Author(s):

Manu HN, Prashanth J, Chaitra S and Jagadeeshkumar TS

Abstract: In the present investigation an attempt has been made to study the various parameters of consumption indices in relation to the different concentration of cholesterol supplementation during 4^th instar silkworm of FC₁XFC₂ and FC₄XFC₃ hybrids. The food consumption comprises the ingesta and digesta during 4^th instar showed the level of ingesta was significantly higher compare to digesta in all the cholesterol treated batches in all 4 days, but on 4^th day the rate of food consumption represents the highest rate of ingesta in the selected hybrids. Similarly the approximate digestibility was maintained ranging from 50-85% in cholesterol treated batches, whereas the efficiency of conversion of food ingested and efficiency of conversion of food digested were low ranging from 5-38% in FC₁XFC₂ and FC₄XFC₃ silkworm hybrids. The consumption index and coefficient of metabolism are the two nutritional parameters indicates the maximum attainment ranging from 0.8-0.9 ratio in all the days in all the cholesterol treatment concentration, whereas the growth rate was constantly maintained during 4^th instar ranging from 0-0.05 throughout the instar in FC₁XFC₂ and FC₄XFC₃ hybrids. The pattern of changes in the ingesta and digesta of 5^th instar silkworm, but cholesterol supplemented during 4^th instar extended the above parameters ranging from 9-14g from first day to day seventh, whereas the digesta falls within a range of 9g during 5^th instar in both the hybrids. The efficiency of conversion of food ingested, efficiency of conversion of food digested and approximate digestibility of 5^th instar silkworm hybrids treated with three doses of cholesterol during 4^th instar a showed the magnitude of changes above the level of 50% in FC₄XFC₃ hybrid, but the FC₁XFC₂ represents less than level of 50% except 5^th day and 7^th day during 5^th instar. The consumption index, growth rate and co-efficient of metabolism were calculated during 5^th instar the ratio was ranging from 0-1 in all the three parameters except consumption index and co-efficient of metabolism on 7^th day ranging from 6-7 and 2-3 on respectively on the last day of 5^th instar in FC₁XFC₂ and FC₄XFC₃ hybrids.

DOI: 10.22271/phyto.2020.v9.i3Sc.11874

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