Background: This study was conducted to determine the effect of particles size of starter diet on growth performance of broiler chickens. Methods: A total of 384 Arbor Acres broiler chicks were usedin a completely randomized design with three treatments and four replicates of 32 birds each.Birds were fed diets with 3 particles sizes of starter diet (T1: 1.0 mm; T2: 0.8 mm; T3: 0.7 mm) during the first week of life. At 7 d, the same starter diet was offered in a crumbled form until 10 d of age. Then, common grower and finisher diets were provided in a pelleted form. Body weight (BW), feed intake (FI), feed conversion ratio (FCR) and mortality rate were evaluated at 7, 14 and 42 days of age. Result: The results showed thatchicks receiving diet with intermediate particles size (0.8 mm) had the higher BW at 7 and 14 d. The FCR was also improved (-6.25%; P less than 0.01) with the same diet at 7 days of age. No feed particle size effect for FIand mortality was observed throughout the 42 d trial. In conclusion, birds fed intermediate particles size (0.8 mm) diet showed better FCR and BW at starter phase. However, no significant effect was observed at slaughter age.
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