What question did this study set out to answer?

The aim is to assess how oregano, cinnamon, and peppermint essential oils in hen diets influence egg quality and gut microbiota.

Nutritional enrichment of eggs through essential oil–supplemented laying hen diets and associations with intestinal microbiota

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Evaluates the impact of essential oil diets on egg quality and intestinal microbiota in hens, suggesting potential health benefits.

The aim is to assess how oregano, cinnamon, and peppermint essential oils in hen diets influence egg quality and gut microbiota.
Laying hens divided into four diet groups for 28 days: control, oregano, oregano+cinnamon, and oregano+peppermint.
Evaluation of sensory properties, textural qualities, and fatty acid profiles of eggs.
Microbiota analysis of intestinal samples and measurement of nutritional indices.
Essential oils did not alter sensory properties like flavor or texture of the eggs.
Oregano group showed significant differences in shear force measurements of eggs.
Supplementation reduced harmful bacteria while increasing beneficial Lactobacillus spp.
Dietary changes resulted in improved nutritional indices in egg fatty acids.

Muş et al. (2026) studied this question.

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