The article discusses the results and methods of selection aimed at improving the biological characteristics in the rocks-components of high-yielding silkworm hybrids. High biological indicators of the breed components of the new hybrids guarantee high heterosis for many economically valuable features. Improving the viability of caterpillars and silkworm cocoons of component species can be achieved by conducting a systematic selection at all stages of development of the silkworm. Selection and breeding selection include the method of ranking breeds on the basis of productivity, the method of traditional selection, and the method of selection based on motor activity. The use of multiple selection methods in the complex leads to increased viability of the caterpillars, weight, and silkiness of caterpillars, weight, and silkiness of cocoons of MG, Ipakchi 2, Ya-120, Chinese 108 breeds.
The article explains that the silkworm is bred worldwide only as first-generation hybrids for maximum heterosis. The study supports the idea that the effect of heterosis will be significant if the breed components of the created hybrids have outstanding properties. Therefore, the selection of breeds with certain characteristics necessary for silkworm breeders in the future is very important. It is equally important that these characteristics are as high and stable as possible. For this, breeding work is carried out with component breeds aimed at improving certain characteristics. In this study, the selection is aimed at the reproductive properties of breeds. Selection and breeding work for three years has seriously changed some of the indicators of Gren. It has been demonstrated that targeted selection to improve the reproductive performance of breeds I-120, Chinese 108, MG, Ipakchi 2, leads to an increase in the number of normal eggs in the clutch and to a decrease in physiological marriage.
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