An experiment was conducted to study the effects of soybean, linseed and sunflower oil (various sources of fatty acids) with and without L-carnitine supplements (0 and 50 mg kg-1) on performance, blood biochemical parameters and carcass traits of Japanese quail. One hundred and ninety-two of 7-day old female Japanese quail were randomly assigned to 6 dietary treatments with 4 replicates and fed in the duration of 28 days. A 3 × 2 factorial arrangement (three oil sources and two levels of L-carnitine) was used in a completely randomized design with 8 birds per cage. Feed intake (FI), body weight gain (BWG) and feed conversion ratio (FCR) of birds were measured during the experiment. Moreover, 2 birds from each cage (replicate) were randomly selected at the end of the experiment and then the concentration of cholesterol, albumin and total protein of blood sera were measured. Results showed that BWG and FCR were affected by dietary treatments and BWG of quails significantly increased by the addition of L-carnitine to linseed oil treatment (P<0.05). Different types of vegetable oil and L-carnitine supplementation had no significant (P>0.05) effect on liver and gizzard of quails. Linseed and sunflower oil increased heart weight of quail. Addition of L-carnitine to diet, containing sunflower oil reduced the relative weight of liver and heart. Sunflower oil reduced the concentration of total protein and albumin in blood serum of birds. L-carnitine supplement increased the concentration of total protein and globulin in female blood serum. Data of the present experiment showed that source of dietary oil affected the performance of Japanese quail and also use of different plant oil sources with L-carnitine supplementation affected the blood biochemical parameter of female Japanese quail. تفاصيل المقالة