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Articles by M. Nazari
Total Records ( 7 ) for M. Nazari
  F. Salabi , M. Bojarpoor , M. Nazari and S. Tabatabaie
  We conducted this research to determine dry matter digestibility of triticale grain, barley grain and naked barley grain by using in vitro Tilly and Terrey (TT) technique. A simple technique for the determination in vitro of digestibility of small (0.5 g) samples of dried cereal grain. It involves incubation first with rumen liquor and then with acid HCL and pepsin enzyme. In vivo digestibility (Y), the regression equation Y = 0.99 X-1.01 (SE±2.31) has been calculated, where X = in vitro digestibility. An experiment was carried out in a complete randomized design with 3 experimental groups and 9 replications per groups. The treatments were included triticale grain, barley grain and naked barley grain. Analysis of variance was performed with SAS software and the differences among means were evaluated by using the Duncan's tests. According to these results, in vitro and in vivo digestibility of triticale grain were more significantly than barley grain and grain (p<0.01). The result of this experiment indicate increasing digestibility as substitute triticale grain instead of barley grain.
  M. Nazari , M.T. Beigi Nassiri , J. Fayazi and S. Tabatabaei
  In order to estimate variance components 8843 test day milk and fat yields records from first lactation Najdi cattle were used. Data obtained between years of 1989-2005 by animal breeding station of Najdi cattle located in Shooshtar city. Random regression models were studied in respect of different orders of fitting for fixed and random regression. Also, different methods of residual variance in the statistical model assume that included assumption of constant residual variance and different assumption about variable residual variance during lactation. According to the obtained results, the assumption of heterogeneous residual variance during lactation improved characteristics of statistical model. A suitable model with (3, 3) orders of fit for additive genetic and permanent environmental covariance functions to analyze TD fat and milk yield records were recognized. Minimum of heritability for fat and milk yield was estimated at the beginning of lactation (0.1, 0.15), respectively. The amount of this parameter increased to mid lactation and almost in the 5th month of lactation reached to maximum level (0.34 for milk yield and 0.44 for fat yield), then decreased to the end of lactation.

Key words: Random regression, milk and fat yields, Najdi cattle, residual variance, Iran

  A. Aghaei , S. Tabatabaei and M. Nazari
  The aim of this study was to evaluate the correlation between cooper, zinc, calcium, sodium and potassium concentration of seminal plasma and spermatozoa progressive motility percent in rooster. Seventeen Indigenous broiler breeder Roosters were used. According to spermatozoa motility, roosters were classified to 3 treatment groups with low, medium and high progressive motility percent. Seminal plasma from all groups was obtained with centrifuge of semen samples. Cooper, Zinc, Sodium, potassium and calcium concentrations in seminal plasma samples were determined on the atomic absorption spectrophotometer. There was positive correlation between cooper and zinc concentrations of seminal plasma and progressive motility percent of spermatozoa. There was no significant correlation between sodium concentrations of seminal plasma and progressive motility percent of spermatozoa. There was negative correlation between low/medium progressive motility rate groups and high motility group. While this correlation for calcium concentration was positive.
  M. Nazari , Jamal Fayazi , S. Tabatabaei , A. Aghaei and Morteza Mamoei
  The main objective of this study was to estimate genetic and phenotypic potential of milk yield, fat yield and fat percentage traits. Data analyzed were 3350 records from buffalo during 1989-2008 were collected. Co-variance components were estimated using uni and multiple traits of animal model with the Restricted Maximum Likelihood method. In this method with constant effects of season-city-year and lactation period and additive genetic was taking as Random effect. The mean and standard deviation for milk yield, fat yield and fat percentage were 964.14±18.28, 52.35±1.88 and 5.58±0.03, respectively. The heritability of milk yield, fat yield and fat percentage were 0.22, 0.18 and 0.13, respectively using univariate model. The repeatability of milk yield, fat yield and fat percentage were 0.55, 0.41 and 0.39, respectively using univariate model. The genetic and phenotypic correlation between milk yield-fat percentage, milk yield-fat yield, fat yield-fat percentage was -0.25 and -0.30, 0.75 and 0.25, 0.29 and 0.41, respectively. The heritability for milk yield trait was moderate, so selection on the basis of this trait may cause a desirable genetic gain.
  A. Aghaei , S. Tabatabaei , M. Chaji and M. Nazari
  This study was conducted to evaluate the effects of adding levels of dried whey powder and probiotic to practical-type diets on the performance and Intestinal micro organism of laying hen’s. Dried whey was used in isocaloric and isonitrogenous diets at levels of 0, 2.5, 5 and 7.5% with two Level of probiotic (0 and 1000 g-1 Bioplus 2B ton-1 feed providing 0 and 3.2x106 cfu g-1 Feed concentration). About 72 white leghorn Hy-Line, w-36 strain used in experiment. Adding dried whey powder and probiotic to the diets caused highly significant increase (p<0.05) in egg production and lactobacillus in ileum but significant decrease (p<0.05) coliform in ileum. Using dried whey and probiobic improve egg weight, egg mass, shell thickness, shell hardness and Haugh unit but not significant (p>0.05). Level of 5% dried whey had significant decrease feed conversion (p<0.05). Other traits did not show significant different by using dried whey and probiotic.
  F. Salabi , M. Boujarpoor , J. Fayazi , S. Salari and M. Nazari
  About 288, 1day old Ross 308 broiler were used to evaluate the effect of zinc on performance and carcass characteristics of broiler during Heat Stress (HS). Broilers raised in either a thermoneutral (TN, 23.9°C constant) or HS (23.9-35°C cycling) environment were fed an adequate zinc diet (45 mg kg-1) and high zinc diets (90 and 135 mg kg-1), accomplished by adding a zinc from ZnSO4.7H2O to the ration. The HS birds consumed less feed, gained less weight and had lower feed efficiency when compared to TN birds. Dietary zinc levels did significantly influence broiler growth performance. Lymphoid organs, breast and leg meat yield and liver weights were all reduced by HS. These results indicate that the performance, carcass characteristics of broiler and immune response of broilers can be influenced by the level of zinc in the diet and by environmental conditions.
  R. Ziaie Moayed , M. Nazari and M. Kamalzare
  Gabric dam which is placed at Hormozgan, Iran has height of 41 m and is placed on an alluvium layer with 13 m thickness. One of the design alternatives for this construction is embankment dam with asphalt core. Regarding to design condition, the asphaltic core has been placed over alluvium foundation and cutoff wall has been contrived for seepage control. Whereas the asphaltic core posed over cutoff wall and shell posed over alluvium foundation, unsymmetric settlements at constructions was expected during construction and sluicing periods which can affect the behavior of asphaltic core. In order to obtain a clear understanding of this behavior, two dimensional finite element analyses have been performed and different contours for stresses and displacements have been presented. Due to obtained results the effect of core deformation modulus, stiffness of coarse grain alluvial foundation and removal of fine grain alluvial on principle stresses, principle shear stresses and vertical and horizontal strains have been investigated. Also, vertical stress distribution at the end of construction and vertical and horizontal displacements after sluicing have been studied. Results show that vertical stress values in asphaltic core reach two times of overburden pressure that indicates considerable load transfer to asphaltic core and maximum vertical displacement of asphaltic core in the end of construction was 0.22 m while horizontal displacement of asphaltic core is negligible. Also, the results reveal that removal of alluvial layer from beneath of down-stream shell will not assist adjustment of stresses and strains in core.
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