A bio-economic simulation model was developed to evaluate alternative management practices for smallhold mallard duck production systems in Iloilo province. Using 50 female day-old ducklings, the production system was simulated for 17 months. Two alternative management interventions were tested. Results showed an increase of 15% when management intervention I (complete confinement of ducklings during brooding stage) was applied. The layer population increased by 27% when ducklings were confined during brooding and partially confined during the growing periods. Findings of the study revealed that confinement was the best alternative management strategy to improve the production system of duck smallholders in Iloilo province.