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Asian Journal of Animal and Veterinary Advances
Year: 2009  |  Volume: 4  |  Issue: 3  |  Page No.: 104 - 113

Determination and Comparison of Nutritional Indices in Commercial Silkworm Hybrids during Various Instars

Alireza Seidavi    

Abstract: The aim of the present study was generate data on Bombyx mori feeding and nutritional indices and characteristics during 1st-5th larval instars and comparison of these parameters among eight commercial hybrids. All insect rearing and experiments were done under special laboratory conditions. The several parameters such as quantity of food consumed, fecal matter excreted and larval growth was determined based on fresh (wet) and dry weight. The experiment was set in a completely randomized design. Also, evaluation index value and sub-ordinate function value were calculated for nutritional indices. From obtained results, gain for total instars (1-5 instars) was maximal in 104x103 (0.67 g DM/larva) and minimum in 151x154 (0.56 g DM/larva). In all the hybrids, ingested food for total larval duration was observed to be above 5.8 g DM/larva. Highest food consumption was recorded in 31x32 (6.31 g DM/larva) followed by 32x31 (6.30 g DM/larva) and 104x103 (6.22 g DM/larva), whereas lowest was recorded in 151x154 (5.80 g DM/larva) followed by 154x151 (5.82 g DM/larva). ECI for total instars (1-5 instars) was maximal in 151x154 (10.35) and minimum in 153x154 (8.37). In all larval duration, approximate digestibility was observed to be above 0.47. Highest AD was recorded in 154x151 (0.507) followed by 153x154 (0.505) and 31x32 (0.504), whereas lowest was recorded in 104x103 (0.475) followed by 103x104 (0.476). After evaluation by both the statistical methods (evaluation index method and sub-ordinate function method), hybrids of 31x32, 104x103 and 32x31 were identified as potential hybrids for further development at distribution between farmers.

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