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Articles by A. Aghaei
Total Records ( 8 ) for A. Aghaei
  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.
  K. Mohammadi , A. Aghaei , M. Bojarpour , Kh. Mirzadeh and Gh. Motaghinia
  The aims of this study were to investigate the importance of maternal effects and to determine the most appropriate model of analyses for early growth traits of Arabi lambs. Records of 2445 lambs from 139 rams and 804 ewes for Birth Weight (BWT) on 2237 lambs from 127 rams and 784 ewes for Weaning Weight (WWT) and on 2098 lambs from 115 rams and 739 ewes for Average Daily Gain from birth to weaning (ADG) were used in this research. The data collected from Animal Science Research Station of Agricultural and Natural Resources Ramin (Khuzestan) University during 2001-2008. Genetic parameters were estimated by derivative free restricted maximum likelihood method. Six different animal models were fitted by including or excluding maternal genetic effect, maternal permanent environmental effect and covariance between direct-maternal genetic effects. On the basis of log likelihood ratio test results, Model 3 which included direct genetic and maternal genetic effects was determined to be the most appropriate model for all traits. The maternal genetic effects contributed about 74, 69 and 64% to the direct genetic effects and 15, 11 and 10% to the phenotypic variance for BWT, WWT and ADG, respectively. Depending on the model, the estimates of maternal heritability ranged from 0.074-0.146 for early growth traits of Arabi lambs. Results showed that maternal genetic effects were important for pre-weaning growth traits and should not be neglected from the model; therefore inclusion of maternal effects into the model for mentioned traits is necessary.
  K. Mohammadi , M.T. Beigi Nassiri , J. Fayazi , H. Roshanfekr and A. Aghaei
  Genetic parameters and (co) variance components were estimated on 2445 lambs from 139 sires and 804 dams for Birth Weight (BW) on 2237 lambs from 127 sires and 784 dams for Weaning Weight (WW) and on 2098 lambs from 115 sires and 739 dams for Average Daily Gain (ADG). The data collected from Animal Science Research Station of Agricultural and Natural Resources Ramin (Khuzestan) University during 2001-2008. Analyses were carried out by Restricted Maximum Likelihood (REML) method. Six different animal models including or ignoring maternal genetic or permanent environmental effects were fitted for traits. The Model 3 with only maternal additive effects seemed most suitable. Influencing factors such as birth year, birth type, lamb’s sex and dam’s age were investigated as the fixed effects for the models. Estimates of direct heritability from model 3 were 0.194 for birth weight, 0.163 and 0.149 for weaning weight and average daily gain, respectively. Maternal heritability estimates for birth weight, weaning weights and average daily gain were 0.15, 0.11 and 0.09, respectively. For these traits, correlation estimates between direct additive and maternal genetic (ram) effects were high and negative ranging from -0.57 to 0.93. Bivariate analysis by Model 3 was also used to estimate genetic correlations between traits. The estimates of genetic, phenotypic and environmental correlations among traits were positive and intermediate to high in value. The results indicate that in addition to additive direct effect, additive maternal effect for all traits was important.
  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.
  M. Chaji , T. Mohammadabadi and A. Aghaei
  The aim of this study was to evaluate rumen bacteria activity on degradation of untreated Rice Straw (RS) and treated with low temperature steam, sodium Hydroxide (NaOH) and exogenous enzyme using disappearance of Dry Matter (DM) and Neutral Detergent Fiber (NDF) in rumen bacteria culture for 96 h incubation. Treatments were including; untreated RS, RS treated with low temperature steam (120°C for 120 min), RS treated with 80 g kg-1 DM NaOH, RS treated with 20 g kg-1 DM exogenous enzyme and RS treated with enzyme+NaOH. The result showed disappearance of dry matter after 96 h incubation by rumen bacteria was 60.3, 75.2, 85.3, 81.3 and 96.2 g/100 g for untreated rice straw and treated with steam, NaOH, enzyme and enzyme+NaOH, respectively. Sodium hydroxide, enzyme and steam caused to increase disappearance NDF of rice straw in media culture in compared with the other samples, 96 h after culturing and the highest increase of NDF disappearance was for rice straw treated with enzyme+NaOH (345.3 mg g-1) (p<0.05). Therefore, it may be resulted that low temperature steam, exogenous enzyme and NaOH influence the growth and activity of rumen bacteria on rice straw in compared to untreated RS.
  K. Mohammadi , M. Mamouei , M. Bojarpour , Kh. Mirzadeh and A. Aghaei
  The aim of the present study was to estimate variance components and genetic parameters for post-weaning growth traits of 2634 Zandi lambs from 202 sires and 1093 dams for 6 Month Weight (6MW) of 1893 lambs from 188 sires and 816 dams for 9 Month Weight (9MW) and of 1115 lambs from 156 sires and 514 dams for Yearling Weight (YW). Data and pedigree information used in this study were collected from Khojir Research Station (Tehran-Iran) during 1993-2008. Genetic parameters were carried out by Restricted Maximum Likelihood (REML) method, under six different single-trait animal models. Log likelihood ratio test indicated the most appropriate model for 6MW should included direct additive genetic effects as well as maternal permanent environmental effects whilst the most appropriate model for 9MW and YW had only the direct additive genetic effects. The effects of lamb’s sex, dam’s age and birth year were highly significant on all three traits (p<0.01) but birth type was only significant effect on 6 MW (p<0.05) and was no significant effect on 9MW and YW (p>0.05). Average weights were 27.55±0.09, 32.67±0.11 and 34.92±0.16 kg for 6MW, 9MW and YW, respectively. Estimates of direct heritability (h2) were 0.132, 0.134 and 0.133 for 6MW, 9MW and YW, respectively. The estimate of maternal permanent environmental variance as a proportion of phenotypic variance (c2) was 0.056 for 6MW.
  K. Mohammadi , M.T. Beigi Nassiri , H. Roshanfekr , K. Mirzadeh and A. Aghaei
  Data from body weights at post-weaning were used to genetic trend for Zandi sheep reared in Khojir breeding station of Tehran-Iran over a 16 years period (1993-2008) using animal model for lambs, rams and ewes. Genetic trends were estimated for 6 Months Weight (6MW), 9 Months Weight (9MW) and Yearling Weight (YW) traits. For investigation of each trait appropriate models using 3-trait analysis were applied. Breeding values of animals were predicted by Best Linear Unbiased Prediction (BLUP) methodology under three-trait animal models. Genetic trends of studied traits were estimated by regressing mean of breeding values on birth year. The genetic trends were positive and significant for 6MW, 9MW and YW and were 21, 72 and 65 g year-1, respectively.
 
 
 
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