[Objective]The aim of this experiment was to investigate the effects of dietary apparent metabolizable energy(AME)level on growth performance,slaughter performance and plasma biochemical indices of Sansui ducks aged 1 to 28 days,and to estimate AME requirement based on regression model.[Method]A total of 336 healthy one-day-old Sansui male ducks were divided into 6 groups with 7 replicates per group and 8 ducks per replicate.Ducks were fed corn-soybean meal diets with AME of 10.92,11.38,11.80,12.26,12.68 and 13.14 MJ/kg,respectively.The experiment period was 28 days.At the end of the experiment,the production performance,slaughter performance and plasma biochemical indexes were measured.[Result]Dietary AME level significantly affected daily gain,feed conversion ratio and abdominal fat percentage(P＜0.05),and with the increase of AME level,daily gain showed a linear and quadratic trend of increasing(P＜0.05),feed conversion ratio showed a linear trend of decreasing(P＜0.05),and abdominal fat percentage showed a linear trend of increasing(P＜0.05).Dietary AME level had no significant effects on total energy intake,breast muscle percentage,leg muscle percentage,liver index and gizzard index(P＞0.05).Dietary AME level significantly affected plasma aspartate aminotransferase(AST)activity(P＜0.05),but had no significant effects on other plasma biochemical indices(P＞0.05).Based on broken-line linear regression,the minimum AME requirements of Sansui duck aged 1 to 28 days for optimal feed conversion ratio,daily gain,and abdominal fat percentage were 11.83,11.42 and 12.24 MJ/kg,respectively.[Conclusion]Dietary 11.38 MJ/kg AME could effectively improve daily gain,feed conversion ratio,and adbominal fat percentage.The optimal AME requirement of Sansui ducks aged from 1 to 28 days was 11.42 to 12.24 MJ/kg.
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