Animal production sector generally and poultry sector particularly is considered one of the most important productive sectors that help in building the national and agricultural economy. The study aims to shed light on the most important technical coefficients and economic variables affecting the internal rates of return on investment in broiler farms in Egypt, it reached about 507.2 million broilers, and in Sharkia Governorate, it reached about 88.97 million broiler during the average period (2005-2018). And by studying the net cash flows, current and present, for the broiler farms during the life of the project according to the small, medium and large production capacities. the main results can be summarized as follows: the net current cash flows amounted to L.E. 4270, 7149 and 24784 thousand, respectively, for production capacities. While the present value of net cash flows amounted to about L.E. 706, 1613, and 6340 thousand, respectively, for production capacities. By studying the investment efficiency criteria in the broiler farms during the life span of the project according to the small, medium and large production capacities and the total sample, it was found that the value of internal rate of return amounted to about 17.7%, 24.7%, 32.5% and 27.9%, respectively. The value of the benefits-cost ratio amounted to about L.E. 1.16, 1.19, 1.29, and 1.24, respectively, while the net present worth amounted to about L.E. 705.8, 1613,3, 6339.8, and 8658.9 thousand, respectively. The capital turnover was about 5.65, 4.04, 3.08 and 3.59 years, respectively.