The aim of this study was a comparison between sexed and conventional semen and some reproduction items in Iranian Holstein dairy farms in northeast of Iran. Data were collected from computerized management software of every herd from January 2006 through December 2008. All herds, 5–10 percentage of heifers were bred with sexed semen. The female calves were bred at age 14–15 mo with 126–130 Cm height. The diets were balanced to meet or exceed the minimum nutritional requirements of heifers for a gain 0.75–0.8 Kg/d (NRC 2001). The data were analyzed with ANOVA by using the general linear model of SAS 2003. The means were comparison by the Tukey method. The results have been shown in the Table 1.Therefore, sexed semen in a new tool for producing more female calves in commercial dairy herds.

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