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20211
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Subject: Livestock Production and Management × Author: DEEPAK MATHEW D K × End date: 2021 × Start date: 2021 ×
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    ThesisItemOpen Access
    NUTRIENT RECYCLING POTENTIAL OF FLY LARVAE FOR BIOWASTE MANAGEMENT
    (COLLEGE OF VETERINARY AND ANIMAL SCIENCES MANNUTHY, THRISSUR, 2021-10-18) DEEPAK MATHEW D K; A. Kannan
    The fly larva plays a pivotal role in nutrient recycling of biowastes. This study was to find the nutrient recycling efficiency of fly larvae in biowastes, and to assess the nutrient content of fly larva and economic viability of bioconversion. The flies that colonized biowaste were identified in the pilot study. The five different biowastes viz. cow dung (BW-I), pig manure (BW-II), poultry manure (BW-III), poultry slaughter waste (BW-IV) and food waste (BW-V) were subject for the study. The climatic parameters, fly and larval activity, physicochemical parameters and proximate principles of substrate and leachate were recorded in the three different seasons viz summer (S-I), monsoon (S-II) and post monsoon (S-III). The biomass yields from the biowastes were also recorded. The results showed that primary colonizers, Chrysomya sp. were significant in poultry slaughter waste while Black soldier fly (BSF) was significantly found in food waste. During the study period, the climatic variables, temperature (oC), relative humidity (per cent) and rainfall ranged from 28 to 30oC, 75 to 84 per cent and 15 to 359 mm respectively. Significant (p< 0.05) reduction in weight (kg) was observed in BW-IV with a final weight of 1.97 kg. Significantly high temperature ( oC ) of 40.28oC was observed in middle layer of BW-V in phase-I of S-I. Significantly low pH was recorded in BW-V (3.5), and significantly high pH was observed in BV-III (7.96). Carbon dioxide emission was significantly higher in BW-V (49.9 per cent), while ammonia and hydrogen sulphide were significantly higher in BW-IV which were 100 and 347.63 ppm respectively. The highest significant larval biomass yield of 33.42 g (BSF) was from BW-V during S-I which was significant with other substrates. The crude protein (CP) of Chrysomya larva, ranged between 49 to 51 per cent while for BSF larvae it was 36 to 38 per cent. Highest significant BOD of 36.73 g/l and COD of 52.57 g/l were recorded from BW-IV. The reduction in weight of biowaste on dry matter basis was highest for BW-V in S-I (59.8 per cent) while it was below one per cent for BW-I, II and III. The highest total biomass yield of 445.16 g BSF larvae was obtained from BW-V in S-I. The BW-IV gave an yield of only 11.6 g larva during the S-I. The economic analysis revealed that production cost of one unit of CP with BSF larva was Rs. 0.30 to 0.45 which was lower than that of soyabean (Rs 1.00). This study concluded that nutrient recycling using BSF larva in food waste (BW-V) was economically viable.