Qualidade fisico-química de ovos de poedeiras semipesadas criadas em sistema convencional, cage-free e free-range

Abstract

Was evaluated the effect of temperature and storage time on the physical-chemical quality of laying eggs created on different systems. We used 1350 eggs of laying hens Isa Brown with 46 weeks old. The experimental design was completely randomized (DIC), in 3x2x5 factorial design, with three production systems (conventional, cage-free and free-range), two temperatures (ambient and chilled) and five storage time (zero, 7, 14, 21 and 28 days), with 15 repetitions. We evaluated the percentage of weight loss, specific gravity (g/cm³), Haugh units, yolk index (g) and percentage of yolk and albumen, the lipid oxidation, pH of the albumen and yolk.  The results were submitted to analysis of variance and means compared by Tukey test at 5% significance level. All the parameters were significantly different (p<0.05), with worse results (P<0.05) in conventional system for the percentagens of yolk and albumen in the cage-free system, however this system was the best for the yolk pH and UH. The eggs in the refrigeration had the best results. Concludes that the physical-chemical egg quality in different systems can be influenced by temperature and storage time kept the eggs under refrigeration obtained better results for all parameter.