Solid-State Hydrolysis (SSH) Improves the Nutritional Value of Plant Ingredients in the Diet of Mugil cephalus

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2022-02Department
BiologíaSource
Fishes, Vol. 7, Núm. 1Abstract
The possibility of improving the nutritional quality of plant byproducts (brewers’ spent
grain and rice bran) through an enzyme treatment was tested in a formulated feed for grey mullet
(Mugil cephalus). The enzyme treatment was carried out by Solid-State Hydrolysis (SSH) using a
commercial preparation including carbohydrases and phytase. A feed prepared without the treatment
and a commercial feed for carp were used as controls. In a preliminary short-term trial carried out at
laboratory facilities, fish receiving the enzyme-treated feed showed significant improvement in both
FCR and SGR when compared to those obtained with the untreated diet, although both experimental
diets presented worse values than those obtained with the commercial feed. Different metabolic
indicators including higher values of muscle glycogen and plasmatic triglycerides supported the
positive effect of the enzyme treatment on the nutritional condition of the fish over those fed on the
diet containing non-treated ingredients. Results of growth and feed efficiency that were obtained
in a second long-term trial developed for 148 days under real production conditions evidenced the
equivalence among the experimental and commercial diets and confirmed that enzyme pretreatment
of plant ingredients by SSH may be a useful procedure to improve the nutritive value of high
fiber plant byproducts when included in practical diets for this species and others with similar
nutritional features.
Subjects
aquaculture feeds; plant byproducts; enzymatic pretreatmentCollections
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