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Trends in Applied Sciences Research
  Year: 2011 | Volume: 6 | Issue: 1 | Page No.: 81-88
DOI: 10.3923/tasr.2011.81.88
 
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Impact of Trait Selection in Optimizing the Egg and Silk Yields of Daba Ecorace of Tropical Tasar Silkworm, Antheraea mylitta Drury for Seed and Commercial Crop Seasons

R. Manohar Reddy

Abstract:
Vanya silk production in Daba ecorace of Antheraea mylitta Drury (Lepidoptera: Saturniidae) often ends up with tentative yields and the present study aimed to optimize its seed (egg) and silk productivity through varied parental combine based on their commercial traits for optimal sustenance. The prospects of varied parental combinations were assessed through consecutive rearing seasons (RS1 = July/Aug, 06; RS2 = Sept/Dec, 06; RS3 = July/Aug, 07; RS4 = Sept/ Dec, 07; RS5 = July/Aug, 08) to optimize the commercial trait output. The high pupal weight female and high shell weight male combination (C4) has recorded gain in fecundity (+8.6%), shell weight (+22.2%), silk ratio (+13.9%) and silk yield (+12.1%) with minor reduction in egg hatching (-2.4%) and cocoon yield (-6.6%) over the randomly mated parental combination (control-C1), when data of five successive rearing seasons were pooled. The high shell weight parental combination (C3) has recorded higher gain in shell weight (+12.7%) and silk ratio (+9.8%), marginal progression in fecundity (+1.2%) and regression in egg hatching (-7.8%), cocoon yield (-24.1%) and silk yield (-17.8%) when compared to control. The high pupal weight parental combination (C2) has exhibited maximum gain in fecundity (+12.2%) and loss in hatching (-19.6%), cocoon yield (-35.5%), shell weight (-12.7%), silk ratio (-10.6%) and silk yields (-45.4%) in comparison to control. The parental combinations have expressed dissimilar performance in individual rearing seasons and average of five successive seasons, though they originated from same parental stock. The study suggested that same ecorace can have different parental combinations based on magnitude of commercial traits with associated crop rearing seasons and these can be utilized for evolving breeds of commercial worth with higher fecundity and shell weight to supplement the commercially important vanya silk yield.
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How to cite this article:

R. Manohar Reddy , 2011. Impact of Trait Selection in Optimizing the Egg and Silk Yields of Daba Ecorace of Tropical Tasar Silkworm, Antheraea mylitta Drury for Seed and Commercial Crop Seasons. Trends in Applied Sciences Research, 6: 81-88.

DOI: 10.3923/tasr.2011.81.88

URL: https://scialert.net/abstract/?doi=tasr.2011.81.88

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