Limiting rearing can control the development of broiler chickens, so that the chicken's body weight meets the standards of the breed. The chickens are healthy and well-balanced, with high uniformity and timely production, which can increase the egg production rate and the fertilization rate of the breeding eggs. High feed conversion rate and good economic returns. Therefore, rearing broiler chickens adopts restricted breeding, which is the key to breed meat breeders. [Limiting feeding method] There are two methods of quantity limitation and quality limitation: 1 volume limit In production practice, the method of limiting quantity is used to limit the feeding amount, and the diet is endowed with nutritious, and at the same time, the energy and protein levels of the diet are appropriately reduced as the age of the week increases. The options for limiting the amount of feeding are: (1) Limiting the amount of daily feeds by feeding once a day; (2) Limit feeds on the next day will be limited to two days and fed in one day; (3) The limit of one-week restriction of the five-year feeding system was fed in five days; (4) Comprehensive use of the above several options. 2 quality restrictions Limit dietary nutrient levels, reduce energy, crude protein content, increase crude fiber, but feeding is not limited. The vitamins, minerals and trace elements in the diet are supplied according to the feeding standards so that the chicken can grow normally. ã€Feeding amount】 Correctly setting the amount of feeding is the key to limiting the success or failure of feeding. Too much feeding will make the chicken weight exceed the standard, the feeding amount is too small, the limit is too much, the standard weight cannot be achieved, and the growth and development of the chicken is hindered, both of which can reduce the egg production of the hen during the laying period. Roosters have low breeding ability. The amount of feed generally varies depending on the variety, strain, body weight, age, temperature, and nutritional level of the diet. Determining the amount of feed depends mainly on the size of the chicken's body weight. The purpose is to make the body weight of the flock consistent with the standard body weight. When the weight exceeds the standard, the amount of feed must not be abruptly reduced significantly. The amount of feed last week can be maintained so that the growth rate of the chicken is slower. When the chicken population is below the standard, the amount of feed must be increased. Feed the amount for the next week and encourage the chicken to increase until it meets the standard weight. The food additives has many kinds with huge quantities, It has been reached more than 2,000 varieties currently, which is widely used in the food manufacturing industry, The synthetic or natural substance can improve food quality and color, smell and taste as well as the need for preservation, preservation and processing technology. Each country has stringent control on the use of food additives, consumers are also mere mention of the food additive, the experts reminded that consumers needs not too worry about the food additives , during food processing,if not used food additives,it will take more risks, because the deterioration will cause food poisoning disease. Preservative is a kind of food additives which can appropriate prevent food spoilage, kill the toxigenic microorganisms caused by Aspergillus element, it is beneficial to human health. Food additives have a kind named as nutritional supplements, it can greatly improve the nutritional value of food, which has significantly positive on preventing malnutrition and nutritional deficiencies, and promoting nutritional balance. Phthalide is one of the food additive which we carefully focused on development, our annual production capacity is over 300 tons. products are sold to the US market nearby five years, the quality has been widely recognized. Food additives,Food Ingredient,Food Flavor Taizhou Volsen Chemical Co., Ltd. , https://www.volsenchem.com