Application in laying hens
Lutein has good coloring effect and anti-oxidation. It protects visual activity, anti-cancer and other biological activities.Therefore, it is used as a natural feed additive for the coloration of egg yolk and the production of high-lutein content of health-care eggs, and the added value of the product is widely used in some countries.For example, in Finland there is a lutein-rich egg called GoldP lus.Each contains 5.06m g/100g lutein;In Scotland, the egg named Drinker egg contains lutein 1.91m g;In the United States, the average lutein content per ordinary egg is 0.292 mg.
Leeson and C aston (2004) Adding lutein to the corn-soybean diet to feed the laying hen for 7 days,The egg yolk color increased from 6-7 points to 12-13 points.
The level of lutein increased from 0.3-0.5 mg to 1.5-2 mg.Huang Xiaochun et al. (2007) have shown thatThe content of lutein in egg yolk increased with the increase of lutein in the diet.However, the addition of high levels of lutein to the diet had no significant effect on the performance of laying hens.Niu Zhuye et al (2008) added 1.5% lutein to the wheat-type diet to significantly improve the egg yolk color of the egg.Compared with the control group, it increased by 188.33%.However, it has little effect on egg weight, egg specific gravity and egg shape index.
Application in broilers
Poultry cannot synthesize lutein by itself, and lutein in feed is the main source of skin color.It takes 10-15 days for broilers to start eating lutein until the skin appears yellow.Therefore, lutein additives are generally carried out in the middle and late stages of broiler culture.The yellow corn soybean meal type diet contains natural lutein 10-12 m g/kg,The color of the chicken feet can reach 4-5 degrees with the Roche colorimetric fan (RYCF value).If the corn protein powder or leaf powder is added to the diet, the lutein content can reach 20m g/kg.The chromaticity can reach more than 6 degrees.
Feng Juan et al. (2005) showed that,When the level of lutein in the diet is 58.36 mg/kg, the ankle, carcass and abdominal fat color of the chicken can be significantly improved.The marigold extract can significantly increase the coloration of broiler ankles, and the chromaticity value increases significantly with time, but the chrominance growth rate decreases significantly with time.
Reasons for affecting the coloring effect
Impact on production performance
Many people think that adding natural lutein to feed is only for coloring. However, as the research progresses, lutein is constantly being discovered for its new function.Hu Yuheng et al (2014) adding 240mg/kg lutein and 0.3% Chinese herbal medicine to feed can improve the laying performance of laying hens in high temperature environment and improve egg quality.
Lutein is a carotenoid, a natural pigment widely found in vegetables, fruits, flowers and other organisms, especially in marigold,It is orange-red or orange-yellow, and its main components are lutein and zeaxanthin.With the development of the aquaculture industry and the improvement of living standards,The choice of animal products and aquatic products has changed from quantitative to qualitative.
Therefore, nutrition research not only needs to improve animal performance, but also more and more research focuses on improving product quality.People have certain preferences for the surface, meat and egg color of some aquatic products and livestock products.However, livestock, poultry and aquatic animals cannot synthesize pigments themselves and must be absorbed and deposited from feed and food.China's latest "feed additive variety‘'
The natural lutein extracted from marigold has been allowed to be used in poultry, aquatic products and ornamental fish feeds, which provides a strong guarantee for the application of natural lutein.
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