Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, DK-9220 Aalborg, Denmark.
Department of Chemistry and Bioscience, Aalborg University, Fredrik Bajers Vej 7H, DK-9220 Aalborg, Denmark.
Waste Manag. 2021 Feb 15;121:198-205. doi: 10.1016/j.wasman.2020.12.009. Epub 2020 Dec 25.
We have measured growth and respiration in black soldier fly (BSF) larvae fed with mixtures of a low-quality substrate (degassed sludge, DS), and a high-quality substrate (chicken feed, CF) in order to elucidate how substrate quality affect larval metabolism and feed conversion into new biomass. The BSF larvae grew faster and became larger the higher the content of CF was in the substrate. Growth followed a sigmoidal curve from where the specific growth rate was determined and compared to measured specific respiration rates, in order to estimate costs of growth, maintenance metabolism, rates of feed assimilation, and net growth efficiency. Specific feed assimilation rates were similar on all substrate mixtures. Maximal specific growth rates were also affected only little unless the larvae were grown in pure DS. In contrast, the cost of growth and the maintenance metabolism were larger the higher the proportion of DS was. High specific growth rates were, in addition, sustained for shorter periods of the time the more DS was included in the substrate mixtures. In effect, higher proportions of the assimilated feed were spent on respiratory purposes instead of being converted into larval biomass and the net growth efficiency decreased the more DS was included in the substrate mixtures. We conclude that substrate quality may affect the conversion of feed into new biomass via alterations of the metabolic performance of BSF larvae and thereby the overall performance of BSF larval cultures.
我们已经测量了以低质量基质（脱气污泥，DS）和高质量基质（鸡饲料，CF）混合物喂养的黑水虻（BSF）幼虫的生长和呼吸情况，以阐明基质质量如何影响幼虫代谢和将饲料转化为新生物质的效率。BSF 幼虫在基质中 CF 含量越高，生长速度越快，体型越大。生长遵循一个 S 形曲线，从中可以确定特定生长率，并与测量的特定呼吸率进行比较，以估计生长成本、维持代谢、饲料同化率和净生长效率。在所有基质混合物上，特定的饲料同化率相似。除非幼虫在纯 DS 中生长，否则最大特定生长率也只会受到很小的影响。相比之下，生长成本和维持代谢的比例越高，就越大。此外，DS 在基质混合物中所占的比例越高，高特定生长率持续的时间就越短。实际上，更多被同化的饲料被用于呼吸目的，而不是转化为幼虫生物质，并且随着 DS 在基质混合物中所占比例的增加，净生长效率会降低。我们得出结论，基质质量可能会通过改变 BSF 幼虫的代谢性能来影响饲料向新生物质的转化，从而影响 BSF 幼虫培养的整体性能。
