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Articles by M. Rezaei
Total Records ( 8 ) for M. Rezaei
  M. Rezaei , H. Nassiri Moghaddam , J. Pour Reza and H. Kermanshahi
  In a 2x3 factorial arrangement, the effects of dietary protein and lysine levels on performance and carcass characteristics of Ross male broiler chickens from 1 to 3 weeks and 4 to 6 weeks of age were tested. Dietary treatments consisted of three levels of L-lysine.HCl in starter and grower period (0.0, 1.5 and 3.0 g/kg) and two levels of protein (208.4, 178.4 in starter and 181.2, 161.2 g/kg in grower period) with 12.12 MJ AME/kg diet. Reducing dietary protein decreased weight gain in starter, grower and total period up to 6.0, 4.6 and 5.6% respectively (P<0.05). It also decreased feed consumption in starter period (P<0.05). Decreasing dietary protein had no significant effect on gain to feed ratio and breast meat yield, but increased abdominal fat percentage significantly (P<0.05). Increasing dietary lysine increased feed consumption in starter and weight gain, feed to gain ratio in grower and total period of the experiment (P<0.05). It also increased breast meat yield and percentage (P<0.05). N excretion reduced significantly by decreasing dietary protein (P<0.05). Dietary treatments had no significant effect on mortality.
  G. Rahimi , M. Rezaei , H. Hafezian and H. Saiyahzadeh
  In an experiment with complete randomized design, the effect of intermittent lighting (1 h L: 3 h D) was studied on performance of 400 broiler chicks from 10 to 42 d of age. During of the experiment feed intake, body weight, feed conversion ratio were measured weekly. Mortality was measured throughout the experiment. At 42 d of age 10 chicks from each treatment were slaughtered for abdominal fat weight. There wasn`t significant difference for body weight at 42 d between treatments. Use of intermittent lighting schedule improved feed conversion ratio significantly (P<0.05). Due to decrease fat deposition, intermittent lighting program reduced abdominal fat percentage (P<0.05). There wasn`t significant difference between treatments for mortality. In conclusion, since physical activity is very low during darkness, and energy expenditure for activity is reduced, therefore use of intermittent lighting program enhanced production efficiency, reduced room temperature and cost of electricity.
  A. Teimouri , M. Rezaei , J. Pourreza , H. Sayyahzadeh and P.W. Waldroup
  The effect of energy and protein dilution in the starter period (8 to 14 days) of age, on performance and carcass characteristics of 360 Arian male chicks was studied in a completely randomized design. This experiment consisted of 6 treatments, 4 replicates, with 15 chicks per replicate. In order to dilute the diets six levels (0, 4, 8, 12, 16, and 20) percent of ground wood charcoal was used. Chicks were fed with starter and grower diet from 15 to 21 and 22 to 42 days of age respectively. During the experiment feed intake, body weight gain, feed conversion ratio were measured weekly. Mortality was measured throughout the experiment. At 43 day of age 4 chicks each treatment was selected and carcass characteristics were measured. The results indicated that dilution of diet from 8 to 14 days of age increased feed intake in this period but, the differences were not significant. With increasing dilution rate body weight gain of chicks significantly decreased in comparison to control group (P< 0.05). Due to compensatory growth after restricted period, there was not significant difference in body weight among restricted and control groups at 42 days of age. There was not significant difference among the treatments for feed conversion ratio in whole period of the experiment (8 to 42 day). Similarly, there was not significant difference among the treatments for caloric conversion ratio in whole period of the experiment (8 to 42 day). Mortality rate in restricted groups was significantly lower than control group (P< 0.05). Diet dilution hadn`t significant effect on carcass, breast meat, drumsticks, thighs, liver, intestine, abdominal fat percentages. The results of the present study indicated that broiler chicks can withstand a 7-day period (from 8 to 14 days) feed restriction with ground wood charcoal in early age without loss in performance.
  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.
  N. Bidar , M. Rezaei , H. Sayyah Zadeh and H. Kermanshahi
  The effect of feeding pre-starter diet during three periods (4, 7 and 10 days) with different sodium levels (0.15, 0.30 and 0.45%) on performance, carcass characteristics and serum electrolytes levels, in a completely randomized design and 42 days of study, 240 Ross (308) male broiler chickens were evaluated in a factorial arrangements of 3*3. By increasing sodium levels, dietary electrolyte balance increased (200, 250 and 300 mEq kg 1). Treatments were compared with a control diet (starter diet with 0.20% sodium). Chickens were fed with starter diet to 21 days of age after feeding pre-starter diet. The results indicated that feeding pre-starter diet during 7 and 10 days increased feed intake and decreased feed conversion ratio at 42 days of age when compared with that of starter diet (control diet) (p< 0.05). Feeding pre-starter diet during 7 and 10 days increased feed intake in starter period and weight gain in first 4 weeks of study (p< 0.05). Feeding pre-starter diet with 0.30% sodium and 250 mEq kg 1 dietary electrolyte balance increased feed intake in first 2 weeks and weight gain in starter period (p< 0.05). Feeding per-starter diet with 0.30% sodium and 250 mEq kg 1 dietary electrolyte balance during 10 days showed the lowest feed conversion ratio in second and fourth weeks of study (p< 0.05). There was no significant difference among the treatments for mortality, serum electrolytes levels and carcass characteristics at the end of experiment. The results of the present study indicated that feeding pre-starter diet with 0.30% sodium and 250 mEq kg 1 dietary electrolyte balances for 7 days have positive effects on performance especially in first weeks of life.
  M. Ghasemkhani , S. Firouzbakhsh , M. Rezaei and H.R. Sadeghipour
  A cross-sectional study was conducted in a group of 880 workers employed in industries workers south of Tehran. Pulmonary function test was measured among 224 of suspected respiratory abnormalities workers. In pulmonary function test of subjects, 147(68.0%) had normal while 77 (32.0%) showed reduced. There were statistically significant differences between mean measured and predicted values in terms of FEV1 and FVC (p<0.0001), PEFR (p<0.006). The highest percent of respiratory disorders were among workers food, drink, tobacco, construction and metal industries with 24.7, 20.8 and 18.1%, respectively. It is recommended that engineering measures be adopted to reduce the harmful materials in industries, together with health monitoring of exposed employees. All workers who are exposed to harmful materials should be given regularly scheduled lung function tests. This exam is a valuable tool in a full program for detecting and preventing serious occupational lung diseases.
  M. Rezaei , A. Attar , A. Ghodratnama and H. Kermanshahi
  An experiment was conducted in order to study the effect of 3 levels of fat (1, 3, 5%) and 2 levels of L-carnitine (0 and 250 mg kg-1) on 360 male Ross broiler chicks in a factorial arrangement (2x3) with completely randomized design with 6 treatments, 4 replicates and 15 chicks in each replicates. All diets were isocaloric and isonitrogenous and were fed to chicks from 1 to 42 days of ages. During the experiment feed intake, body weight gain and feed conversion ratio were measured weekly. Mortality was measured throughout the experiment. At 42 days of ages 4 birds from each treatment were slaughtered for determination of carcass characteristics and serum composition. Data of the experiment were analyzed by GLM procedure of SAS. Increasing of fat in the diets significantly improved performance of chicks in grower (22 to 42 days) and whole period (1 to 42 days) of the experiment (p< 0.05). Chicks fed with diets containing 3% fat had the highest breast meat and lowest abdominal fat percentage (p< 0.05). Adding L-carnitine to diets had not significant effect on performance and carcass characteristics. Interaction between fat and L-carnitine was significant on liver weight (p< 0.05). The levels of triglyceride (TG) and glucose in blood serum were affected by increasing of dietary fat (p< 0.05). Adding L-carnitine to diets significantly decreased the level of serum triglyceride, cholesterol and VLDL (p< 0.05). Dietary treatments had not significant effect on mortality.
  H. Sayyazadeh , G. Rahimi and M. Rezaei
  The use of enzymes has been common in many industries for many years. More recently, the animal feed industry began to incorporate specific enzymes in the animal and poultry feed. The main goals of enzyme supplementation of poultry diets have predominantly been related to the hydrolysis of fiber or NSP fraction in cereal grains. The purpose of the present study was to investigate the effect of exogenous enzyme supplementation of maize, wheat and barley-based diets on broiler performance. A total of 720 one day-old broiler chicks (Arian breed) were allotted at random in equal numbers in floor pens (3 pen/treatment) and fed with 8 different ingredient diets. Broiler diets were prepared based on: a standard maize based diet (M); maize plus enzyme (ME); barley plus enzyme (BE); wheat plus enzyme (WE); maize-barley plus enzyme (MBE); maize-wheat plus enzyme (MWE); wheat-barley plus enzyme (WBE) and maize-wheat-barley plus enzyme (MWBE). From day 7 onwards and repeated weekly body weight gain, feed intake, feed conversion, mortality was determined. At the end of rearing period six chickens per treatment were slaughtered and carcass yield, abdominal fat pad content, intestine`s weight and size changes were measured. The result gives an impression that no significant differences were found in terms of live weight, feed intake, feed efficiency and chick`s survivability between enzymes treated and control diets. Dietary enzymes had no effect on gizzard and liver weight, carcass yield and abdominal fat pad contents. Enzyme supplementation, however significantly influence the weight but not the size of intestine. It has been shown that adding of enzyme to the feeds based on cereal grains with higher fiber contents improve the performance of broiler chicks to the levels at least as those obtained with maize based diets. The obtained results at the present study indicate the anti-nutritive effects of SNP on the performance of broilers were overcome by adding of enzymes.
 
 
 
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