2, feed factors. Different types of feeds have different nutrient digestibility. Soybeans contain anti-nutritional substances such as trypsin, saponin and hemagglutinin. These substances will affect their digestibility and some of the physiological and biochemical processes of chickens. If heated properly, anti-nutrients can be destroyed. Rapeseed cakes contain glucosinolates, which are hydrolyzed by glucosinolates to produce toxic substances such as thiocyanate or oxazolidinethione. These two compounds can affect energy metabolism and feed conversion, and some other feed ingredients (such as the Solid, green feed, grass powder, feather meal, blood meal, etc. also contain some unfavorable factors that affect feed utilization.
3, the scientific formula of feed. When formulating feeds, only a variety of nutrients (such as energy, protein, amino acids, vitamins, minerals, etc.) can meet the nutritional needs of chickens, and reach the best ratio to achieve the highest utilization rate of feed; It will inevitably cause the waste of feed nutrients.
4, feed processing and storage. The same feed has different nutritional values ​​because of different processing methods. If the pressed cake has a lower protein content than the extracted protein, the high temperature 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.
5, feeding environment and stress. The feeding environment of chickens, such as temperature, humidity, ventilation, light, and harmful gas content in the air, may cause chicken stress, thereby reducing feed utilization.