Utilization of heterosis in silkworm
2003
Bunnao, L.O. | Abuan, P.J. | Supsup, E.G. | Viduya, N.N. | Sanchez, L.M. | Balla, C.I. (Don Mariano Marcos Memorial State Univ., Batac, Ilocos Norte (Philippines). Sericulture Research and Development Inst.)
The combining ability of the newly developed bivoltine and multivoltine purelines and their hybrid combinations were evaluated. Seven newly developed bivoltine lines (DMMMSU 105, 108,109, 111, 113, 117, and 119) and four multivaltine lines (DMMMSU 1007, 1008, 1010, and 1012) were used. The combining ability tests revealed that the promising bivoltine parents were DMMMSU 108, 109, 111, 113, 117, and 119 based on single cocoon weight, cocoon shell percentage, cocoon yield box, and effective rearing rate. The promising bivoltine hybrid combinations were DMMMSU 105 x 113 and DMMMSU 105 x 111 for single cocoon weight, cocoon yield box, and effective rearing rate. Parent DMMMSU 1007 and 1008 were good combines for the production of heavy cocoons, high cocoon yield, and higher survival rate; DMMMSU 1010 and 1012 for high silk percentage. The promising Multivoltine F1 hybrids were the progenies of DMMMSU 1008 x 1012, DMMMSU 1010 x 1012, DMMMSU 1007 x 1008, DMMMSU 1008 x 1010, and their reciprocal crosses. The best multivoltine x bivoltine hybrid combinations were the progenies of DMMMSU 1012 x 119, DMMMSU 100 x 119, DMMMSU 1008 x 117, which gave higher cocoon shell percentage and cocoon yield box than the existing commercial hybrid DMMMSU 115 x 101. The best bivoltine x multivoltine hybrid combinations were DMMMSU 119 x 1008, DMMMSU 117 x 1008, and DMMMSU 117 x 1012, which gave higher cocoon shell percentage and cocoon yield box than the commercial hybrid, DMMMSU 222
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