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Articles by R. Taherkhani
Total Records ( 2 ) for R. Taherkhani
  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.
  Y. Ebrahim Nezhad , M. Shivazad , R. Taherkhani and K. Nazeradl
  A synergistic effect between Citric Acid (CA) and Microbial Phytase (MP) in improving phytate Phosphorus (P) utilization have been reported in broiler previously. In order to evaluate such additive effect in laying hen, an experiment was conducted using 224 Hyline-W 36 laying hen. Experiment began at 53 w of age and lasted in 64 w of age. The experiment was carried out using a completely randomized design with factorial arrangement (0 and 300 IU MP and 0, 20 and 40 g citric acid per kg of diet). Four replicate of 8 hens per each were fed dietary treatments including 1) Positive Control diet (PC) which meet NRC recommended available P level (0.3% available P), 2) Negative Control diet (NC) that was similar to PC diet except that available P was reduced by 0.2 %, 3) NC+300 IU microbial phytase per kg of diet, 4) NC+20 g CA per kg of diet, 5) NC+20 g CA+300 IU microbial Phytase per kg of diet, 6) NC+40 g CA per kg of diet, 7) NC+40 g CA+300 IU microbial Phytase per kg of diet. Dietary supplementation of MP to low available P diets significantly improved egg production and restored it to the level similar to PC group, but CA supplemented diets failed to create such effects. NC and diets with only CA supplementation had significantly lower feed intake compared to PC and MP supplemented diets. MP supplemented diets were used as efficiently as the PC diet, but CA had any effects on feed efficiency. Results obtained in our study suggests that contrary to the effects of CA in broiler chicks, CA couldn=t enhance phytase effectiveness in laying hen, probably due to high levels of Ca in laying hens diets.
 
 
 
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