diets containing non-chemical additives are recently growing at an increasing rate using in the diet of avian nutrition. After comparing various studied on the issue, it can be surmised that it is possible to use phytogenic additive compounds as an alternative to antibiotics for promoting growth in the diets of broilers. Researchers reported that there are few evidences into how beneficial these compounds can be for improving broiler digestion and the function of their guts. This is because the effectiveness can be dependent upon a number of components. The major factors which can impact their effectiveness include the genetically makeup of the broilers, how the diet is supplemented, and how the supplements are added to the diets and to what levels . The performance of broilers has drastically improved in recent years based on improvements in feed conversion that impact their increased growth rates, with the growth period seeing a drastic reduction to a maximum of five or six weeks. The average body weights of the studied broilers indicate how they develop under normal conditions based on standard environments that promote natural development. Nowadays, nutritionists try to ban most forms of antibiotic growth promoters. Some experiments have shown that phytogenic additives as alternatives can improve broiler growth performance and decrease excreta gas emission without any negative side effect on meat quality. In addition, the nutrition of these birds has a significant impact on poultry meat quality and safety . Also, the natural additives might be used as natural herbal growth promoters for poultry. Additionally, medical plants and natural herbal dietary additives are being considered as natural sources and biologically important ingredients. High meat quality comes from more natural rearing conditions that don’t constantly use growth promoters for increasing activity and muscle mass growth and decreasing. These conditions produce less stressful animals that are more responsive to their pre-slaughter treatments .
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