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Use of Microencapsulated Bioactive Compounds on the Antioxidant System of Tilapia Juveniles Undergoing Sex Reversal

BRAZIL
Wednesday, July 03, 2024, 02:00 (GMT + 9)

The following is an excerpt from an article published by O Presente Rural:

The beneficial effects on the immune system are of great importance for the performance of animals, since there is a large energy expenditure by the body when it is necessary to use endogenous antioxidant activities.

Source: s3piscicultura

Supplementing substances with the potential to improve immunity becomes extremely important due to the intensification of animal production. Molecules with antioxidant potential have direct and indirect action on the immune system, as they act to combat physiological stress and that caused by external agents such as pathogenic microorganisms and toxins that may come from water or food. The immune system of animals has a strong influence on the zootechnical and sanitary parameters of animal production. In this sense, bioactive compounds extracted from plants are efficient alternatives in increasing endogenous antioxidant capacity, and in combination with organic acids they become excellent antimicrobials that provide protection against pathogens and increase intestinal quality, enabling better zootechnical responses.

Source: O Presente Rural --> 

In the case of psychculture, the intensification of breeding follows the market's needs to provide quality protein. Tilapia (Oreochromis niloticus) is one of the main species in the Brazilian production system, making it essential to optimize performance results. In this sense, the sexual inversion of these animals aims to optimize production, however it can influence oxidative stress and negatively impact the immune system and consequently performance. Therefore, the objective of developing this study was to evaluate a synergistic blend of bioactive compounds and microencapsulated organic acids on the antioxidant parameters and immune response of sexually inverted fry.

Methodology

Figure 1. Effect on scavenging the DPPH (2,2-diphenyl-1-picryl-hydrazyl) radical between experimental groups. NI – animals not inverted and not supplemented with the microencapsulated material; I – animals inverted and not supplemented with the microencapsulated material; NI+M – animals not inverted and supplemented with the microencapsulated and I+M – animals inverted and supplemented with the microencapsulated. Different letters above the bars represent significant differences between treatments using the Tukey test (P<0.05).

The experiment was conducted at the Aquaculture Laboratory of the State University of Maringá and approved by the Ethics Committee for the Use of Animals. The design used was completely randomized, arranged in a factorial scheme (2X2), involving sexual inversion and supplementation with microencapsulated substances. 480 fry, 60 days old and initial weight of approximately 3.08 g, were used, divided into four treatments: NI – animals not inverted and not supplemented with the microencapsulated; I – animals inverted and not supplemented with the microencapsulated material; NI+M – animals not inverted and supplemented with the microencapsulated and I+M – animals inverted and supplemented with the microencapsulated.

Figure 2. Enzymatic activity of superoxide dismutase (SOD) and catalase (CAT) between the experimental groups. NI – animals not inverted and not supplemented with the microencapsulated material; I – animals inverted and not supplemented with the microencapsulated material; NI+M – animals not inverted and supplemented with the microencapsulated and I+M – animals inverted and supplemented with the microencapsulated. Different letters above the bars represent significant differences between treatments using the Tukey test (P<0.05).

Each experimental group was distributed in six 100 L tanks, with 20 fry/tank, totaling 24 experimental tanks and 120 fry per experimental group. The animals underwent a five-day adaptation and an experimental period of thirty days. The dosage of the microencapsulated product was 100 g/t mixed with the base diet (wheat, ground corn, soybean meal, chicken offal meal, defatted corn germ, meat meal, sodium chloride, DL-methionine, L- lysine, vitamins A, D3, E, K3, B1, B2, B3, B6, B7, B9, B12, C, pantatenic acid, choline, cobalt, copper sulfate, BHA, BHT, propionic acid, ammonium hydroxide [Continues...]

Author: Mariana Ornaghi, PhD in Animal Science and Research and Development coordinator at Safeeds Animal Nutrition | The Rural Present | Read the full article by clicking the link here (only available in Portuguese)

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