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Molaei M.,Islamic Azad University | Mavvajpour M.,Iran Silkworm Research Center | Merat A.,Iran Silkworm Research Center | Seidavi A.,Islamic Azad University at Rasht
Life Science Journal | Year: 2011

The purpose of this experiment was to investigation on different delay times in starting of feeding in different instars, and their effects on the performance and uniformity of silkworm larvae. Silkworm egg production stages, egg washing, disinfecting, maintenance of silkworm eggs, microscopic tests in order to removing of contaminated samples against pebrin pathogen, first to fifth larval instars rearing, cocoon production framework and cocoon recording was conducted based on standard guidelines. Ten dietary management programs were used as ten treatments. Performance records analyzed using generalized linear models procedure. All the measured indices was compared between different treatments based completely randomized design model. From obtained results, it has showed that among studied methods, the highest level of best cocoon number belonged to 5th treatment (80.75), and 3rd treatment (44.70) remained at lower level than other methods (P>0.05). The highest level of best cocoon weight belonged to 5th treatment (80.75 gr), and 3rd treatment (44.70 gr) remained at lower level than other methods (P>0.05). The highest level of larva weight (5th day of 5th instar) belonged to 3rd treatment (3.48 days), and 9th treatment (3.24 days) remained at lower level than other methods (P<0.05). Among studied methods, the highest level of female cocoon weight belonged to 1st treatment (2.13 gr), and 2nd treatment (1.90 gr) remained at lower level than other methods (P<0.05). The highest female cocoon shell weight belonged to 1st treatment (0.42 gr), and 2nd treatment (0.36 gr) remained at lower level than other methods (P<0.05). Among studied methods, the highest level of female cocoon shell percentage belonged to 9th treatment (24.18%), and 2nd treatment (18.94%) remained at lower level than other methods (P>0.05). The highest level of male cocoon weight belonged to 6th treatment (1.69 gr), and 2nd treatment (1.56 gr) remained at lower level than other methods (P<0.05). Source


Mirhosseini S.Z.,Guilan University | Nematollahian S.,Iran Silkworm Research Center | Ghanipoor M.,Iran Silkworm Research Center | Seidavi A.,Islamic Azad University at Rasht
Biological Research | Year: 2010

Five Iranian native silkworm groups: Baghdad, Khorasan Orange, Guilan Orange, Khorasan Pink, Khorasan Lemon, and 107 and 110 commercial lines (12 families from each breed) were randomly selected and reared during 2003-2005 (five generations in spring and autumn). In each family, 30 male and 30 female cocoons were individually recorded for weight, shell weight and shell ratio. From among the native groups, the highest average in all three traits belonged to Baghdad and Khorasan Pink, and the lowest to Khorasan Orange and Khorasan Lemon. From among the commercial lines, the highest average in all three traits belonged to 107. In comparing heritability for cocoon weight in native groups, the highest heritability belonged to Guilan Orange (0.5147) and Khorasan Orange (0.5036) and the lowest heritability belonged to Khorasan Pink (0.0967). In the two other traits, the highest heritability belonged to Khorasan Orange and Baghdad and the lowest to Khorasan Pink. In the commercial lines, line110 had higher heritability than line107 for cocoon weight and cocoon shell weight. In all the groups, genetic correlations between cocoon weight and cocoon shell weight were high, expect for the Baghdad group. There was medium or low genetic correlation among cocoon weight, cocoon shell weight and cocoon shell ratio. Source


Salehi Nezhad M.,Islamic Azad University | Mirhosseini S.Z.,Guilan University | Gharahveysi S.,Islamic Azad University | Mavvajpour M.,Iran Silkworm Research Center | Seidavi A.R.,Islamic Azad University at Rasht
Journal of Food, Agriculture and Environment | Year: 2010

The present study was undertaken to ascertain the magnitude of genetic diversity among all 51 silkworm genotypes and estimate the genetic variation for economical traits to augment the utilization of silkworm genetic resources for silkworm breeding programs. Various methods generated similar dendrograms. The dendrograms obtained from hierarchical cluster analysis of Iranian silkworm strains based on studied traits were presented. However, the strains of the same origin did not group together, demonstrating they can have different biological and development performance. The first and second groups divided into three sub-groups separately. Three sub-groups of the first group included 8, 15 and 1 strains, respectively. Other strains were grouped together and far from other silkworm strains, indicating they might be suitable for future crossings, maintenance of parental strains, and hybridizations with oval cocoon strains so as to maximize heterosis and to avoid depression inbreeding. Source


Salehi Nezhad M.,Islamic Azad University | Mirhosseini S.Z.,Guilan University | Gharahveysi S.,Islamic Azad University | Mawajpour M.,Iran Silkworm Research Center | Seidavi A.R.,Islamic Azad University at Rasht
Journal of Food, Agriculture and Environment | Year: 2010

This experiment was conducted in order to comparison of all 51 peanut cocoon silkworm strains of Islamic Republic of Iran in gene bank and selection and introduction of the best lines available for next breeding programs. Fifty-one silkworm strains were used in the present study. The batches of 250 silkworm larvae were reared. Based on reproductive characters strains were assessed on different parameters including hatchability percentage, number of laid eggs, number of fertilized eggs, number of unfertilized eggs, and number of unhatched eggs using the evaluation index and sub-ordinate function methods. The hatchability percentage of the 105 (98.400%), M2-6-22-2 (98.400%), B2-09 (97.733%), 101433-1-4 (97.500%) and T5-M (97.400%) strains remained significantly at upper level than that of other strains, respectively. Totally, M2-6-22-2 (330.591), T5-M (329.463), 105 (316.794), 101433-1-4 (299.172) and 1126[111] (297.447) showed higher evaluation index values. Also, 1524(3.375), M-1-2[5] (3.112), 151 [103×M1-1] (3.083), M2-6-22[ 107] (2.919) and N19 (2.763) showed higher sub-ordinate function values. Source


Nezhad M.S.,Islamic Azad University | Mirhosseini S.Z.,Guilan University | Gharahveysi S.,Islamic Azad University | Mavvajpour M.,Iran Silkworm Research Center | Seidavi A.R.,Islamic Azad University at Rasht
Asian Journal of Animal and Veterinary Advances | Year: 2010

The present study aims at shedding more light to larval duration and development of silkworm lines from Iranian silkworm gene bank and comparison of the results using statistical models for selection of the superior strains. Feeding and other conditions of larval rearing were conducted following the standard procedure and all germplasm strains were reared under standards protocols in all rearing steps. From obtained results, it is showed that the larval duration of the 101 (608.000 h), 5118x10133-3-3 (588.670 h), 307-300-2 (584.000 h), 105 (584.000 h) and 31 (584.000 h) strains remained significantly at upper level than other strains, respectively. The feeding larval duration in B2-09 (574.000 h), N19 (533.000 h), 1433-9 (525.000 h), BH-2 (517.330 h) and 1433-15 (511.330 h) strains increased significantly in comparison with other strains. Molting larval duration remained significantly at upper level in I 20 (197.670 h), 107-K (113.000 h), Black Larvae-White Cocoon (104.000 h), 101(104.000 h) and Shaki (103.000 h) increased significantly in comparison with other strains. From obtained results, it is showed the 1-3 instars larval duration of the Black-White (292.670 h), 101 (290.000 h), 1003-5 (288.670 h), 101xF6 (286.000 h) and 31 (286.000 h) strains remained significantly at upper level than other strains, respectively. Totally, 7409 (577.881), Black Larvae-White Cocoon (577.508), 236 (570.769), M-1-2(5) (568.583) and T5-M (566.602) showed higher evaluation index values. Also, 7409 (5.374), 236 (5.267), T5-M (5.183), 113-K (5.163) and White Larvae-Yellow Cocoon (5.027) showed higher sub-ordinate function values. © 2010 Academic Journals Inc. Source

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