REPLACING FISH MEAL WITH UNTREATED AND ENZYMATICALLY TREATED TORULA YEAST (CYBERLINDNERA JADINII) AFFECTS PELLETING DIE FLOW RESISTANCE AND PHYSICAL PROPERTIES OF THE FEED PELLETS

Dejan Dragan Miladinovic

doi:10.5937/ffr0-61739

Dejan Dragan Miladinovic Norwegian University of Life Sciences

DOI: https://doi.org/10.5937/ffr0-61739

Keywords: fishmeal alternative, protease, glucanase, single die pelleting, pellet strength, underwater swelling

Abstract

Yeast is gaining importance as a novel feed ingredient. Although fishmeal generally provides better feed conversion in farmed aquatic animals, research suggests that the torula yeast Cyberlindnera jadinii (CJ) is a promising alternative to fishmeal. This study examines the effects of replacing fishmeal with torula yeast (CJ), both untreated and treated with protease and endo-exo 1.3-beta-glucanase, on pellet production. The first experiment evaluated changes in flow resistance and pellet quality when fishmeal was replaced with yeast. The second experiment focused on how enzyme-treated yeast influenced these factors. Pellets containing 20% CJ, whether treated or not, showed increased flow resistance and higher pellet strength. Pellets formulated with 10% and 20% CJ, as well as pellets composed solely of yeast material used as a control, exhibited water-repellent properties, potentially enhancing feed intake, reducing waste, and supporting sustainable production. However, pellets with 10% and 20% enzyme-treated CJ showed fat-repellent behavior, which may hinder post-production processes. Enzymatic treatment reduced underwater swelling in these pellets, and minimal hydrolysis is recommended to limit disintegration. Enzyme treatment reduced surface roughness, with pellets containing 20% treated CJ exhibiting the smoothest texture.

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