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This study has been conducted on one day old Japanese quail to determine the Effect of L-carnitine dietary supplementation on growth performance, carcass characteristics (hot carcass weights and yields), visceral organ masses (heart, liver, gizzard, and abdominal fat) and some biochemical parameters (cholesterol, triglyceride, Plasma total protein, albumin, glucose, aspartate aminotransferase (AST), alanine amino transferase (ALT)and uric acid concentrations) in Japanese quails with using four levels of L-carnitine.they were divided into five equalgroups the. first group fed on basal diet(without L-carnitine) act as control, second group fed on basal diet plus50mg L-carnitine /kg diet, third group fed on basal diet plus 100mg L-carnitine /kg diet, fourth group fed on basal diet plus 150mg L-carnitine /kg diet and fifth group. fed on basal diet plus 200mg L-carnitine /kg diet The obtained results revealed that final live body weight, body weight gain, and feed conversion ratio were improved significantly by using L-carnitine. The statical analysis of the obtained data showed that no significant difference between all groups in dressing percentage. However there were significant increase in breast muscle. with significant decrease in abdominal fat and heart weight in all treated

A total of one hundred and twenty 1-day-old apparently healthy Japanese quail were selected and randomly divided into 4 groups. Treatments were designed with four levels of crude protein (22.17, 24.2, 26.2 and 28%) respectively to study the effects of dietary crude protein level on growth performance, carcass characteristics , intestinal microflora, hematological parameters and some biochemical changes of growing Japanese quail. Results showed that growth performances parameters significantly improved as dietary crude protein level increased .The results indicated that dietary protein level beyond 24% has no beneficial effect on growth. Carcass traits results revealed that dressing percentage, breast muscles and leg muscles were increased significantly as crude protein level increased in the diet but weights of liver, heart gizzard and abdominal fat percentage were decreased significantly . Intestinal microflora count revealed that total aerobic bacteria, Coliform bacteria, Lactic acid bacterium and Escherichia coli increased significantly as crude protein level increased. Hematological examinations results demonstrated that hemoglobin concentration, red blood cells count, total leucocytic count , monocytes and lymphocytes were increased significantly as crude protein increased but basophils, eosinophils and heterophils were decreased significantly. Serum analysis showed that total protein, albumin and globulin in serum increased significantly as crude protein increased. It could be concluded that dietary level of 24% crude protein is recommended for growth performances and economic efficiency of growing Japanese quail because of increased dietary protein level beyond 24% % has no beneficial effect on growth.