Page 56 - New additives and ingredients in the formulation of aquafeeds

Future According to the chemical characterization values ​observed, plant protein
hydrolysates may have a promising future in aquaculture nutrition and
not just because they possess an important nutritional role, but because
today some of these hydrolysates peptides may provide certain benefits
to the physiological functions of a living organism (antioxidant, chelator,
antimicrobial, immunostimulant, etc). Thus, in recent years, there has been
investigating the presence of certain dietary protein amino acid sequences,
bioactive peptides, which could contribute with different beneficial
functions for the consumer. Bioactive peptides can be defined as amino
acid of small inactive sequences inside the intact protein but with the
possibility of being released during the digestion of food in the organism
or by a previous process like an enzymatic hydrolysis. Some of the bioactive
peptides described are opioid peptides and antagonists of opioid peptides,
antithrombotic peptides, inhibitors of angiotensin converting enzyme,
hypocholesterolemic, antioxidant peptides and phosphopeptides.
Experimental
trials
TRIAL 1: SOYBEAN MEAL REPLACED BY RAPESEED HYDROLYSATE WITH
LOW CONTENT IN GLUCOSINOLATES IN FATTEN DIETS FOR SEABREAM
(Sparus aurata)
Summary:
Rapeseed is one of the vegetal ingredients with less anti-nutrients, being
the glucosinolates (highly toxic in the diet for its negative effects on thyroid
function) those that can affect in higher way. Currently, the use of genetically
improved seeds combined with the advances in the technologies used in the
meals production, allow having rapeseed meals and hydrolysates with very
low levels of antinutrients.
Material and Methods:
We used seabream with initial weight of 160-170 g about 5 months to
duplicate theirs weights. These fishes were divided into 3 circular tanks
of 500 L with 20 fishes per tank. Approximately every 40 days from the
beginning of the experiment and until the end of it, each fish from each tank
were weighed to calculate the different growth rates and food conversion.
At the beginning and end of the test, different measures of length, weight,
viscera, visceral fat and whole fish sample and steak for the calculation of
the parameters for biological and biochemical analysis were made (Photo 1).
The start trial conditions were as follows:
Temperature (23-24ºC);
Feed Intake rate (1.5-1.6%);
Intakes/day: 2;
It was developed and produced a total of 4 diets (Diet 1 - Diet 4) based on
a previously tested control formula, with a level of protein/lipids 42/21.
They were designed with the aim of including increasing levels of rapeseed
hydrolysate with low glucosinolate content (from the oil extraction),
to replace soy meal 47%, both diets with a composition and content of
nutrients similar between them (Table 4).
54 Plant protein isolates and hydrolysates as alternative to the animal protein in aquaculture diets