Expeller soy meal an alternative for young animal feed

Animal Nutrition Views

Ioannis Mavromichalis, Ph.D., gives his views on poultry, pig and dairy nutrition based on his experience as a nutrition consultant with clients around the world.

Expeller soy meal an alternative for young animal feed

Courtesy United Soybean Board

Product has higher levels of residual oil, energy value

Expeller soybean meal is a product, of usually small-scale production, that remains after extraction of soy oil by force, instead of using solvents. It is usually richer in residual oil compared with solvent-extracted soybean meal, which is the soybean meal we encounter most often.

Expeller soybean meal can be an interesting ingredient when offered locally at a competitive price. With levels of residual oil – reaching up to 10% depending on extraction efficiency – and consequently higher energy value compared with traditional soybean meal, expeller meal can provide an alternative to increasing energy costs.

I have used expeller meal with great success, even in high-quality feeds, as a replacement for extruded full-fat soybeans and other refined protein sources. However, such expeller meal has always been of the highest quality, as determined by a low trypsin-inhibitor-activity index, something I always check when it concerns young animal feeds.

Nevertheless, as a consultant, I have also come across products of low quality, usually undercooked or rancid, that failed to replace even average quality soybean meal. The usual complaint here is that low-quality expeller meal can be inferior to a mix of traditional soybean meal plus soy oil. Part of the problem could also be the assignment of inaccurate values for energy (metabolizable or net) and/or (digestible) amino acids.

As is always the case, proper characterization of each raw material is key to successful feed formulation, and expeller soy meal is no exception here.