Bioeficácia da inclusão do óleo de resíduo de pescado em rações de poedeiras comerciais

Abstract

The present study aimed to evaluate the digestibility, performance, egg quality, sensory features, biochemical profile analysis, fatty acid profile and cholesterol of egg yolk, and economic analysis of laying hens fed diets with increase levels of fish waste oil. The fish waste oil was obtained from Commercial Refrigerator located in the Itacoatiara town. In the digestibility analysis, 72 Hisex White laying hens with 25 weeks of age were distributed in two treatments (0% and 3.5% oil inclusion), being analysed by total feces collection method. In principal stage of the study, 192 Hisex White laying hens with 29 weeks of age were distributed in a experimental design completely randomized constituted by eight treatments (0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, and 3.5% fish waste oil) and four replications of six birds each. The experimental period was divided in five 21-day periods. 640 eggs were used to internal and external quality evaluations. In the digestibility results, digestibility of ether extract was statistically higher in birds fed diets containing 3.5% of fish waste oil. Feed intake, egg production, and egg mass were significantly influenced by the inclusion of fish waste oil, where the maximum inclusion level had a negative effect on these parameters. The fish waste oil used did not affect the egg quality. The higher level of fish waste oil negatively affected the eggs' taste. The inclusion of fish oil had a significant effect on the serum biochemical profile of laying hens, mainly on glucose, triglycerides, total cholesterol and uric acid concentrations. The inclusion level of 3.5% of fish waste oil caused greater imbalance in the serum biochemical profile of hens. It is important to metion that the eggs were enriched with essential fatty acids, especially arachidonic acid (AA) and docosahexaenoic acid (DHA). The inclusion of fish waste oil in the diets to laying hens changed the cholesterol levels of eggs. In conclusion, fish waste oil can be used as an alternative feedstuff in diets to commercial laying hens, where the inclusion level of 1.25% presented better economic viability. The 3.5% level of inclusion provided a decrease in performance and significant economic losses.