LINE x TESTER ANALYSIS. IN HYBRIDS BETWEEN POLYVOLTINE AND BIVOLTINE BREEDS OF THE SILKWORM, BOMBYXMORIL.

摘要

Genetic potentiality of four polyvoltine breeds developed through artificial parthenogenesis was evaluated with four bivoltine breeds in order to identify promising parents and hybrids by using Kempthorne (1957) model Among the parental lines, DNP_1 was found good general combiner exhibiting significant GCA effects for 7 characters. Among polyvoltine x bivoltine hybrids, DNP_4 x CSR_4 was found good specific combiner exhibiting significant SCA effects for 6 out of 12 characters. Two hybrids namely, DNP_2 x CSR_4 and DNP_4 x CSR_4 manifested significant hybrid vigour over better parent value for 7 characters. Majority of the hybrids showed their superiority particularly for characters such as yield/10,000 larvae by weight, cocoon weight, cocoon shellweight and filament length.