academic and clinical studies exist on the use of cistus and oregano in animal nutrition

Numerous academic and clinical studies exist on the use of Cistus and oregano in animal nutrition (feed additives), gut health, and as an alternative to antibiotics.

Especially following the European Union's ban on antibiotic growth factors in feed, research on plants with high bioactive components such as Oregano and Cistus incanus has gained significant momentum.

We can examine the literature and prominent scientific findings in this field under the following headings:

1. Studies on Oregano

Oregano is one of the most extensively researched phytobiotics in the world as a commercial feed additive.

Performance and Gut Health in Poultry (Ruan et al., 2021): In this study conducted on yellow-feathered broiler chickens, thyme essential oil (OEO) was added to the ration at a rate of 150-300 mg/kg. The study results showed that; It has been proven that thyme alleviates local **oxidative stress** in the gut, increases natural antibody production (immunity), and positively modulates the gut microbiota, reducing harmful bacteria.

Rumen Development in Young Animals (Gansu Agricultural University, 2024):** In this recent study, it was found that thyme oil added to the ration of calves **regulated rumen microflora**, stimulated the production of essential fatty acids (VFA), and thus directly increased growth performance.

Combating Coccidiosis (Mohiti-Asli and Ghanaatparast-Rashti, 2015):** In coccidiosis (*Eimeria spp.*) infections, one of the biggest parasitic problems in poultry farming, it has been reported that adding 500 ppm of thyme leaf/oil to the feed reduces intestinal lesion scores and shows a protective effect.

2. Studies on Cistus incanus

The role of Cistus incanus in animal nutrition has come to the fore in recent years, with its recognition as **"one of the richest sources of polyphenols and ellagitannins"**.

Cellular Protection and Antioxidant Effect (Cyboran-Mikołajczyk et al., 2021):** In a study on pigs, *Cistus incanus* extracts were used to suppress the negative effects of high-fat and high-carbohydrate diets on the animals. Thanks to the plant's strong antioxidant and membrane-protective activities, it has been shown to protect the morphological structure of erythrocytes (red blood cells) and reduce physiological stress. * **Antiviral and Avian Influenza Protection (Droebner et al.):** A specific polyphenolic extract of *Cistus incanus* (*CYSTUS052*) has been clinically proven in laboratory animals to inhibit the attachment of the highly pathogenic **Avian Influenza A (Bird Flu)** virus to host cells (anti-adhesive effect).

Digestive System and Anti-Inflammation Prevention (Attaguile et al.):** It has been scientifically documented that aqueous extracts of Cistus inhibit congestion (blood flow) and hemorrhagic ulcers (intestinal/stomach bleeding) in the digestive system mucosa in a dose-dependent manner and exhibit gastroprotective (gastrointestinal protective) effects. ---

3. Combination and Synergy Studies (Why Both Together?)

In the scientific world, it is known that combinations of **carvacrol (from thyme)** and **polyphenols (from Cistus)** are more successful in breaking microbial resistance than the use of plant extracts alone.

Breaking Bacterial Resistance (MDPI, Comprehensive Review):** Comprehensive reviews published on *Cistus sp.* indicate that the combined use of phenolic compounds and essential oils of this plant disrupts the cell membrane integrity of bacteria with multidrug resistance (e.g., *E. coli* and *Staphylococcus aureus*) and **synerically multiplies** antibacterial efficiency.

Literature Review Suggestion for Industrial R&D

If you are developing a specific feed formulation (R&D) or preparing an academic report on this topic, you can search global databases (PubMed, ScienceDirect, Google Scholar) using the following keyword combinations:

Cistus incanus as dietary supplement in animal nutrition"* Synergistic antibacterial effect of carvacrol and polyphenols in broiler feed"* Phytogenic feed additives: Origanum vulgare and Cistus sp. on gut health"*

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