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Articles by M. Zaghari
Total Records ( 5 ) for M. Zaghari
  M. Ghaffari , M. Shivazad , M. Zaghari and R. Taherkhani
  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.
  M. Ghaffari , M. Shivazad , M. Zaghari and R. Taherkhani
  In order to evaluate the effects of different levels of energy and method of formulation of Amino Acid (AA) requirements of diets, this experiment was conducted using 294 male broiler chicks. The experiment was carried out using a complete block design with a 7×2 factorial arrangement. Factors were included different level of energy (7 energy levels) and method of formulation of diets AA requirements (total and digestible). Method of formulation of AA requirement had no significant effect on cumulative feed consumption. Formulation of diet based on total or digestible AA had no significant effect on weight gain whereas high ME diets resulted in higher weight gain. Diets formulated based on total or digestible AA had feed conversion ratios that were not significantly different. 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 obtained in our study suggest that even whit corn soybean meal based diets, formulation of diets AA requirement may be a beneficial tool for optimization of performance.
  F. Zaefarian , M. Zaghari and M. Shivazad
  An experiment was conducted to determine the effects of dietary threonine (Thr) and crude protein (CP) on growth performance, gut measurements and morphology and to estimate Standardized Ileal Digestible (SID) Thr requirements of Ross 308 males at 0-21 days of age. The SID Thr levels were 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0 and 1.1% with two levels of protein 16 and 19%. Chicks were randomized into 64 battery pens (5 chicks per replicate). FI was lower for broiler given the high CP diets compare to those fed on the low CP diets. BWG and FCR improved up to 0.7% Thr in both CP levels. Weight gain improved non-linearly suggesting optimum dietary SID Thr levels between 0.89 and 0.84% (quadratic) at 16 and 19% ideal protein, respectively. Significant interaction was found between CP and Thr on relative weight and length of duodenum and jejunum (p<0.05). Thr supplementation had significant effect on villus height, epithelial thickness, goblet cell number and crypt depth in duodenum, jejunum and ileum (p<0.01). Low CP diets adequate in Lys, TSAA supplemented with Thr may result in optimal BWG and FCR as well as growth of intestinal length non-linearly. Parameters of gut functionality such as microvilli height, crypt depth and epithelia thickness seemed to be improved with even higher levels of dietary SID Thr level.
  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.
  M. Shivazad , M. Bejaei , R. Taherkhani , M. Zaghari and M.M. Kiaei
  An experiment was conducted to investigate the effects of glucose injection and feeding Oasis immediately posthatch on the subsequent performance of broilers. Experiment was carried out using a completely randomized design with factorial arrangement (2x2x2x2). Factors were included egg weight (small eggs weighting between 50 to 60 g and medium eggs weighting between 61 to 70 g), glucose injection (Control with no injection and 0.3 mL glucose injection), feeding in transportation boxes during shipping period (chicks fed Oasis and those hold with no access to feed and water) and house arrival feeding (chicks that receive feed immediately at arrival and those hold for an additional 12 h without feed). Treatments were replicated three times with 25 chicks per each. Live weight and feed intake were measured for each experimental unit at 7, 21 and 42 days of age and then weight gain and feed: gain was calculated. On days 3, 21 and 42, two chicks from each replicate were killed for carcass analysis including yolk sac residue weight (third day), duodenum, jejunum and ileum weight and length and also liver and gizzard weight. Results show an improved Weight Gain (WG) and feed efficiency (p<0.05) in chicks from medium eggs compared to those from small eggs. A significant interaction (p<0.05) between glucose injection and egg weight was observed, so that chicks of small eggs with glucose injection show a significant (p<0.05) depression in WG. Chicks with immediate access to Oasis had greater (p<0.05) duodenum and jejunum relative weight on day 3 and duodenum on day 42. Oasis fed chicks also had better WG and breast meat yield (p<0.05) while feeding Oasis did not influence feed efficiency. Feeding Oasis also increased yolk utilization. Chicks with delayed access to feed in the house compensate their initial decreased WG during the later stages. Glucose injection had no beneficial effect, but immediate access to feed in posthatch chicks improved their performance.
 
 
 
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