The chemical extraction is the most effective way how to obtain crude vegetable oil, but on the other hand screw pressing of oil seeds is becoming increasingly popular. Mechanical extraction (without chemical solvent) by screw pressing has some benefits against chemical extraction such as lower investment cost, lower space requirements, lower safety measures and greater food safety of the products. On the other hand it has yield and capacity limitations. Different screw pressing technologies have different quality of products (crude oil and expellers). Expellers and extracted meals are the most common sources of protein in animal nutrition. Nowadays on the market there are expellers and extracted meals available from different technologies with different feeding value. During the study there was analysed relative protein digestibility from soybean, rapeseed and sunflower expellers and extracted meals from different technologies. In general expellers have the same or better relative protein digestibility than extracted meals. Adding dry extruder to process of screw pressing brings some benefit to the process such as increasing feeding value of expellers and increasing crude oil yield. Because of higher oil content expellers have higher energetic value and needs to be seen as different product with higher market price.
