title: Effect of energy levels of diets formulated on total and digestible amino acid basis on performance of female broiler.
abstract: In order to evaluate the effects of different levels of energy and method for formulation of Amino Acid (AA) requirements of diets, this experiment was conducted using 294 female broiler chicks. The experiment was carried out using a complete block design with a 7x2 factorial arrangement. Factors were included different levels of energy (7 energy levels) and formulation methods of diets AA requirements (total and digestible). Results showed that feed consumption decreased by increasing level of energy. Body weight and feed conversion ratio were promoted by increasing level of energy. Formulation methods of AA requirement had significant effect on cumulative feed consumption, weight gain (in grower period) and feed conversion ratio (p < 0.05). Interaction effects of independent factors affected on cumulative feed consumption, body weight and feed conversion ratio (p < 0.05). Abdominal fat pad were significantly lower in chicks fed diets formulated on digestible AA basis. Energy content of diets affected fat pad significantly. Abdominal fat pad increased significantly as ME content of diets increased. Results showed that formulation of diet on digestible AA contained the low energy resulted in promotion of performance.
authors.affiliation: Department of Animal Science, College of Agriculture, University of Tehran, Karaj, Iran.
authors.forename: Marziyeh
authors.initials: M
authors.lastname: Ghafari
authors.forename: M
authors.initials: M
authors.lastname: Shivazad
authors.forename: M
authors.initials: M
authors.lastname: Zaghari
mesh_terms: D000596:Amino Acids / Q000008:administration & dosage*; D000821:Animal Feed; D000818:Animals; D002645:Chickens / Q000254:growth & development*; D004063:Digestion; D004734:Energy Metabolism; D005260:Female
chemical_list: D000596:Amino Acids