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In order to study the effect of diluted diets in broiler chicks two experiments one in summer and the other in winter were conducted. In exp. males and females one - day old chicks housed separately. At first week of age the broilers were fed a standard starter diet, containing 3100 Kcal MEn/Kg and 22.3% CP (Nx 6.25). At first day of the second week (phase 1), each sex group was divided into 24 sub groups (20/each), with equal weight and housed separately, and 12 of them were randomly assigned to 4 dietary treatments (20/each) with 3 replications. The rest sub groups were fed, diet 1. The diets consisted of the diet 1 and three diluted diets with 20, 30 and 40% rice hulls, containg 2480, 2170 and 1860 Kcal MEn/Kg, and 17.8, 15.6 and 13.6% CP, respectively. In the first phase, the diets were fed from 7 to 14 day. The following week all the chicks again, received, the diet 1 from 22 to 35 day. The broilers were fed the stnadard Grower diet containing 3100 Kcal Men/Kg and 19% CP (diet 5). At sixth week (phase 2) the brids which received diet 1 at the second week of the exp., were fed diet 5 and the three diluted deits containing 2480, 2170 and 1860 KcaI MEn/Kg, and 15.5, 13.6 and 11.6% CP. (namely diet 6, 7 and 8). In the following two weeks all the broilers were received the standard finisher diet (diet 9) containing 3200 Kcal MEn/Kg and 18% CP. In exp. 2, all conditions were similar to exp 1, except, male chicks were used only. Exp 1, the average body weight (ABW) of male broiles (MB) which were fed diet 1, 2, 3 and 4 in phase 1, were 287, 275, 267 and 249g (P<0.05), and feed intake (Fl) were 228, 238, 264 and 287g (P <0.05) respectively. The ABW and Fl for female broilers (FB) were 262, 259, 251 and 245g and 219, 226, 242 and 287g (P <0.05), respectively. In phase 2, ABW
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and FT of MB were 2098, 2006, 1917 and 1906g (P<0.05), and 1148, 1206,
1231 and 1341g (P<0.05), respectivly. The ABW of FB were 1761, 1695, 1712
and 1561g (P<0.05) and FT were 897, 976, 1050 and 1047g (P<0.05) for diet
5, 6, 7 and 8, respectively. In whole period (56 days), ABW of MB were 3098,
3077, 3068 and 3120g, and FT were 5921, 5861, 6087 and 6220g (P<0.05),
while for FB were 2596, 2544, 2557 and 2502 (P<0.05), and 5084, 5089, 5390
and 5114 (P <0.05), respectivly. In the EXP. 2, in phase 1, ABW of MB were
332, 323. 314 and 289g (P<0.05), and Fl were 262, 292, 315 and 321,
respectively. In phase 2, ABWwere 2028, 1929, 1870 and 1791g(P<0.05),
and Fl were 1050, 1180, 1210 and 1221g(P<0.05), respectivly. For whole
period ABW and FT were 2997, 3003, 2936 and 2900g (P<0.05), and 1183,
1136, 1111 and 1O78g (P<0.05), respectively. In both experiments, increasing
dilution rate, the abdominal fat decreased. Slightly the results of this exp.
suggest that diluting diet with rice hullo up to 30% it seems to be beneficial.