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Articles by Marziyeh Ghafari
Total Records ( 2 ) for Marziyeh Ghafari
  Marziyeh Ghafari , M. Shivazad , M. Zaghari and E. Seyfi
  In order to evaluate the effects of different levels of energy and methods of formulation of Amino Acid (AA) requirements of diets, this experiment was conducted using 392 broiler chicks. The experiment was carried out using a complete randomize block design with 7 levels of energy 3175, 3075, 2975, 2875, 2775, 2675 and 2575 kcal kg-1 for grower diet and 3225, 3125, 3025, 2925, 2825, 2725 and 2625 kcal kg-1 for finisher diet and two methods of formulation of diets AA requirements (total and digestible) as a factorial arrangement. Results showed that by increasing level of energy feed intake, body weight and FCR were promoted in grower diet (p<0.05). Effect of decreasing level of energy up to 2725 and 2825 kcal kg-1 was not significant on body weight and FCR in finisher diet, respectively. Formulating of diet based on total or digestible AA affected feed intake and FCR in finisher diet (p<0.05). Interaction effect of independent factors affected on body weight in grower diet (p<0.05). Decreasing level of energy increased gastrointestinal tract percentage weight (p<0.05). Formulation of diet based on digestible AA decreased gastrointestinal tract percentage weight (p<0.05). Abdominal fat decreased significantly as ME content of diets decreased. Results showed that it`s possible to reduce the level of energy up to 3175 kcal kg-1 in grower and 2725 kcal kg-1 in finisher diet for giving the best and economical performance response. Formulation of diet based on digestible AA in finisher diet resulted in promotion of performance.
  Marziyeh Ghafari , M. Shivazad and M. Zaghari
  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.
 
 
 
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