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Articles by A.A.A. Qotbi
Total Records ( 1 ) for A.A.A. Qotbi
  A.R. Seidavi , A.R. Bizhannia , M. Ghanipoor and A.A.A. Qotbi
  Aim of this research was investigation on improvement possibility of resistance, production and reproduction traits in 3P, 2P and P generations in three Japanese pure lines of silkworm Bombyx mori L., using individual selection in 3P generation parent`s level. At silk cocoon production process and silkworm breeding programs, reproduction traits supplies silkworm egg producers, cocoon quantitative and resistance traits supplies farmers` benefits. Hence it must be noticed to these traits together. Furthermore, selection systems applied in 3P pure line levels. Reproduction, production and resistance characters have negative correlations probably in some varieties. Therefore, an experiment must be designed to investigation on effect of parent`s selection on the basis of cocoon weight on reproduction and resistance characters in 3P, 2P and P generations. At each pure line including 31, 103 and 107, it is recorded male and female cocoon weight and then 16 sire and dam parents were selected accordingly the most weight at each line. Furthermore, 16 sire and dam parents were selected by chance and without any selection at each line. These three pure lines were reared in 3P, 2P and P generations and investigated and compared their resistance, production and reproduction traits separately. From obtained results, it was showed that phenotypic trend for cocoon weight is positive and significant (p<0.01). It is showed that parental selection on the basis of single cocoon weight in 3P generation, had not decrease reproduction and resistance characters at next generations of 3P, 2P and P significantly (p<0.01). Hatchability, defected eggs percentage and pupae vitality were not declined significantly in three studied pure lines (p<0.01). These results could due non-negative correlations between these traits in three studied pure lines. From obtained results, parents would be selected on the basis of cocoon weight parameters in 3P generation. Also it is recommended that economical coefficients and genetical parameters are noticed for reproductive, resistance and quantitative cocoon characters together.
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