Origanum vulgare


Other Names:

Common Turkish Oregano, European Oregano, Oregano, Pot Marjoram, Wild Marjoram, Wild Oregano


  • Antiseptic
  • Anticoccidial
  • Antihelmintic
  • Antibacterial
  • Antifungal
  • Antioxidant
  • Anti-inflammatory
  • Antiviral
  • Immunity
Oregano (Origanum vulgare) is a widely cultivated, perennial herb, aromatic plant and spice belonging to the Labiatae family. The primary bioactive components in oregano are carvacrol, thymol, beta-terpinene and p-cymene, are known to aid in inhibiting pathogenic bacterial growth, stimulation of the digestive system, and improvement of growth performance in birds. Oregano leaves are the most commonly used part of the plant, but strangely, the aroma and flavor of the leaves is far greater when the herb is dried than when the leaves are fresh. Specific applications relating to poultry:
  • Immune enhancing and Antibacterial: Oregano can help boost chickens immune systems and helps fight off E.coli and Salmonella.
  • Antiaflatoxins: Oregano has shown potential for a natural method of control of aflatoxins in corn and soybeans.
  • Anticoccidial: Adding oregano leaves to chickens diet at a rate of 500 ppm of diet showed it provided them some protection against Eimeria spp, which cause Coccidiosis.
  • Ascites syndrome: When oregano leaves were fed to broilers in a research study, a 59% mortality rate reduction from ascites syndrome-related deaths was observed.
Summary of Poultry-associated Research involving Oregano

FormSpeciesAmountTime periodResultsRef
Essential oilBroilers250 mg/kg of diet42 daysIncreased average daily gain and body weight, and when combined with 200 mg/kg L-ascorbic acid showed a decrease in serum concentration of corticosterone, triglycerides, glucose, and MDA while raised under heat stress.S Ghazi et al., 2014
Essential oilBroilers15 mg/kg of diet42 daysWhen combined with attapulgite at 2.4 g/kg, exerted a positive effect on growth performance, ileal villus height and intestinal microbiota of birds.I Skoufos et al., 2016
Essential oilBroilers0.005 and 0.01% of diet21 daysBeneficial effects on bird performance as well as humoral and innate immune responses.A Gaiai et al., 2016
Essential oilBroilers500 ppm of diet6 daysBeneficial effects on coccidiosis prevention and displayed lower coccidiosis lesions scores.M Mohiti-Asli et al., 2015
Aqueous ExtractBroilers2 g/kg of diet57 daysImproved body weight, positively increased serum igG, number of lactobacilli in the ileum and cecum, and reduced Staphylococcus spp in intestinal tract. Showed promise for improvement of broiler performance, immune function, and contribute to a balanced gut microflora, Essential for the digestion process and protection against enteropathogenic organisms.M Pia Franciosini et al., 2016
PowderDucks0.5 to 1% of diet42 daysSignificantly increased serum enzyme activity of superoxide dismutase (SOD)J Park et al., 2015
Essential oilLaying Hens24 mg/kg of diet175 daysSignificantly improved egg production and FCR in forced molted Laying hens. Improved liver antioxidant status and mitigated the significant increase in cecal pathogenic bacteria after molt. M Bozkurt et al., 2016
Essential oilQuails400 mg/kg of diet40 daysShowed antioxidant and ameliorating effects to AFs immunosuppression.A Shalaby et al., 2016
Essential oilBroilers60 to 240 mg/kg of diet42 daysHelped to alleviate intestinal lesions, decrease E. coli populations in chickens' ileum and influenced Lactobacillus populations, linerally decreasing the number of E. coli bacterialE Du et al., 2015
Dried and ground flower tops and LeavesQuails10 to 20 g/kg of diet29 daysno adverse effectsChristaki EV et al., 2011
ExtractBroilers0.15 g/kg of diet42 daysReduced feed intake, reduced ADG, reduced FCRBasmacioglu et al., 2004
ExtractBroilers0.3 g/kg of diet42 daysSlightly less reduced feed intake, slight increase in ADG, reduced FCRBasmacioglu et al., 2004
SpiceBroilers5 g/kg of diet42 daysincreased feed intake, increased ADG, decreased (slightly) FCRFlorou-Paneri et al., 2006
ForageLaying hens 42 daysLast choice as a forage, when ranked against basil (first choice), dill (second choice), and parsley (third choice) by free ranging hens.M Kosmidou et al., 2015
Essential oilBroilers300 mg/kg of diet42 daysfeed against Eimeria tenella; anticoccidial effectsGiannenas et al., 2003
Essential oilBroilers50 to 100 mg/kg of diet42 daysantioxidant effectBotsoglou et al., 2002
Nutritional values for 1 tsp of ground, dried oregano (2g)

Vitamin A121 IU
Vitamin C0.9 mg
Vitamin E0.3 mg
Vitamin K10.9 mcg
Folate4.8 mcg
Choline0.6 mg
Calcium27.6 mg
Iron0.8 mg
Magnesium4.7 mg
Phosphorus3.5 mg
Potassium29.2 mg
Manganese0.1 mg


Scientific References