ReviewVeterinary and animal science2026
A meta-analysis of
Review in Veterinary and animal science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In response to the growing demand for natural feed additives in poultry production, this study systematically reviewed and meta-analyzed the effects of Origanum vulgare (oregano) on laying hen performance and egg quality. Six databases (PubMed, ProQuest, Scopus, Web of Science, SID, and MagIran) were comprehensively searched from database inception to May 10, 2026. Only randomized controlled trials evaluating oregano supplementation (as essential oil or powder) in laying hens were included. Outcome measures comprised egg production, egg weight, shell thickness, yolk color, Haugh units, yolk index, and shell weight. Data were analyzed using a random-effects model, with subgroup analyses based on oregano form and supplementation duration. Publication bias was also assessed. Oregano supplementation significantly enhanced egg production, egg weight, shell thickness, and yolk color, with biologically meaningful improvements for commercial production. Subgroup analyses revealed form-dependent effects: powdered oregano improved egg weight, yolk color, shell thickness, and shell weight but reduced Haugh units; essential oil increased Haugh units but decreased yolk index. Both forms increased egg production. Furthermore, improvements in shell quality and yolk color were only evident after more than nine weeks of supplementation. In conclusion, oregano effectively improves egg production and quality in laying hens, with outcomes dependent on the form and duration of use. Long-term supplementation (>9 weeks) is recommended, using powder for better shell and yolk characteristics or essential oil for firmer albumen. Meta-regression confirmed form-specific effects, with powder superior for production and shell traits, and essential oil for albumen quality.
Indexed as
Identifiers
What Socratic holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.