Determination and comparison of the estimating equitions of some Iranian wheat cultivars with the equitions and information of NRC based on the production performance of broiler

In order to determine the estimating equations of the apparent metabolisable energy corrected for the nitrogen (AMEn) in Iranian wheat cultivars and to compare these equations with the equation provided by NRC1994 as well as information of the NRC1994 table, two experiments were conducted. In the first experiment, the regression equations predicting AMEn for broiler chickens at age 10 and 24 days were evaluated by using twelve different Iranian wheat cultivars in two consecutive crop years and corresponding chemical composition and their AMEn. In order to verify the authenticity and accuracy the results of first experiment, a second experiment was conducted in a completely randomized design with four treatments and four replicates and using 256 ten days-old chicks Ross308. Wheat AMEn in the second experiment was calculated using four 1- NRC1994 Table 2- Regression equation provided by NRC1994 3- Biological methods in these study 4- Regression equations of the first trial. In the first experiment, regression equations used for predicting AMEn of wheat at 10 and 24 days of age were as follows: AMEn=37.289 NFE and AMEn=41.859 NFE. In the second experiment, the highest average live weight at 42 days belongs to the birds in fourth treatment (2542g) and lowest weight in first treatment (2266g). Traits related to performance in biological methods and equations obtained in the first experiment were better than the treatments derived from the regression equation by NRC and NRC tables (P