Abstract
The ban of antibiotics as growth promoters in animal feed in many countries and the consumer demand for natural alternatives have increased interest in essential oils (EOs) in recent years. EOs have several properties to support their use in poultry feed, which include antioxidant, antiseptic, and insect repellent. In addition, EOs have been reported to increase digestive enzyme secretion and improve immune response to diseases. Several trials have shown positive effects of EOs on nutrient utilization and poultry performance. However, it appears that the degree of response may be influenced by the level and type of EO used, and the health status of the animal. In vitro and in vivo studies showed that specific EO blends may help to reduce incidences of subclinical necrotic enteritis and coccidiosis. Dietary supplementation of EO was reported to convey antioxidant benefits during meat storage. There is scarcity in animal trials studying the effects of EOs as an insect repellent in animal feed. The regulatory constraints on the use of EOs in the United States and European Union are also briefly discussed in this chapter. Systematic investigations on the relationship of EOs with bird performance and gut health are warranted to design an optimal animal response to EOs.
Published Version
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