الفهرس 
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Abstract
1. INTRODUCTION
Since 2006, the European Union has prohibited use of antibiotics in food preparation, in order to reduce the spread of resistant bacteria through the food chain and the growing public concern over the potential health risks and environmental effects resulting from the overuse of antibiotics as growth promoters in animal production. However, the primary producers, processors, and retailers in the animal production chain are always looking for efficient, secure, and affordable substances with comparable qualities. Therefore, the quality of the derived animals products (meat, milk, and eggs), as well as growth performance parameters have been improved by using natural feed additives from plants, such as essential oils (EOs), in animal production as alternative of synthetic feed additives (Simitzis, et al, 2011). Aromatic plants produce essential oils as secondary metabolites, which are volatile, natural, complex compounds with a characteristic odor. They are commonly produced using steam or hydro-distillation. In particular, todays, in pharmaceutical, sanitary, cosmetic, agricultural, and food sectors, essential oils have been used widely for, viruscidal, bactericidal, anti-parasitic, fungicidal, insecticidal, cosmetic and medicinal uses as well as natural extracts in folk medical. In general, their usage is environmentally friendly, beneficial, non-toxic, and in line with nature.
The ultimate beneficial nanotechnology applications in the field of animal nutrition are essential oil Nano emulsions. They are emulsions with droplet diameters ranging from 20 to 100 nm. (El-Sherbiny et al., 2016). The Nano-emulsified EOs had a greater effect in increasing fatty acids (n-3 and n-6). The bio-hydrogenation rate of polyunsaturated fatty acids into saturated fatty acids was reduced by Nano emulsified EOs. Supplements containing Nano em