Uso de óleo-resina de copaíba sobre o desempenho produtivo de poedeiras e qualidade de ovos

Abstract

Vegetable sources rich in antioxidant activity have been used in layer diets in order to improve performance and egg quality. Thus, this study aimed to evaluate the effect of dietary copaiba balsam on the productive performance of brown-egg layers, internal and external quality of eggs and their shelf-lives. A 126-days study, divided into 6 productive cycles of 21 days, was run. A total of 144, 42 weeks old, Isa brown layers were allocated in cages (3 birds per cage), in a total of 48 cages. A completely randomized experimental design was used, with 4 treatments and 12 replicates per treatment. The dietary treatments consisted of a basal corn-soybean meal diet (control), supplemented with different levels of copaiba balsam (CB). Therefore: T1-Control; T2- T1 + 5 mg CB/bird/day; T3- T1 + 10 mg CB/bird/day and T4- T1 + 20 mg CB/bird/day. Isoenergetic, isoproteic, isophosphoric and isocalcic diets were used. Perfomance (bodyweight, feed intake, egg production, feed conversion (feed/dozen egg or per egg mass) and external egg quality (egg weight, egg mass, specific gravity, shell thickness, shell weight and internal quality of eggs (Haugh units, yolk weight, albúmen weight, yolk color and shelf life)were evaluated. The data were submitted to analysis of variance , with the 5% level of significance, Tukey and average contrast .Results indicate the use of copaiba balsam brings and improvement in yolk color at the end of the storage period.