Laboratory analysis of expeller vs pre-press solvent extracted crambe meal

V. L. Anderson and J. C. Gardner

Crambe has been successfully grown and processed on a commercial scale in North Dakota for a number of years, although acreage has varied. The future production levels appear to be far more stable with the development of a new company, AgGrow Oils Limited Liability Company (LLC). This company is establishing long term markets for the high erucic acid oil from crambe. The residual meal will be available in larger and more consistent supplies as a protein source for ruminant livestock or other uses. AgGrow Oils will process crambe using mechanical extraction methods rather than pre-press solvent extraction, used in previous crambe crushes. The mechanical extraction process involves reducing the particle size of the seed, extrusion, conditioning to lower moisture content with heat, and two final passes through expellers to remove the oil. The remaining meal will have higher lipid or fat content than solvent meal as mechanical oil extraction is less efficient. In addition, extruded meals have higher proportions of escape protein. This is protein that is slightly altered during the heating/crushing process so it is not degraded as readily by the microbes in the rumen. Higher levels of this "escape" protein are more useful to stressed or very high production ruminants or can be balanced with non-protein nitrogen sources for more economical supplements.

Crambe will be processed throughout the year at the AgGrow Oils plant at Carrington ND with scheduled intermittent crushes of other minor oil seeds. Meal will be available continually from contract purchases or on the spot market. The plant is under construction and expects to be on line prior to Jan. 1, 1998.

This paper presents results of comparative laboratory analysis of crambe meal from pre-press solvent vs meal from a small scale test crush using mechanical expeller extraction.

Affiliation of co-authors and non-CREC staff: John Gardner, general manager, AgGrow Oils LLC.

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