A B S T R A C T Heterosis and combining ability studies of the isolated variable multivoltine races and developed bivoltine races with high yield capacity and their eighteen combinations were evaluated in two commercial rearing seasons in Bangladesh. Appropriate statistical methods were employed to interpret data on the hybrid performance, general and specific combining ability of the hybrids. Analysis of variance for combining ability revealed larger mean squares. Here high δ 2 gca /δ 2 sca values for most of the characters reflected predominant additive gene action. Similarly, the variance of components of specific combining ability (δ 2 sca ) of multivoltine×bivoltine were higher than those of general combining ability (δ 2 gca ) for most of the characters in both the seasons indicating preponderance of non-additive gene action inheritance of all these traits. Among the combinations BSR-BN(B 1 )×BSRB-BB 1 and BSR-3×BSRB-BB 2 exhibited highly productive performance which could be recommended for commercial cocoon production in Bangladesh.
MATERIALS AND METHODS
Materials:A line×tester crossing design was followed where 6 lines of multivoltine (BSR-BN(M)-P 1 , BSR-BN(B 1 )-P 2 , BSR-BN(P)-P 3 , BSR-IDC-P 4 , BSR-3-P 5 , BSR-10-P 6 and 3 testers of bivoltine (BSRB-BB 1 -P 7 , BSRB-BB 2 -P 8 and BSRB-03(sl)-P 9 ) silkworm B. mori L. were utilized for the experiment.Methods: A total of 27 hybrid combinations and parents were developed through line×tester analysis technique (Kempthorne, 1957). The experiment was conducted in three replications in the two very important commercial rearing 92 www.ansinet.com | Volume 15 | Issue 2 | 2015 |
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.