This paper discusses the experimental findings on lay-ing quails when their diets were supplemented with iodine and starch mixture. Five groups of 120 comparable quails bred in the Omsk Region were formed; the sex ratio was 1:4. The first group was the control; the birds were fed the main diet without the iodine supplement; the 2nd, 3rd, 4th and 5th groups were trial groups where the main diet was supplemented with iodine (potassium iodide) + starch (1:4) immediately before feeding. The dosages of the tested product in the trial groups were as following (in terms of iodine, mg per 100 g of feed): the 2nd group -0.05; 3rd -0.075; 4th -0.10; 5th -0.125. The experiment lasted for 180 days. Throughout the experiment, the largest number of eggs was obtained in the 3rd trial group -15240 eggs, more by 18.1% than in the control group (P ≥ 0.99). The laying quail day egg production in the 3rd trial group was 25.4 eggs, more by 13.0% than that in the control group. In the 2nd, 3rd, 4th, and 5th trial groups, the average egg weight was less than in the control, respectively, by 4.5; 7.1 and 8.0%. The number of produced eggs in the 3rd trial group was more than in the control group by 17.0% (P ≥ 0.95), and the intensity of egg production -by 10.0%. The feed costs were lower in the trial groups by 0.16-15.57% for the production of 10 eggs; and for the production of 1 kg of eggs in the 3rd and 4th trial groups -by 9.08 and 3.12% than in the control. The profitability in the 3rd trial group made 54.2%; that was by 1.59% higher than in the control group. The optimal dosage of iodine as much as 0.075 mg per 100 g of complete feed was determined which contrib-uted to obtaining a greater economic effect in quail egg production.