Agro Inform reproductive and viability characteristics of

Table-3
Embryonic viability in C-8 ngl breed and the F
1
generation obtained in the improvement of C-8 
ngl breed 
Breeds and hybrids
Number of 
returns (n), pcs
Sex ratio, 
%
Egg hatching, 
%
Relatively on 
control, %
С-8 ngl (control)
3
50♀:50♂
89,3±1,45
100
L-28 (improver)
3
50♀:50♂
93,0±1,52
104,1
♀L-28×♂С-8 ngl F
1
3
100♂
94,6±1,1
105,9
♀С-8 ngl×♂L-28 F
1
3
50♀:50♂
94,6±2,4
105,9
From the table above, it can be seen that the egg hatching in the F
1
generation obtained by 
reciprocal crossbreeding of the C-8 ngl breed balanced on embryonic lethal with L-28 line on was at the 
level of the parental breeds. In particular, in the combinations ♀L-28 × ♂C-8 ngl and ♀C-8 ngl × ♂L-28 the 
same indicator – 94.6% was observed, 105.9% compared to the control breed C-8 ngl (reliability of the 
difference Pd = 0.907-0.999).
We can see that in the F
1
generation obtained by this reciprocal crossbreeding, there is a growing 
trend in egg hatching relative to the parent breeds.
According to the improvement scheme of the obtained F
1
generation, a crossbreeding in the form 

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Agro Inform 
2/ 2021
66
♀ (C-8 ngl × L-28) × ♂ (L-28 × C-8 ngl) was performed to obtain the F
2
generation. 
In the spring worm rearing season of 2021, the embryonic viability was determined in the F
2
generation obtained in the C-8 ngl balanced on embryonic lethal and in the improvement of C-8 ngl (Table 
4).
Table-4 
Embryonic viability in C-8 ngl and the F
2 
generation obtained during the improvement of C-8 ngl breed