University of Guilan Animal Production Research 2252-0872 3 2 2014 08 23 Application of different breeding goal functions in the progeny testing program of Iranian Holsteins Application of different breeding goal functions in the progeny testing program of Iranian Holsteins 1 7 179 FA F. Kanani Sarcheshmeh Greduated MS student, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran A. Shadparvar Associate Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran N. Ghavi Hossein-Zadeh Assistant Professor, Department of Animal Science, Faculty of Agricultural Sciences, University of Guilan, Rasht, Iran S. Joezy Shakalgorabi Assistant Professor, Faculty of Agriculture, Islamic Azad University, Shahr-e-Qods Branch Journal Article 2015 06 06 In the current study, a deterministic model was used to simulate various progeny test programs of Iranian Holstein in order to investigate the results of application of three different breeding goal functions. The goal 1 consisted only milk production, the goal 2 included milk and fat percentage and the goal 3 consisted herd life in addition of production traits. Per each goal function a selection index was established using production and type traits correlated with herd life. Selection accuracy in various selection paths varied from 52% to 94% with the lowest one belonging to goal 3 due to lower heritability for herd life. Genetic gain was 0.24, 0.24 and 0.15 time of breeding goal standard deviation for the goal 1, 2 and 3, respectively. Comparison of correlated economic response from three breeding goals showed that the goal 1 and 2, lacking herd life, had lower economic efficiency relative to goal 3. In the current study, a deterministic model was used to simulate various progeny test programs of Iranian Holstein in order to investigate the results of application of three different breeding goal functions. The goal 1 consisted only milk production, the goal 2 included milk and fat percentage and the goal 3 consisted herd life in addition of production traits. Per each goal function a selection index was established using production and type traits correlated with herd life. Selection accuracy in various selection paths varied from 52% to 94% with the lowest one belonging to goal 3 due to lower heritability for herd life. Genetic gain was 0.24, 0.24 and 0.15 time of breeding goal standard deviation for the goal 1, 2 and 3, respectively. Comparison of correlated economic response from three breeding goals showed that the goal 1 and 2, lacking herd life, had lower economic efficiency relative to goal 3. https://ar.guilan.ac.ir/article_179_3f6e11f2197d2441fde823908d990922.pdf