ABSTRACT
Insect farming is being promoted as a sustainable source of protein. Insects convert grain more efficiently than most other farm animals, but it would be more efficient to eat the grain directly. Rearing insects on food waste for human consumption would increase protein supplies, although feeding such insects to animals is probably less efficient than feeding the food waste directly. It may be efficient to produce animal feed from insects on substrates which are not suitable for animal consumption, if this can be achieved safely and legally. There is some evidence for insect sentiency and, if they are reared, effective steps should be taken to ensure their welfare during both rearing and slaughter. Alternative methods of improving the human protein supply include increasing the consumption of plentiful plant protein, whilst ensuring it is distributed more equitably, and developing microbial protein production. Insect feed would be a welcome addition to the diet of free-range pigs and chickens, but the concern remains that they may be reared industrially to feed factory farmed animals.
