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Asian Journal of Poultry Science
Year: 2007  |  Volume: 1  |  Issue: 1  |  Page No.: 16 - 21

Effect of Energy Levels of Diets Formulated on Total or Digestible Amino Acid Basis on Broiler Performance and Carcass Trait

M. Ghaffari, M. Shivazad, M. Zaghari and R. Taherkhani    

Abstract: An experiment was conducted to investigate effects of different level of ME in diets of as hatched broiler chicks with respect to method of formulation of Amino Acid (AA) requirement based on total and digestible AA requirements. The experiment was carried out using a complete block design with factorial arrangement. Main factors were included method of formulation of AA requirement (total and digestible) and different ME level (7 dietary ME from 3175 Kcal diluted to 2575 Kcal). Experimental period began at 10 days of age and lasted in 47 days of age. Weight gain and feed consumption were recorded for grower (10-28 days of age) and finisher (28-47 days of age) separately and then feed conversion ratios were computed. In grower period chicks received high ME diets had significantly lower feed intake, but they had higher weight gain and they also utilized their feed more efficiently compared to those received lower levels of ME. Method of formulation of AA requirement had no significant effect on none of the measured parameters during grower period. In finisher period, chicks fed diets formulated on digestible AA requirement had significantly lower feed intake and feed conversion ratio. Different levels of ME had no significant effect on feed intake and weight gain during finisher period. Results obtained in present study suggest that whereas method of formulation of AA requirement in grower period have no beneficial effect, formulation of diets based on digestible AA is advantageous in finisher period.

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