Abstract: The aim of this study is economic evaluation and investigation of some factors effect as season, demo-graphic characters (manager characters) and some productive and reproductive disorders in sheep production farms under Egyptian conditions. Data were randomly collected from commercial sheep farms from different localities in Menofia governorate that located in South of Nile delta in Egypt. The data include season that grouped to (cold season) extended from 21 September-20 March and (warm season) from 21 March-20 September to determine its effect on birth weight, litter size and kidding interval. The data were collected summarized and analyzed by statistical computer program (SPSS/PC, 16).