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| Evaluation of growth performance and nutrient composition of black soldier fly larvae treated with layinghen manure |
| Received:March 17, 2021 |
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| KeyWord:black soldier fly larvae;laying-hen manure;insect sand;growth performance;organic fertilizer |
| Author Name | Affiliation | E-mail | | CAI Yingfeng | College of Animal Science, South China Agricultural University, Guangzhou 510642, China | | | NIU Shihua | College of Animal Science, South China Agricultural University, Guangzhou 510642, China | | | LIU Shuo | College of Animal Science, South China Agricultural University, Guangzhou 510642, China | | | CHENG Zengwen | College of Animal Science, South China Agricultural University, Guangzhou 510642, China | | | LIAO Xindi | College of Animal Science, South China Agricultural University, Guangzhou 510642, China
Engineering Technology Research Center of Livestock and Poultry Waste Treatment and Resource Utilization of Guangdong Province, Guangzhou 510642, China
Key Laboratory of Chicken Genetics, Breeding and Reproduction, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China | | | XING Sicheng | College of Animal Science, South China Agricultural University, Guangzhou 510642, China
Engineering Technology Research Center of Livestock and Poultry Waste Treatment and Resource Utilization of Guangdong Province, Guangzhou 510642, China
Key Laboratory of Chicken Genetics, Breeding and Reproduction, Ministry of Agriculture and Rural Affairs, Guangzhou 510642, China | smileforsicheng@foxmail.com |
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| Abstract: |
| This study aims at investigating the effects of treatment by different proportions of laying-hen manure on the growth performance and insect sand fertilizer potential of black soldier fly larvae. In this study, fourteen groups of 3-day-old black soldier fly larvae with different densities were cultured in 150-day-old laying-hen manure in an artificial climate incubator. The study examined the growth performance and nutrient composition of black soldier fly larvae and the changes of nutrients in laying-hen manure. Results of the study showed that the growth performance of larvae in the T50 and T100 groups was significantly greater than that in other larva treatment groups (P<0.05). The fresh weight of larvae in the T50 and T100 groups reached 134.70 mg and 98.47 mg, respectively. The dry matter content in the two groups reached 37.49% and 34.61%, respectively. The moisture content of insect sand in T100 to T1000 groups was significantly less than that in the CK(fresh laying-hen manure), T0(insect-free), and the T50 groups(P<0.05). The pH of the insect sand was generally alkaline. The pH of the larva treatment group was higher than that of the CK group. The pH of only the larva treatment T100 group met the Organic Fertilizer(NY 525-2012). The crude protein content of insect sand in the larva treatment groups was significantly lower than that in the CK and T0 groups(P<0.05). The T350 group had the lowest crude protein content of insect sand(7.32%). The humic acid content of insect sand in the CK and T0 groups was greater than that in the T50~T1000 groups(P<0.05). The humic acid content in the CK group was significantly greater than that in the T50 and T100 groups. Meanwhile, the humic acid content of insect sand in the larva treatment groups T50 and T100 was greater than that in other larva treatment groups(P<0.05), which is nearly zero. All heavy metal concentrations in larva treatment groups T50 and T100 met the Organic Fertilizer. Further, the ratio of 100 black soldier fly larvae to 100 g of laying-hen manure met the requirements of larvae and insect sand. Black soldier fly larvae have higher levels of growth performance and nutrients with the treatment by laying-hen manure than without. With treatment, insect sand retains more humic acid, which is conducive to improving plant growth. Furthermore, with this treatment, pH, total nutrient content, and heavy metal concentrations meet the Organic Fertilizer in China. Results show that the larvae to manure ratio in the T100 group provides an efficient treatment of laying-hen manure by black soldier fly larvae, is conducive to the feeding and management of black soldier fly larvae, and can effectively turn poultry waste into a profitable product. |
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