Correlation study of pupal size to egg fecundity and silk yield of silkworm (Bombyx mori Linn.)
1998
Kumar, V. | Singh, G.P. | Bhargava, S.K. (Central Sericulture Research and Training Inst., Mysore (India). Electron Microscopy Unit)
A comprehensive study on the correlation of pupal size to egg fecundity and silk yield of silkworm, Bombyx mori was made. The results revealed that most of the eggs were mature at the time of oviposition. The number of mature eggs was highly correlated with total number of eggs (r = 0.99). All the pupal dimensions, namely body weight, body length, body width, and wing length could be considered equally important parameters for correlation with total number of eggs and number of mature eggs. However, pupal weight was found to be the best one for estimating both number of mature eggs (r = 0.63) and total number of eggs (r = 0.62). Correlations of pupal weight were positive with shell weight (P less than 0.001), cocoon weight (P less than 0.001), filament length (p less tha 0.05) and total number of eggs (p less than 0.05). This indicates improvement in silk yield attributes and in the total number of eggs during pedigree selection in silkworm breeding programmes
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