Adding a coloring agent to the feed can improve the aesthetics and commercial value of the poultry and increase the competitive advantage of the product. Therefore, the application range of colorants is being broadened. In the compound feed for poultry, currently used colorants include a feed colorant for changing the appearance color of the feedstuff, and a Chicken body colorant deposited in the skin, legs, fleas, and fat of the chicken body and the egg yolk. Commercially available commercial coloring agents include Jialihong, Jialihuang, Jinjinhuang and Huangjingxiang. The application of colorants should also be appropriate. Excessive amounts of the colorants not only increase the cost of the feed but also reduce the deposition rate. And the darkness will affect the value of poultry products. In practical applications, the following factors may be considered. 1. The composition and components of the diet. When the proportion of barley, rice bran, rye, etc. is relatively large, the effect of the colorant is reduced. Dietary calcium and vitamins are also detrimental to pigment absorption. Adding selenium, vitamin e, and antioxidants to diets supplemented with peanut oil and vegetable oil can enhance pigment deposition. 2. The breed, sex and age of poultry. Different breeds or hybrids of birds also have different deposition of carotenoid derivatives in the yolk or in the outer skin. Under the same conditions, the coloring of the hen was better than that of the rooster; the older chickens were darker than the young chickens. As the age of older chickens increases, the ability of the gut to absorb carotenoid derivatives gradually declines, and its pigment deposition ability is becoming smaller. 3, the level of health. Poultry health directly affects the deposition of coloring agents in the body tissues, especially when digestive enzymolysis or intestinal absorption dysfunction occurs, the phenomenon of affecting the colorant deposition is more obvious. In addition, suffering from infectious diseases and parasitic infections, especially coccidiosis, salmonella, chronic respiratory diseases can lead to reduced pigmentation. 4. The amount of feed intake and pigment content directly affects the deposition of pigments. Poultry consumption is small, with less pigment absorption, and the deposition of colorants is reduced accordingly. 5, the general chicken body coloring can be completed in 2-3 weeks, while the production of a stable effect of the yolk color takes about 3 weeks. If the feeding time is too short, the coloring effect of the pigment is not sufficient; if the feeding time is too long, it is not economically worthwhile. At the same time, it should be noted that the coloring of synthetic pigments is faster, and the natural coloring agent is about 1 week slower than synthetic pigments, and the natural lutein is less effective than synthetic lutein, about 1 g of synthesis. The zeaxanthin can replace up to 2 grams of natural complex lutein. 6. Vitamin A activity, physical properties, particle size, stability, and utilization of carotenoid preparations are related to pigmentation. When vitamin A content is lower than 600 IU/kg feed, it will promote the conversion of some pigments in the body, and when the content is higher than 2500 IU/kg feed, the absorption of pigments will begin to be inhibited. Since there is competition for calcium and lutein absorption in the intestine, calcium excess inhibits the absorption of lutein. 7. Other factors such as the temperature of the feed in the process of processing, the length of time and the storage conditions will affect the coloring. Poultry feeding and management factors such as light, high temperature, high humidity, and excessive density reduce the effect of coloring.
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