Indian Society of Genetics & Plant Breeding
Studies on variability estimates, heritability, correlation and path analysis in 56
multivoltine silkworm breeds (Bambyx mario L.) consisting of 46 indigenous and 10
exotics were carried out for cocoon shape, size and weight variables. Wide range of
variability for all the characters was observed and the variability was normally
distributed except for cocoon volume where it was positively skewed. High heritability
coupled with high genetic advance as percentage of mean was observed for cocoon
volume and area, rest of the traits exhibited high heritability associated with moderate
genetic advance. All the correlations were in positive direction. Cocoon volume and
area were significantly associated with other characters. Cocoon width was significantly
correlated with cocoon weight and shell weight. Path analysis studies revealed the
importance of selection pressure on cocoon width, cocoon volume and shell weight
in breeding programme aimed at improving the cocoon weight.
Keywords: Silkworm, variability, cocoon shape, cocoon size, correlation, path analysis
Year: 2000
Volume: 60
Issue: 4
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906
S. MUKHERJEE, P. MUKHERJEE, N. DHAHIRA BEEVI AND R. K. SINHA info_circle
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