There are many factors affecting the skin pigmentation of broilers. The performance of skin coloration of different breeds of broilers is different, but the yellow substances deposited on the subcutaneous fat of broilers are lutein; Only lutein and zeaxanthin have the coloring effect in lutein. They are usually found in corn, corn gluten meal, alfalfa and marigold. The feed ingredients such as corn and corn gluten are rich in lutein, but the content of lutein varies. When raw material storage time prolonged, the raw materials of corn and protein powder in summertime were all aged. The shortest storage period was about 10 months, and the loss of lutein content was nearly half. In addition, the final deposition of lutein in broiler subcutaneous fat is yellow, so the amount of subcutaneous fat directly affects the coloration of broiler skin. During the high temperature season, the feed intake of broilers decreased significantly, the corresponding intake of lutein was insufficient, and the high temperature also easily caused the oxidation of lutein and oil, resulting in a decrease in the amount of lutein available in the feed and eventually rendering the broiler coloring. Worse.
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