First, the factors of the chicken itself The chickens in different growth stages have different utilization rates of feed, such as low chicks and high chickens. Differences between individual chickens also have differences in feed utilization. Second, feed factors Different types of feed, the digestibility of nutrients is not the same. Soybeans contain anti-nutritional substances such as trypsin, saponin and hemagglutinin. These substances will affect their digestion and utilization and some physiological and biochemical processes of chickens. If heated properly, anti-nutrients can be destroyed. Rapeseed cakes contain glucosinolates, which are hydrolyzed by sinazymes to produce toxic substances such as thiocyanate or oxazolidinethione. These two compounds can affect energy metabolism and feed conversion rate, and some other feed ingredients (such as Solid, green feed, grass powder, feather meal, blood meal, etc. also contain some unfavorable factors that affect feed utilization. 1. When scientifically formulating feeds for feed formulas, only various nutrients (such as energy, protein, amino acids, vitamins, minerals, etc.) can meet the nutritional needs of chickens, and the optimal ratio level can be achieved before they can make feeds. The utilization rate is highest; otherwise, it will inevitably result in the waste of feed nutrients. 2, feed processing and storage of the same feed due to different processing methods, its nutritional value is not the same. If the pressed cake has a lower protein content than the extracted quail protein, high temperatures may also denature the protein and reduce the nutritional value. The longer the feed is stored, the lower the nutritional value of the feed will be, and when it is severe, it will become mildewed and even cause animal diseases. 3. Feeding environment and the environment in which stressed chickens are placed, such as changes in temperature, humidity, ventilation, light, and harmful gas content in the air, may cause chicken stress, thereby reducing feed utilization.
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