The present of antioxidants and phenolic substance in coriander oil may be the main cause of improvement in breast percent of broilers carcass. The presence of harmful bacterial populations in the gastrointestinal tract may cause breakdown of amino acids and thereby reduce their absorption as antimicrobial substances are present in coriander oil can reduce the harmful bacterial populations in the gastrointestinal tract and improve the levels of absorbed amino acids [22-23]. The carvacrol in herbal planet has stimulatory effects on pancreatic secretions [17] by increasing the secretions of digestive enzymes more amounts of nutrients like amino acids can be
digested and absorbed from the digestive tract and thereby improve carcass traits. Else increasing the percents of gizzard and liver by use of coriander oil can have positive effects via physically grinding and increasing bile secretion on nutrient digestion. With increased amounts of absorbed amino acids, organs like breast and thigh drawn more growth.