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Spray-dried eggs: an economical and sustainable high-quality source of nutrition for aquaculture feeds By Ingmar Middelbos, Senior Technical Services Manager, IsoNova Technologies LLC, USA

Spray-dried chicken egg product (Gallus domesticus) has a long history of use in human food, pet food, and terrestrial livestock feeds, primarily because of its high-quality protein. The essential amino acid profile of egg is considered ideal for nearly every species. Therefore, egg protein is used as the benchmark for in vivo evaluation of protein quality in feedstuffs (Donadelli et al., 2019). Despite its success in livestock feeds and pet food and the apparent knowledge in the aquaculture industry about the high nutritional value of eggs (Hertrampf and PiedadPascual, 2000), adoption in aquaculture feeds remains limited. Likely, historical assumptions about availability and/or cost of egg products are key factors, but these outdated assumptions should be challenged.

Fig. 1. Feed-grade spray-dried eggs as powder (left) and micro-granule (right).

The nutritional package of eggs make it uniquely suited for aquaculture, and when evaluated on a cost-in-use basis, eggs are exceedingly cost effective vs. current alternate ingredients. In addition, dried egg product can enhance the sustainability profile of aquaculture feeds while also providing end consumers with a recognizable and easy to understand “feed my food eats� narrative.

Spray-dried eggs processing and composition Dried, feed-grade eggs are made by processing (100% USA-origin) eggs and separating the egg liquid from shell. The liquid is spray-dried into a powder, which may be microgranulated to improve handling (Fig. 1). The process includes a pasteurization step to minimize biosecurity risks, but the eggs are not cooked at high temperatures. This low-temperature processing ensures that heat-sensitive amino acids such as lysine remain intact and available. A high-quality dry egg product analyzes well above 90% available lysine and above 95% in pepsin digestibility. Additionally, the

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Aquafeed vol 11 issue 2 2019  

Aquafeed magazine is focused on advances in feed formulation and processing for aquatic species. It is the quarterly magazine of Aquafeed.co...

Aquafeed vol 11 issue 2 2019  

Aquafeed magazine is focused on advances in feed formulation and processing for aquatic species. It is the quarterly magazine of Aquafeed.co...

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