Chemicals are used in livestock and poultry feed as key components to improve their growth, health and performance. These substances include vitamins (such as vitamin A, D, E, and K), minerals (such as calcium, phosphorus, and selenium), acids, and amino acids (such as lysine and methionine). These substances strengthen the immune system, muscle growth, repair body tissues, and improve digestive processes in livestock and poultry. Also, chemicals such as antibiotics and antioxidants are also used to control infections and maintain feed quality in the livestock and poultry industry. The selection and effective use of these chemicals in feed has a significant impact on the growth and health of livestock and poultry and is necessary to meet the nutritional and health needs of these animals.