The Effects of Supplementation of Chlorella vulgaris Biomass on Egg Production and Composition of Laying Hens

Background: Chlorella vulgaris is rich in protein, beneficial fatty acids and antioxidants, making it a promising natural feed additive. Objectives: This study evaluates the effects of dietary supplementation with the microalgae C. vulgaris on the productivity and egg quality of laying hens. Methods: In a randomized design, 84 Lohmann Brown hens (47 weeks old) were divided into four groups: a control and three groups receiving 0.1%, 0.3%, or 0.5% C. vulgaris biomass in their feed over 8 weeks. Egg production, laying intensity, egg weight and composition were monitored. Results: The 0.5% supplementation significantly increased egg production and laying intensity, without affecting egg weight. Eggs from microalgae-supplemented hens showed largely stable protein, fat and energy content, while dose-dependent trends were observed for cholesterol (increasing up to 275 mg/100 g in the highest dose) and the omega-6/omega-3 ratio (rising from 7.75:1 in CON to 16:1 in CV5). Conclusions: These results indicate that C. vulgaris supplementation can improve egg yield and potentially enhance nutritional value, though care is needed regarding lipid profile changes. The study supports the use of microalgae as a sustainable feed additive in poultry diets, promoting productivity and contributing to environmentally friendly egg production.