17mEq/L; cloretos 109,59±4,99mEq/L; aspartato aminotransferase (AST) 200,67±31,42 U/L; alanina aminotransferase (ALT) 3,90±1,92 U/L; γ-glutamiltransferase (GGT) 1,18±0,73 U/L; fosfatase alcalina (ALP) 597,30± 231,36 U/L; e creatina quinase (CK) 2348,30±755,60 U/L. Diferenças significativas existiram para proteínas totais, globulinas, fosfatase alcalina, relação A:G e ácido úrico entre machos e fêmeas.