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ABSTRACT Linoleic (LA, 18:2) and alpha-linolenic (ALA, 18:3) acids are omega-6 and omega-3 polyunsaturated fatty acids considered essential to human and animal health. The optimum LA/ALA ratio for the production of fertile eggs in Japanese quail breeders has been little investigated. Thus, this study aimed to assess the effects of LA/ALA ratio on productive performance, egg quality, serum biochemical profile, body composition, and organ weight in Japanese quail. A completely randomized design was used. Birds were distributed into five treatments consisting of different LA/ALA ratios (1.48:1, 4.57:1, 7.63:1, 10.69:1, and 13.75:1), obtained by adding soybean (LA) and flaxseed (ALA) oils to the feed. Productive performance and egg quality were assessed in three cycles of 28 days each. At the end of the experiment, the birds were slaughtered and evaluated for biochemical profile, genital organ weights, and body composition. Data were subjected to analysis of variance and regression (p<0.05). LA/ALA ratio had no effect on productive performance or egg quality. Blood cholesterol in females and males and total triglycerides in females showed a quadratic response. Breeders fed the highest level of flaxseed oil (1.48:1) had the best serum levels of cholesterol and total triglycerides. Live weight and relative organ weights were not influenced by LA/ALA ratio. Differences in ash and crude protein levels were observed between groups, with LA increasing the deposition of these nutrients. It was concluded that LA/ALA ratio didn’t affect productive performance or egg quality. However, based on the results of body composition, serum triglycerides, and cholesterol, it is recommended to use an LA/ALA ratio of 1.48:1 in diets. LA, (LA 182 18 2 18:2 alphalinolenic alpha linolenic ALA, ALA (ALA 183 3 18:3 omega6 omega 6 omega- omega3 health LAALA investigated Thus profile composition used 1.481, 1481 1.48 1, 1 48 (1.48:1 4.571, 4571 4.57 4 57 4.57:1 7.631, 7631 7.63 7 63 7.63:1 10.691, 10691 10.69 10 69 10.69:1 13.751, 13751 13.75 , 13 75 13.75:1) feed each experiment p<0.05. p005 p p<0.05 . 0 05 (p<0.05) response 1.481 groups nutrients didnt didn t However 1.48: diets 18: 481 148 1.4 (1.48: 571 4.571 457 4.5 5 4.57: 631 7.631 763 7.6 7.63: 691 10.691 1069 10.6 10.69: 751 13.751 1375 13.7 13.75:1 p00 p<0.0 (p<0.05 14 1. (1.48 45 4. 76 7. 106 10. 137 13. 13.75: p0 p<0. (p<0.0 (1.4 p<0 (p<0. (1. p< (p<0 (1 (p< ( (p