The feed restriction program is on of the main techniques in growth curve manipulation for increasing production efficiency in broiler chicken. Quantities and qualitative feed restriction are procedures that can be used to manipulate the feeding strategies of poultry in order to decrease growth and metabolic rate to some extent and so alleviate the incidence of some metabolic diseases such as ascites, lameness, mortality, and sudden death syndrome and so improving feed conversion and reducing feed cost. Also to produce a leaner bird and reduce the unfavourable effects of fat on human health, and to reduce fat deposition in broiler carcasses using of feed restriction programs can be profitable in broiler chickens production. This article surveys new findings in feed restriction of broilers and evaluates the application of feed restriction methods to broiler chicken production.

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Continuous genetic selection and improvement in nutrition have led to a very fast growth rate in modern strains of broiler chickens. Metabolic disorders such as ascits, sudden death syndrome and leg problems are related to a rapid early growth rate in poultry, especially in broilers, and their incidence can be decreased by slowing early growth. The use of management tools to reduce metabolic disorders that rely primarily on decreasing feed consumption, The feed restriction programs is on of the main techniques in growth curve manipulation for increasing production efficiency in broiler chicken in alleviate the incidence of some metabolic disorders and can be used to reduction the unfavorable effects of fast growth rate in broiler chicken production industry, and could be profitable in broiler chickens production efficiency. This article implicated on new findings in about different feed restriction programs effects on these problems in broiler chickens.

An experiment was conducted with 312 day-old male broiler chicks in grower phase (8-28d) to estimate the biological availability of four sources of zinc (Zn); zinc sulfate (ZnSO 4 ･H 2 O), two sources of zinc oxide (ZnO FG1 and ZnO FG2) and Bioplex Zn. Zinc sulfate was used as the standard in the bioavailability assay. Chicks were allotted randomly to 13 dietary treatments with 6 birds per replicate and 4 replicates per treatment, that included an unsupplemented corn-soybean meal basal diet (25.50 mg of Zn/kg of DM), or the basal diet supplemented with 100, 150 or 200 mg/kg of DM as either ZnSO 4 ･H 2 O (33% Zn), zinc oxide FG1 (72% Zn), zinc oxide FG2 (75% Zn) or Bioplex Zn (15% Zn). Dietary zinc level and source had no effect (P＞0.05) on feed intake or body weight gain of chicks during first and second weeks of experimental periods, but feed conversion ratio in the first and second week and feed intake, body weight gain or feed conversion ratio in third week and total experimental periods were significant difference between treatments (P＜0.05). Using the slope ratio methods from the regression of weight gain on supplemental zinc intake. The relative biological availability values using body weight gain were estimated to be 59, 99 or 45 for three levels of zinc oxide FG1, 64, 78 or 31 for three levels of zinc oxide FG2 and 151, 200 or 147 for three levels of Bioplex Zn, respectively. From the standpoint of bioavailability, Bioplex Zn was more available to broiler chicks than zinc from other sources and can be used by the feed industry as sources of supplemental zinc for broiler chickens.