Tanino hidrolisável em dietas de codornas japonesas em fase de postura

Abstract

This dissertation is presented in 2 chapters, being a literature review and field research. Chapter 1: The objective of the literature review was to elucidate the main advances related to the use of natural zootechnical additives, including tannins, listing the ability to promote nutrient absorption, improvement in intestinal villi and immune status of birds, contributing to production and quality of eggs. These natural compounds can play a crucial role in improving bird performance and health. Furthermore, tannins act as natural antioxidants, protecting biomolecules against damage caused by free radicals. This antioxidant action is essential to prevent lipid oxidation, which is one of the main causes of quality loss in poultry products. Chapter 2: The study was conducted with the objective of evaluating the effect of different levels of plant extract based on hydrolyzable tannin in the diet on performance, egg quality, intestinal health, lipid profile and antioxidant potential of egg yolks. Japanese quails. Furthermore, evaluate the effects of the plant extract based on hydrolysable tannin on egg quality, lipid profile and antioxidant potential of the yolk of quail eggs stored for up to 28 days. The study was carried out in the experimental aviary for laying birds, in the facilities intended for coturniculture at the Faculty of Agricultural Sciences of UFGD, in the municipality of Dourados, Mato Grosso do Sul, lasting 56 days, using a flock of 324 Japanese quails (Coturnix coturnix japonica) at peak laying. The birds were distributed in a completely randomized design into six treatments with the inclusion of plant extract based on hydrolyzable tannin at six levels: Control, 250, 500, 750, 1,000 and 1,250 g/ton, with nine replications and 6 quails per experimental unit. . Productive performance, egg quality, organ biometry, blood biochemical profile, intestinal histomorphometry, lipid profile and antioxidant potential of the yolk were evaluated. An egg storage test was carried out for 28 days, evaluated weekly. Tannic acid-based hydrolyzable tannin supplementation did not affect the performance, organ health, blood biochemical parameters or intestinal morphometry of Japanese quails in the study. Egg quality was not harmed by the inclusion of 250 g/ton of hydrolyzable tannin, and even with maximum inclusion, egg quality remained satisfactory. The addition of hydrolyzable tannin resulted in an increase in unsaturated fatty acids and improved the ratio between unsaturated and saturated fatty acids in egg yolk. This contributed to a healthier lipid profile in eggs. Furthermore, the inclusion of hydrolyzable tannin increased the antioxidant potential of egg yolks, suggesting benefits for lipid stability and consumer health