Artificial diets determine fatty acid composition in edible Ruspolia differens (Orthoptera: Tettigoniidae)
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Date
2018
Authors
Rutaro, Karlmax
Malinga, Geoffrey M.
Opoke, Robert
Lehtovaara, Vilma J.
Omujal, Francis
Nyeko, Philip
Roininen, Heikki
Valtonen, Anu
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Asia-Pacific Entomology
Abstract
There are increasing interests in rearing edible insects in Africa, but information on how the feeds modify their fatty acids is largely
lacking. In this work, the influence of artificial diets on the fatty acid contents and composition in the edible Ruspolia differens
(Serville, 1838), in Uganda was assessed. R. differens was reared on the mixtures of six gradually diversified diets of two, three, four,
six, eight and nine feeds. The diets were formulated from rice seed head, finger millet seed head, wheat bran, superfeed chicken egg
booster, sorghum seed head, germinated finger millet, simsim cake, crushed dog biscuit pellet and shea butter. Fatty acid methyl esters
were prepared using direct transesterification method, and analysed using gas chromatography. The contents of saturated,
monounsaturated and polyunsaturated fatty acid differed significantly among the diets. The more diverse diets resulted in increased
content of the polyunsaturated fatty acids. The n6:n3 ratio differed significantly among the diets and between the sexes, with R.
differens fed on the four-feed diet having a higher n6:n3 ratio than those fed on other diets. Also, the fatty acid composition differed
significantly among the diets, and diet diversification corresponded with the proportions of polyunsaturated fatty acids, especially
linoleic acid. Overall, our results demonstrate that higher levels of essential fatty acids can be achieved by rearing R. differens on
highly diversified diets. These findings are important in informing the design of future mass-rearing program for this edible insect
Description
Keywords
Diet, Edible insects, Edible grasshopper, Essential fatty acids, Fatty acid content, Nutritional composition
Citation
Karlmax Rutaro, Geoffrey M. Malinga, Robert Opoke, Vilma J. Lehtovaara, Francis Omujal, Philip Nyeko, Heikki Roininen, Anu Valtonen , Artificial diets determine fatty acid composition in edible Ruspolia differens (Orthoptera: Tettigoniidae). Aspen (2018), doi:10.1016/j.aspen.2018.10.011