Abstract

In Europe, rapeseed is a common oilseed crop, resulting in the production of 20 million tons of rapeseed press cake yearly. This press cake can be further upcycled and a protein fraction can be extracted for food purposes, leaving de-proteinized fiber-rich residues. This study examined the use of these residues in the production of oyster mushrooms (Pleurotus ostreatus) and of the spent substrate as feed, since mushroom cultivation may improve the feed properties of substrate. In terms of mushroom production, the addition of rapeseed press residues was beneficial, giving significantly higher biological efficiency (BE = 93.1 +/- 11.0%) compared with the control, sugar beet pulp substrate (70.0 +/- 6.6%). This increase in productivity can most likely be explained by higher energy content in the substrate supplemented with lipid-rich rapeseed residues. Despite differences in BE between the substrates, high similarity was observed in lipid composition of the fruiting bodies (lipid profile dominated by linoleic acid (18:2), palmitic acid (16:0), and oleic acid (18:1)), and in protein and moisture content. After mushroom harvest, approximately 70% of the initial dry weight of both substrates remained as a possible feed source. Both substrates had significantly lower levels of carbohydrates and unchanged neutral detergent fiber content after mushroom harvest, and both gave lower in vitro digestibility, total gas production, and methane production. However, protein concentration differed between the substrates, with the highest concentration (15.8% of dry weight) found in spent substrate containing rapeseed press residues. The result of the present study suggests that the de-proteinized rapeseed press residue is a resource well-suited for use in the production of mushrooms and feed.

Keywords

Brassica napus; de-proteinized oil press cake; In -vitro methane production; Mushroom substrate; Ruminant feed

Published in

Journal of Environmental Management
2023, Volume: 344, article number: 118742

SLU Authors

• Lager, Ida

  • Department of Plant Breeding, Swedish University of Agricultural Sciences
    

• Chagas, Juana

  • Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
    

• Ramin, Mohammad

  • Department of Applied Animal Science and Welfare, Swedish University of Agricultural Sciences
    

• Hultberg, Malin

  • Department of Biosystems and Technology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

Ensure sustainable consumption and production patterns
End hunger, achieve food security and improved nutrition and promote sustainable agriculture


UKÄ Subject classification

Animal and Dairy Science
Food Engineering


Publication identifier

DOI: https://doi.org/10.1016/j.jenvman.2023.118742

Permanent link to this page (URI)

https://res.slu.se/id/publ/123435