This study was to investigate the influence of housing system on ewe’s reproductive performance. Ninety five Farafra ewes were randomly assigned to six groups raised under six housing system, the housing types differed mainly in the type and highest of roofs, as follow 1) Semi open type house shaded with asbestos sheets (AS); 2) Semi open type house shaded with straw earth floors (S); 3) a close type shaded with single asbestos roof at 3 m height (single low type, SL); 4) a close type shaded with single asbestos roof at 5 m height (single high type, SH); 5) a close type shaded with double asbestos roofs at 3 and 3.5 m height for two roofs, respectively (double low type, DL); 6) a close type shaded with double asbestos roofs at 5 and 5.5 m height for two roofs, respectively (double high type, DH). Ewes were mated in May and lambing during October. Conception rate and embryonic mortality during mating season were determined using sonar on the 25th, 45th and 75th days after mating. Estrus duration length, number of ewes exhibited estrus, and weight at lambing was recorded and pregnancy period was calculated. ewes in closed houses had higher conception rate than that of semi open. No loss in embryos was detected in closed housing system as compared with two cases of loss in each of AS and S housing types. About 65.2 % of the total ewes had an estrus period length 24 hrs. to less than 36 hrs. Also, 20 and 21.05 % of ewes in AS and S houses had an estrus period length more than 36 hrs. About 3.3 % of total ewes had an estrus period length of 48 hours and more. Ewes in semi open houses (AS and S) represented about 66.7 % (2 from 3 ewes) of total number that showed the highest estrus period length (48 hours and more). Ewes in semi open types (AS and S) had higher number of service per conception than those in closed houses DL, DH, SL and SH (1.54 and 1.41 vs. 1.08, 1.14, 1.21 and 1.27, respectively). No significant influence of roof type or height on gestation length of ewes.