Protein feed compositions and methods of making the protein feed compositions are disclosed herein. The protein feed compositions may comprise zein and are derived from a starch-based feedstock-to-ethanol fermentation conversion process such as a corn-to-ethanol conversion process. Methods of making the compositions include performing a starch-based feedstock-to-ethanol fermentation process in a manner that reduces the total heat exposure of the components of the protein composition as compared to a similar process which uses a cooking process to saccharify starch and/or a distillation process to separate the fermentation beer into ethanol and whole stillage. The process may include centrifugation of the fermentation beer resulting in a bulk solids mixture, extraction of a protein composition from the resulting bulk solids mixture, and desolventizing the extracted protein composition.
