Using complete diet and Sibbald methods to determine the metabolizable energy of 5 Iranian wheat varieties
2013
Seyedi, A Hasanzadeh | Janmohamady, H. | Hosseinkhani, A. | Shakouri, M.D.
To determine the ME contents of 5 Iranian wheat varieties (Alvand, Zarrin, Sabalan, Sardari, and Azar2), 2 experiments were conducted. In experiment 1, the AMEₙ content of 5 wheat varieties was determined by complete diet method containing 62.06% of a test cereal grain (with or without an appropriate commercial enzyme). Diets were consumed ad libitum by sixty 21-d-old Ross 308 male broiler chicks. The AMEₙ values (kilocalories per kilogram of cereal grain, DM basis) were determined from gross energy of diet and collected excreta during 56 h at the end of the experiment. In experiment 2, 36 adult roosters were used to determine the TMEₙ content of the varieties by the precision feeding method. The AMEₙ content was not significantly affected by varieties. The AMEₙ of wheat varieties without enzyme supplementation varied from 3,120 to 3,191 kcal/kg. The AMEₙ was significantly affected by enzyme supplementation. Enzyme addition produced an average increase of 11.45% AMEₙ content of wheat varieties. The TMEₙ of wheat varieties varied from 3,788 (Sabalan variety) to 3,947 kcal/kg (Zarrin variety), and TMEₙ content was affected significantly by wheat varieties. Strong correlation was seen between broiler chick performance and AMEₙ of wheat varieties that determinate with the complete diet method in wheat-based diets. It is suggested that the AMEₙ obtained from the complete diet method should be applied in young broiler diets formulation.
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