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Fecundity response in relation to rearing temperature in silkworm Bombyx mori L.

Muniraju, B. M. Sekharappa & R. Raghuraman
Karnataka State Sericulture Research and Development Institute
Thalaghattapura, Bangalore, 560062, India

Received 12th Dec. 2006; Revised 7th Feb. 2007

Abstract: Rearing temperature influences cocoon production and fecundity in silkworm Bombyx mori L. Yong age (I to III instar) worms of pure Mysore a multivoltine and NB4D2  bivoltine were reared at 26, 28, 30, and 32°C followed by selected combinations of these temperatures during late age (IV and V instar). Survival and fecundity decreases with the increase in rearing temperature in both the races. However, the pure Mysore has a better performance overNB4D2 indicative of better adoptability. Temperatures upto 28 °C for chawki rearing followed by lower temperature of 26 °C during later age are favorable for better fecundity over other temperature levels in both the races selected. Temperature beyond 28 °C during chawki is not favourable for better recovery irrespective of temperature provided during late age in respect of both the races.

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