Some Sero-biochemical Reference Values of Working Donkeys (Equus asinus) from the Sudan

？Little biochemical information is available on donkeys, although donkey is one of the regular patients that regularly come to the veterinary clinics in the Sudan. Moreover, many researchers use the donkey as experimental animals. The aim of the present study is to avail data on sero-biochemical reference values of working donkeys in the Khartoum State. Ninety nine healthy adult male donkeys, 3-26 years of age, were employed in this study. Blood for serum was collected from the jugular vein of the examined animals. All sera were subjected to appropriate chemical analysis procedures and determined the following values: 0.07 ± 0.21 for creatinine, 13.81 ± 3.43 for urea, 0.73 ± 0.53 for uric acid, 164.84 ± 38.88 for potassium, 5.88 ± 1.95 for calcium, 3.13 ± 1.09 for sodium and1.69 ± 0.61 for phosphorus which were in the range of that reported for other serum levels for other donkey breeds (Sudanese donkey, Ethiopian donkey, Saudi Arabia donkey and Burkina Faso donkey). However, there are exceptions: Creatinine, urea, sodium and uric acid. This study showed that our results in comparison of traditional biomarkers reference ranges are similar. Therefore, more studies are needed to determine others parameters for donkeys and others country-specific parameters for donkeys