Characterization of Some Breeds and Hybrids of Bombyx mori L. Silkworms through Biological Index of Spawning

The main aim of this study is to determine the parameters of biological indexes of Bombyx mori L. spawning, in order to obtain adequate larvae for experimental breeding using MSF (Familial Sericulture Modulus). The biological material used for experiments contains the pure breeds AB (Alb Băneasa), B1 (Băneasa 1), AC (Alb de Cislău), AC29 (Alb chinezesc, line 29), AC29/T (Alb Chinezesc), AC/T (Alb de Cislău), RG90, IBV, S8, AJ5/F, C127, AJ17, C108/T, AO/T and the hybrids B1XAC, ACXB1, ABXAC29, AC29XAB, ACXAB, ABXAC, ABXB1, B1XAB. For each pure breed and hybrid were determinate the number of eggs/spawning, the number of hatching eggs, the hatching percent (%) and the number of unhatching eggs. The analyse of these indexes was done in three consecutive years, and the averages and spread parameters, as well as variability coefficients (V%) were calculated for each breed and hybrid. The obtained values of biological indexes of spawning were compared with those reported in autochthon and foreigner literature. The main conclusions of our study are that the autochthon breeds and hybrids values are according to the values published by other researchers and correspond for the experimental breeding