Authors : Agbogunleri, B.; Deekae, S.N.; Ngah, S.A.; Otene, B. B.; Ogan, H. I.

Volume/Issue : Volume 8 - 2023, Issue 12 - December

Google Scholar : http://tinyurl.com/bdd66r3d

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DOI : https://doi.org/10.5281/zenodo.10939973

Abstract : This study used one control group i.e. BSFL fed with spent grain from the hatching to prepupa stage while the experimental group were BSFL fed with pig manure only, chicken manure only, fruit wastes only with other combinations. The objectives of this study were to establish a small pilot facility for testing the various organic wastes streams at a farm level, determine the waste reduction efficiency from different wastes streams tested at the farm with spoilt fruit sourced from fruit market, determine efficiency of digestion of wastes by BSFL. The results revealed larvae grown on spent grain (SG) grew from 80mg on day4 to 118mg on day7 and by day13 it achieved a weight of 225mg. The larvae raised on pig manure (PM1) grew from 82mg on day4 to 124mg on day7 and to 243mg on day13.Those raised on (CM1) grew from 77mg on day4 to 249mg on day13. Those raised on FV1 grew from 75mg on day4 to 268mg on day16, while those raised on PM2 grew from 82mg on day4 to 262mg on day16. The larvae raised on CM2 grew from 77mg on day4 to 249mg on day16 and those raised on FV2 grew from 78mg to 251mg on day16. Bioconversion rate (BCR) of BSFL fed with SG recorded was 3.65, PM1 was 4.02, CM1 4.47, FV1 was 4.36 while PM2 was 4.31. The CM2 was 4.44 while FV2 was 4.09. Feed conversion rate (FCR) for BSFL fed with SG recorded was 22.37, PM1 was 24.85, CM1 22.36, FV1 was 22.92 and PM2 was 23.22. The FCR for CM2 was 22.51 while FV2 was 24.47. The best- fit equation for SG showed an exponential growth with R 2 equal to 0.9971. For PM1, the best-fit equation showed an exponential growth with R2 equal to 0.9971 while the best fit equation for CM1 showed an exponential growth with R2 equal to 0.9954. For FV1, growth rate had the best-line of fit as polynomial with R2 equal 0.9724 while for PM2, growth rate had the best- line of fit as linear function with R2 equal 0.9785. For CM2, this growth rate revealed a polynomial function with R2 equal to 0.9661 while FV2 revealed best-line of fit as polynomial with R2 equal 0.981. Waste reduction rate (WR) ranged from 55.2% to 62.58%. Results showed BSFL grown on SG had performed better (62.58%) followed by PM1 (59.6%) and CM1 (58.8%). The waste reduction index (WRI) revealed BSFL fed with SG recorded better waste reduction index (4.81) followed by PM1 (4.58) and CM1 (4.52). The WRI from CM2 was (3.45).Further studies on the quality of the BSFL raised with these agricultural wastes and the safety is required to enable NESREA consider BSFL as an option for managing organic wastes in Nigeria.