The demand for alternative protein sources by the livestock industry has increased substantially.
Therefore, insects are being promoted as a novel nutrient source in animal feed. As detailed
in this review, eleven patents related to feeding insects to terrestrial animals including livestock
and companion animals have been commercially applied. Six and eight of the patents have
been used to produce poultry and fish, and crustacean feed, respectively. The most promising species
for industrial feed production was the black soldier fly (Hermetia illucens), the mealworm
(Tenebrio molitor), and the two-spotted cricket (Gryllus bimaculatus). Regarding research areas of
the patents reviewed here, studies on the composition and optimal mixing ratio of feeds and on insect
rearing, harvesting, and post-harvest technologies were mainly performed for the industrial
mass production of safe and functional animal feeds containing insects. Continuous scientific innovations
and improved processing technologies will aid further advancements in this field. Therefore,
this review offers insights to identify directions of future research and provides information on
different insect-based feedstuffs for animals including terrestrial livestock, fish and shellfish, and
companion animals, as also discussed in various patents.