Evaluation of combining ability in hybrids between low, medium and high cocoon weight polyvoltine and bivoltine breeds of silkworm, Bombyx mori L. | Evaluation de l'aptitude à la combinaison chez les hybrides entre les lignées de vers à soie Bombyx mori L. polyvoltines et bivoltines à poids de cocon faible, moyen et élevé
2001
Ravindra Sing ((Central Sericultural Research and Training Institute, Mysore (Inde))) | Raghavendra Rao, D. | Premalatha, V. | Kariappa, B.K. | Jayaswal, K.P. | Datta, R.K.
General and specific combining abilities of low, medium and high cocoon weight polyvoltine and bivoltine breeds of Bombyx mori were evaluated by analysing ten quantitative characters. Six polyvoltine and three bivoltine breeds were used as lines and testers respectively. Evaluation of the performance of polyvoltine and bivoltine breeds for ten quantitative characters revealed that among the lines, PM and Nistari, possessing low cocoon weights, were found to be good general combiners for cocoon yield / 10,000 larvae both by number and weight whereas BL24 and BL43, possessing high cocoon weights, were found good general combiners for cocoon shell weight and cocoon shell ratio. Among the testers, CSR2, having a high cocoon weight, was found a good general combiner for cocoon weight and cocoon shell weight. The ratio of GCA:SCA in most of the economic characters were found more than 1 demonstrating predominant role of additive gene action. The hybrid BL24 x J2 exhibited significant positive SCA effects, for pupal weight, shell weight and floss /. Most of the hybrids revealed positive SCA effects for several quantitative characters
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