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Articles by M. Zaghari
Total Records ( 3 ) for M. Zaghari
  R. Taherkhani , M. Shivazad , M. Zaghari and A. Zare Shahneh
  A chick bioassay with chemically defined amino acid (AA) diets was conducted to compare four different AA profiles: the NRC (1994), Feedstuff, Rhone Poulenc Animal Nutrition (RPAN) and Illinois Ideal Chick Protein (IICP) AA profiles. The ideal ratios of IICP, RPAN and Feedstuff calculated using digestible AA requirements and total AA requirements used for NRC. This battery study involved male and female chicks during 7 to 21 days of age. Indispensable AA were rationed to lysine according to requirement ratios presented in the four profiles. Digestible lysine set at 1.07 and 0.98 % of diet for male and female, respectively. All diets were kept isonitrogenous (2.6 % N) by varying levels of L-glutamic acid. All diets were checked to have at least 0.3 % proline and 0.6 % glycine. Diets for all profiles contained 3200 kcal ME/kg and a positive control diet was used according to NRC (1994) recommendations. Chicks fed a common corn-soybean meal diet for 160 h and were raised in the floor pen. Then chicks weighed individually and allocated to battery pens so that most uniformity among pens occurs. Four battery pens of five chicks were fed one of four different profiles or positive control diet in both sexes. Weight gain and feed intake were measured for each pen at day 21 and then feed:gain was calculated. Results indicate that chicks fed positive control diet weighed more (p< 0.5). Among semi purified diets chicks fed diets formulated with NRC (1994) ideal AA ratios had significantly (P< 0.5) better weight gain and feed:gain in both sexes relative to IICP and RPAN, but not to Feedstuff .RPAN had worst weight gain and feed:gain in females . Results of this experiment suggest that new ideal ratio of threonine (relative to lysine) in IICP for starter period may be under-estimated.
  M. Rezaei , S. Borbor , M. Zaghari and A. Teimouri
  An experiment was conducted to determine the effect of phytase supplementation on broiler performance and evaluation of nutrients equivalency for Natuphos phytase, using 640 day-old commercial broiler chickens from 1 to 49 days of age. The experimental units were allocated randomly to 4 dietary treatments x two sexes with 4 replicates per treatment. The first dietary treatment formulated without phytase, the second one contained 500 FTU/kg phytase, and the third one contained 500 FTU/kg phytase which was calculated half of the nutrients equivalency values for phyatse. The fourth dietary treatment contained 500 FTU/kg phyatse which was calculated the total nutrients equivalency values for phytase. During the experiment feed intake, body weight gain, and feed conversion ratio (FCR) were measured in each phase of the rearing. Mortality was recorded throughout the experiment. No significant difference was observed among four dietary treatments for final body weight, feed conversion ratio and carcass characteristics (p>0.05). The results indicated that phytase increased the availability of nutrients in third and fourth treatments. Toe ash, and toe ash Ca and P percentage increased with the addition of phytase in both sexes (p< 0.05), but had no significant effect on blood phosphorus concentration.
  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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