Nutritional analysis of alternative feed ingredients and theireffects on the larval growth of Tenebrio molitor (Coleoptera:Tenebrionidae)
2017
KIM, S.Y., National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Kim, H.G., Gachon University, Seongnam, Republic of Korea | Yoon, H.J., National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Lee, K.Y., National Institute of Agricultural Science, RDA, Wanju, Republic of Korea | Kim, N.J., Gachon University, Seongnam, Republic of Korea
Alternative feeds comprising only brewer's spent grain (BSG) or distillers dried grain(DDG), both agricultural byproducts, and 50% BSG or 50% DDG mixed with 50%wheat bran (WB) were compared to the standard 100% WB feed provided toTenebrio molitor larvae to evaluate their effects on the nutritional quality andeconomic viability of mass?producing this insect. Crude protein content was highestin larvae fed on 100% WB and 100% DDG, and the latter had 2.32 and 1.88 timesmore essential and non essential amino acids than the 100% WB group, respectively.Larvae fed on 50% DDG + 50% WB had 1.30 times more saturated fatty acids but1.08 times less unsaturated fatty acids and 1.03 - 1.23 times less potassium,phosphorus, and magnesium than larvae fed on 100% WB. Traces of mercury weredetected in larvae fed on 100% WB and 50% DDG + 50% WB, although at levelsbelow the General Food and Feed Standard (Ministry of Food and Drug Safety,Republic of Korea), but neither Escherichia coli or Salmonella spp. were detectedin the feeds. Larval and pupal weight, larval development and survival, and pupationrate were higher in larvae fed on 50% BSG or 50% DDG mixed with 50% WBgroups than in larvae fed on 100% WB. Therefore, using 50% BSG or 50% DDGmixed with 50% WB as an alternative feed in the mass production of T. molitorprovides higher quality larvae at a lower cost than does using the conventional100% WB feed.
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