2/ 2021
61
Agro Inform
REPRODUCTIVE AND VIABILITY CHARACTERISTICS OF
F1, F2 GENERATIONS DURING THE IMPROVEMENT OF
THE MULBERRY SILKWORM BREED BALANCED ON NON-
ALLELIC EMBRYONIC Z-LETHAL
UDC 635.632
Bakhtiyar Nasirillaev
doctor of agricultural sciences,
Murodkhuja Abdikodirov
Ph.D. student.
Annotation.
Reproductive and viability indicators, among the economic traits of the mulberry
silkworm, are important. This article reveals the results of research on the improvement of the unique
C-8 ngl breed of Bombyx Mori L. mulberry silkworm balanced on embryonic Z-lethal and sex-limited at
egg stage by transmitting high-tech traits of fine silk L-28 simple genetic line.
In particular, in the F
1
generation of mulberry silkworm, a reciprocal cross with a simple L-28 genetic
line
was performed. In the
F
2
generation, a complex combination in the form of ♀(С-8 ngl × L-28) × ♂(L-28 × С-8 ngl) was obtained.
In these studies, a comparative analysis of the parental components obtained in each generation, as well
as indicators of reproductive and embryonic viability in F
1,
F
2
generations were implemented. According
to the results of the analysis, despite the imbalance of embryonic lethal in F
1
generation compared to the
C-8 ngl breed taken as a control, a slight decrease in economic traits occurred due to separation. In the
F
2
generation, however, it was found that its level had risen to the level of parental components, even
higher. In the population of this genotype, it is possible to create an almost new breed by conducting
analytical selection from generation to generation.
Do'stlaringiz bilan baham: |