Trial Summary - Orego-Stim® Liquid Supports the Production of Higher Value Eggs in a Free Range System

Commercial Study


  • The production of larger, higher grade eggs are fundamental to the profitability of a layer farm.
  • This commercial study was undertaken to determine the effect of Orego-Stim® Liquid (OSL) supplementation in drinking water, on the grading of eggs produced from hens in a free range housing system.

  • OSL is a high quality eubiotic composed of 100% natural oregano essential oil (OEO). Natural OEO has many properties including antimicrobial, antioxidant, anti-inflammatory and immunomodulatory functions. In previous trials, supplementation has been shown to support the production of higher value eggs in various systems.

  • OSL supplemented hens produced larger eggs and a higher percentage of 1st class eggs, resulting in a return on investment of 14.4:1.


A commercial trial was conducted in collaboration with a free range egg producer in Europe (2020/2021), to determine the effect of OSL on hen performance. Two groups of 32,000 hens were used in the study, a control group and an OSL supplemented group. OSL was administered via a Dosatron at 300ml/1000L of drinking water (two times standard inclusion) from 21 to 43 weeks of age. The inclusion rate was reduced to 200ml/1000L of drinking water until 58 weeks of age, and then increased again to 300ml/1000L of drinking water until 76 weeks of age (study termination). Egg production data was collected daily.


Broiler performance at day 30
Broiler performance at day 30
Hens supplemented with OSL:
  • Produced more large and medium graded eggs (Figure 1).
  • Were 1.1 times* more likely to produce 1st class eggs (Figure 2).

  • Had fewer egg losses at the packing station (Figure 3).

  • Provided an overall return on investment of 14.4:1.

In conclusion, OSL may support the production of larger eggs, and a higher percentage of 1st class eggs in free range production systems, leading to increased profitability from the sale of these higher value eggs.

Want To See The Benefits Yourself?

Orego-Stim® is Anpario's 100% natural high quality oregano essential oil (OEO) additive, available in both liquid and powder.

  • Aromatic smell and taste of OEO can improve palatability of feed and help encourage voluntary feed and water intakes in your layers.
  • Supports digestive health and nutrient absorption.
  • Rich in antioxidants to maintain poultry health and well-being.
  • Can be used to support programmes to reduce antimicrobial use.
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*Odds ratio 1.138 (95% CI), Pearson chi-square p=0.0027

Disclaimer: No guarantee of performance is given. All economic benefits claimed in this document were correct at the time of publication.

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