It can be concluded that phytogenic feed additive can be used as natural non-antibiotic growth promoters, which is found from herbs, spices, essential oils and oleoresins. Phytogenic feed additives have antioxidative, antimicrobial, growth promoting and emmuno stimulant effects in poultry production. The antioxidative efficacy of some phytogenic compounds to protect the quality of feed, as well as that of food derived from animals. Phytogenic feed additives have a potential of antimicrobial effects to contribute to a final reduction of intestinal pathogen pressure through inhibition of adherence to the mucosa. It has a great role in enhancements of digestive enzyme activity and absorption capacity. Phytogenic feed additives has beneficial effects on normal gut function, the overall performances of birds ( feed intake, body weight gain, feed conversion ratio, , nutrient digestibility, carcass characteristics and egg production) , meat quality and safety in the storage, and emission reduction in poultry houses. These effects show that phytogenic additives can contribute to the improvement of production performance, and therefore production efficiency as well. The plant part of phytogenic feed additives could be included ranged from 0.01-30 g/kg feed whereas essential oils should be 500 mg/kg feed for best performance.
The identification, composition, effectiveness, toxicity and residues analysis, traceability and the risk of manipulation are the main factors to be studied in detail during the manufacturing process. Animal feed manufacturers and especially the poultry one must bring such high quality additives within cheapest cost to the market in sustainable way. Promoting the use of phytogenic feed additives in poultry production, that agrees with today consumers’ demand. There is crucial to introduce and support farmers for producing such additives from locally available herbs and spices. In general, phytogenic feed additives have positive effects, but the knowledge of their use in poultry nutrition is still limited and requires further research.