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Articles by Alireza Seidavi
Total Records ( 5 ) for Alireza Seidavi
  Alireza Seidavi
  The aim of the present study was generate data on Bombyx mori feeding and nutritional indices and characteristics during 1st-5th larval instars and comparison of these parameters among eight commercial hybrids. All insect rearing and experiments were done under special laboratory conditions. The several parameters such as quantity of food consumed, fecal matter excreted and larval growth was determined based on fresh (wet) and dry weight. The experiment was set in a completely randomized design. Also, evaluation index value and sub-ordinate function value were calculated for nutritional indices. From obtained results, gain for total instars (1-5 instars) was maximal in 104x103 (0.67 g DM/larva) and minimum in 151x154 (0.56 g DM/larva). In all the hybrids, ingested food for total larval duration was observed to be above 5.8 g DM/larva. Highest food consumption was recorded in 31x32 (6.31 g DM/larva) followed by 32x31 (6.30 g DM/larva) and 104x103 (6.22 g DM/larva), whereas lowest was recorded in 151x154 (5.80 g DM/larva) followed by 154x151 (5.82 g DM/larva). ECI for total instars (1-5 instars) was maximal in 151x154 (10.35) and minimum in 153x154 (8.37). In all larval duration, approximate digestibility was observed to be above 0.47. Highest AD was recorded in 154x151 (0.507) followed by 153x154 (0.505) and 31x32 (0.504), whereas lowest was recorded in 104x103 (0.475) followed by 103x104 (0.476). After evaluation by both the statistical methods (evaluation index method and sub-ordinate function method), hybrids of 31x32, 104x103 and 32x31 were identified as potential hybrids for further development at distribution between farmers.
  Alireza Seidavi
  This study was conducted to analyze genetic parameters in six commercial Iranian silkworm pure lines including Japanese origin pure lines of 31, 103 and 107 and Chinese origin ones of 32, 104 and 110. All stages of rearing, recording and collecting data were performed over four rearing periods. Quantitative traits of Cocoon Weight (CW), Cocoon Shell Weight (CSW) and Cocoon Shell Percentage (CSP) were evaluated in this study. Covariance components of the characters are estimated by means of REML method. It is estimated heritability, phonotypical, environmental and genetical correlations using DFREML software package. From obtained results, genetic parameters including heritability and genetic correlation for economical trait were different significantly; hence it must be applied appropriate breeding strategies in each pure line. Cocoon weight and CSW heritability was higher than CSP one. Additive genetic correlation between CW-CSW, CSW-CSP and CW-CSP was high, medium and low, respectively. From obtained results, response to selection for cocoon weight and cocoon shell weight are higher than cocoon shell percentage since latest trait had lower heritability. Therefore, it is expected correlated traits improve using selection based on cocoon shell weight. Furthermore, genetic trend of traits were negative and significant at non-selected populations. Phenotype trend of traits also were negative and significant at selected and non-selected populations which is cleared environmental conditions decline at improvement generations.
  Ehsan Vaez Jalali , Alireza Seidavi and Abolghasem Lavvaf
  This experiment was performed to estimate some important indicators of performance on commercial silkworm hybrids and to compare commercial hybrids of Iran silkworm due to its production characteristics and study of superior hybrid selection and performance. In this experiment, eggs of eight commercial silkworm hybrids including hybrids of 104x103, 103x104, 32x31, 31x32, 154x151, 151x154, 154x153 and 153x154 as a treatment in the form 4 repeats was used and every repeat was involved 50 Lavrhybrids. After nurturing hybrids and gaining different characteristics records, first variance analysis and average comparison of traits was performed then we use two methods of assessment index and sub-ordinate function to integrate and aggregate. According to the results based on evaluation index method, hybrid 154x151 with the 799.4063 score gains the highest rank and then it was the 31x32 hybrid. Hybrids 104x103 and 153x154 also obtained the lowest score. According to the Sub-Ordinate Function 31x32 hybrid also obtained the highest rank with 13057.43 score. About 151x154 hybrids and 153x154 also obtained the lowest score. Based on results in hybrid 31x32 beyond desired hybrids has higher yield potential and its use is recommended.
  Ehsan Hajian , Alireza Seidavi and Abolghasem Lavvaf
  An experiment was done in order to comparison of response to selection in three commercial pure lines of silkworm in spring and autumn seasons. Base population in each line consists of two selective and randomly groups. Selective group to each of the studied lines, superior 40 cocoon male and 40 cocoon female based on single cocoon weight after single recording of the three cocoon weight traits, cocoon shell weight and cocoon shell percentage of the population was selected 3P and another random mating were given. Random group (control) related to each of the studied lines, 40 male cocoon and 40 female cocoons randomly selected without any recording of the mentioned traits among 3P population had been gathered and crossed. In the first generation of the 40 produced larvae eggs categories in each group of each line, 8 categories with hatched percentage and suitable fertility for breeding were hatched. Thus each group consisted of 8 families in each line of brothers and sisters (with a parent). All the first generation, data files consist of 2400 records for each of three traits (800 records per line). Finally among the 8 families per group in each line 40 male cocoons and 40 female cocoons were crossed randomly to produce 40 larvae eggs categories of next generation. Breeding process and producing row data in second generation or 2p and third generation or p was done as the same as the first generation. All data files in all lines contain 7680 records from each of the three traits were studied (2560 records in each line). It should be noted that only selected population in all lines was done just in vase population and all crossing in nest generations were carried out randomly. According to information available to separate spring and fall seasons, the effects of data were separated and the response to selection separately for each season, were recorded and saved in the computer. Separation of effects in spring and fall seasons and compare responses to a choice of three lines of the above actions seaso effect showed that spring effects on three traits of 27 trait and autumn effect on four traits of these traits was significant statistically. Individual selection performance comparisons in base population of above three commercial lines based on cocoon weight and response to selected three lines for 27 traits examined in this study showed that spring effect on three traits of 27 studied traits is significant and the autumn on the four traits have significant effects. Spring effect on three traits in the pupae vitality percentage in middle cocoons, larvae duration and the un-hatched eggs number, the autumn on four traits was significant effects. Spring effect on three traits of pupae vitality percentage in middle cocoon, larvae duration and un-hatched eggs number was significant. Autumn effect on three traits of pupae vitality percentage in best cocoon, best cocoon percentage, middle cocoon percentage and un-hatched eggs number was significant.
  Reza Neshagaran Hemmatabadi , Alireza Seidavi and Shahaboddin Gharahveysi
  The records and responses to selection were analyzed in 4 generations of three pure and commercial lines of 31, 103 and 107 Iranian silkworm. In the beginning year of experiment, a parental group was selected, recorded and coded for each 3 lines of 31, 103 and 107 which had further weight average than the population average. These parents were crossed with each other and a selected group was made for these three lines. Also a parental group was chosen, recorded and coded for each of the three lines which include the weight average equal to population average weight. These parents also were crossed with each other and a coincidental group was made for these three lines. The members of each group were grown up and crossed during three successive generations coincidentally with out any re selection. The 27 average records were registered and analyzed. The data analysis in this research showed that among three studied lines in the whole year for larva vitality percentage, the highest response to selection is shown by line 103 (28.62%) then line 31 (70%) and their least line 107 (-3.90%) in the base population. The comparison of average response to these three lines selection also shows that the difference of response to the selection between lines is not significant statistically (p>0.05). Among lines in the whole year for larva remaining percentage, the highest response to selection was observed in line 31 (33.13 cocoon) followed by line 103 (17.91 cocoon) in the base population. Also, the least response to the selection in base population belonged to line 107 (9.29 cocoon). The comparison of average response to these lines selection showed that the response difference to selection in lines has not been significant statistically (p>0.05). Among the three studied lines in a whole year for a best cocoon total weight, the highest response to the selection in base population belonged to line 31 (49.44 g) then in line 103 (14.02 g) and the least response to selection in the base population belonged to line 107 (10.90 g). The comparison of average response to these three lines selection showed that there was not any statistical meaning in response difference to the selection among them (p>0.05). Among lines in the whole year for best single cocoons weight, the highest response to the selection in base population belonged to line 31 (0.05763 g) and then line 107 (0.05142 g) and the least response to selection belonged to the line 103 (0.014.7 g) in the base population. The comparison of average response to selection between three lines has shown that the response difference to the selection among lines is not significant statistically (p>0.05). Through lines in a whole year for the cocoon weight resulted form 10000 larva, the highest response to selection in the base population belonged to line 31 (601.1 g) then line 107 (572.9 g). The least response to the selection was observed in line 103 (-41.1 g). The comparison of average response to the selection through lines show that the response difference to the selection among these three lines is not significant statistically (p>0.05).
 
 
 
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