Alternative protein feeds

Alternative protein feeds comprise raw materials used as an alternative to typical concentrated feed bases such as maize, soya and wheat for the feeding of farm animals.


Aim and innovation

The basic idea of alternative protein feeds is to produce and import less protein feed such as soya worldwide. Today, about half of the protein crops grown globally such as soya end up as concentrated feed in the troughs of chicken, pigs and cattle that are bred for maximum performance[1]. The production of this protein-rich fodder is accompanied by the expansion of agro-industrial areas, the over-fertilization of agro-ecosystems and the greenhouse gas emissions caused by land-use changes, the deforestation of large areas of land and the loss of biodiversity[2]. By reducing soya imports, the land earmarked for feed production could be used for the cultivation of food and thus contribute to securing food sovereignty[3].

Since in countries that import animal feed, conventional regional protein sources cannot meet the large demand of industrial animal husbandry[4], much research is currently being conducted into alternative protein animal feeds. Some of those being currently discussed are microorganisms, algae and insects.

The technology for producing a protein powder out of microorganisms that can be fed to animals was developed in aerospace. Microbes such as bacteria, yeasts and fungi are cultivated and processed in industrial plants. The production is cost-effective and has a favorable ecological balance. An analysis of the potential of microbial protein for feed production showed positive results. It could be concluded that the global area under cultivation, greenhouse gas emissions and nitrogen losses can be greatly reduced.[5]

Microalgae such as spirulina with its protein content of up to 70% and high nutrient density have the advantage that they grow rapidly and can be produced in a closed system with high output.[6] Insects have low demands on their environment and on their food and can also be bred on waste. This means that breeding could also be beneficial for waste recycling. In a study at the Faculty of Agricultural Sciences in Göttingen, both raw materials were subjected to a sample. Pigs and broilers were fed with dried ground larvae of the black soldier fly and spirulina powder. The experiment showed that both feedstuffs brought valuable protein qualities and were well accepted by the animals.[7]

As organic livestock farming aims at a closed operating cycle, clover grass plays an important role as animal feed and soil improver/green manure (as an alternative to chemical fertilizers). Fresh or ensiled, clover grass is used in dairy cattle feeding as protein supplement feed. In Denmark, a technical process has recently been developed to break down proteins from clover grass in order to produce pig feed thereof. It is interesting to note that, according to the authors, the protein composition is more suitable for pigs and poultry than that of soya. The advantages of clover grass even extend beyond its nutritional qualities. Clover grass requires less fertilization than grains and soya, contributes to the building-up of humus and leads to lower nitrogen leaching and need for plant protection. The protein yield is essentially higher than with grains.[8]

Traditional, long forgotten and rarely used feedstuffs such as foliage can also be considered as alternatives.


ACRRES - Netherlands[11], EnAlgae[12], Green Protein Biorefinery - Denmark, Inseckt, Ynsect[13]


intermediate consumption, processing, trade


feed industry, producers with livestock

Development and current dynamics

Alternative protein feeds are advancing into the discourse due to the generally growing awareness of environmental problems by the agricultural industry. There is great interest in Europe to reduce the need for importing soya. The implementation is still failing because of legislation[9]. While algae proteins are permitted in the EU, insect proteins may only be used in aquaculture since 2017[10].


Sustainability potential


  • biodiversity
  • soil
  • water
  • climate
  • air
  • resource efficiency in production and consumption
  • promotion of regional
  • closed nutrient cycles


  • increase of food security
  • promotion of the recycling economy


  • animal welfare

Risks / disadvantages

The approaches presented here for obtaining protein feed from microorganisms, algae and insects are highly industrialized processes. Their breeding will most likely only be carried out on a large scale in Germany, as industrial facilities are required for cultivation and processing. For this reason and because of the many regulations, insect breeding will most likely not be a solution for small-scale agriculture in Germany, unlike in East Asia. At present, it is also not permitted in Europe to feed bred insects with organic waste.[14] Certain risks include unknown insect diseases that can be transmitted to humans, heavy metal contamination and ethical issues. It also remains questionable whether the approved sources of feed for insects would be sufficient in quantity to serve the today's high number of livestock in intensive agriculture.

This is linked to the overarching question of the extent to which the niche of alternative protein feeds puts intensive industrial livestock farming into question. The niche merely replaces a product or a raw material in the intermediate consumption. Since a continuous high consumption of resources can still be assumed, the food system gets thus adapted rather than transformed. In order to reduce the climate-damaging industrial meat production and ethically questionable animal husbandry, it requires a profound change in the consumption patterns.

[1] Potsdam-Institut für Klimafolgenforschung (2018): Astronautennahrung für Kühe: Industriell gezüchtete Mikroben könnten Rinder, Schweine und Hühner mit weniger Umweltschäden ernähren. www.pik-potsdam.de/aktuelles/pressemitteilungen/astronautennahrung-fuer-kuehe-industriell-gezuechtete-mikroben-koennten-rinder-schweine-und-huehner-mit-weniger-umweltschaeden-ernaehren (20.02.2020)

[2] Mottet, A. et al. (2017): Livestock: On our plates or eating at our table? A new analysis of the feed/food debate. Global Food Security, 14, pp. 1–8.https://doi.org/10.1016/j.gfs.2017.01.001; Steinfeld, H. et al. (2006): Livestock’s Long Shadow: Environmental Issues and Options.

[3] Rehmer, C. (2018): Flächenbindung: Grenzen für Nutztier. Heinrich-Böll-Stiftung, Bund für Umwelt und Naturschutz Deutschland & Le Monde Diplomatique. Fleischatlas 2018 – Daten und Fakten über Tiere als Nahrungsmittel. pp. 20-21

[4] Benecke, C. (2019): Klee statt Soja? Bei Kleegras denkt man als Erstes an Futter für Kühe. Aber das Eiweißfutter ist auch für Schweine interessant. DLG-Mitteilungen 2/2019, p. 71.

[5] Pikaar, I. et al. (2018): Decoupling Livestock from Land Use through Industrial Feed Production Pathways. Environmental Science & Technology. 52(13)., pp. 7351–7359.https://doi.org/10.1021/acs.est.8b00216

[6] Conde-Petit, B. et al. (2019): How can we find the protein mix for 2050? Bühler Whitepaper. p.3.

[7] Göttinger Tierfutter-Forschung (2018): Schweine fressen Algen und Insekten. https://www.hna.de/lokales/goettingen/goettingen-ort28741/goettinger-tierfutter-forschung-schweine-fressen-algen-und-insekten-9608525.html (20.02.2020); Reiter, W. & Rützler, H. (2018): Insekten: Alte und neue Nützlinge. Heinrich-Böll-Stiftung, Friends of the Earth Germany & Le Monde Diplomatique. Fleischatlas 2018 – Daten und Fakten über Tiere als Nahrungsmittel. pp. 44-45.

[8] Benecke, C. (2019): Klee statt Soja? DLG-Mitteilungen 2/2019, p. 71.

[9] The Novel Food Regulation 2015/2283 regulates the health assessment of novel foods, such as algae, insects and microorganisms, before they can be approved and placed on the market.

[10] Weka Business Medien GmbH (2018): Insekten und Algen: Proteinquelle fürs Tierfutter.   https://www.labo.de/news/nachhaltigkeit-in-der-tierzucht-insekten-und-algen--proteinquelle-fuers-tierfutter.htm (20.02.2020); Reiter, W. & Rützler, H. (2018): Insekten: Alte und neue Nützlinge. Heinrich-Böll-Stiftung, Friends of the Earth Germany & Le Monde Diplomatique. Fleischatlas 2018 – Daten und Fakten über Tiere als Nahrungsmittel. pp. 44-45

[11] Acrres (n.d.): Acrres. http://www.acrres.nl/ (20.02.2020)

[12] W. C. (2020): Home. EnAlgae. http://www.enalgae.eu/index.htm (20.02.2020)

[13] Ynsect, Premium Natural Feed. (n.d.). http://www.ynsect.com/en/ (20.02.2020)

[14] German Environment Agency et al. (2019): Trendanalyse „Fleisch der Zukunft“. Umweltpolitische Handlungsoptionen für die Gestaltung von pflanzenbasierten, insektenbasierten und In-vitro produzierten Fleischersatzprodukten. Input paper for the expert workshop „Fleisch der Zukunft“ on the 17.9.2019 in Berlin. 27. September 2019. p.13.