1. Ouart MD, Bell DE, Janky DM, Dukes MG, Marion JE. Influence of source and physical form of xanthophyll pigment on broiler pigmentation and performance. Poult Sci 1988; 67:544–8.
https://doi.org/10.3382/ps.0670544
2. Liu GD, Hou GY, Wang DJ, et al. Skin pigmentation evaluation in broilers fed different levels of natural okra and synthetic pigments. J Appl Poult Res 2008; 17:498–504.
https://doi.org/10.3382/japr.2008-00058
4. Castañeda MP, Hirschler EM, Sams AR. Skin pigmentation evaluation in broilers fed natural and synthetic pigments. Poult Sci 2005; 84:143–7.
https://doi.org/10.1093/ps/84.1.143
5. Pérez-Vendrell AM, Hernández JM, Llauradó L, Schierle J, Brufau J. Influence of source and ratio of xanthophyll pigments on broiler chicken pigmentation and performance. Poult Sci 2001; 80:320–6.
https://doi.org/10.1093/ps/80.3.320
6. Zhu NH, Zhang RJ, Wu H, Zhang B. Effects of lactobacillus cultures on growth performance, xanthophyll deposition, and color of the meat and skin of broilers. J Appl Poult Res 2009; 18:570–8.
https://doi.org/10.3382/japr.2009-00012
7. Karadas F, Grammenidis E, Surai PF, Acamovic T, Sparks NHC. Effects of carotenoids from lucerne, marigold and tomato on egg yolk pigmentation and carotenoid composition. Br Poult Sci 2006; 47:561–6.
https://doi.org/10.1080/00071660600962976
8. Rajput N, Naeem M, Ali S, Zhang JF, Zhang L, Wang T. The effect of dietary supplementation with the natural carotenoids curcumin and lutein on broiler pigmentation and immunity. Poult Sci 2013; 92:1177–85.
https://doi.org/10.3382/ps.2012-02853
12. Khachik F. Transformation of naturally occurring (3R, 3′R, 6′R)-lutein and its fatty acid esters to (3R)-β-cryptoxanthin and (3R, 6′R)-α-cryptoxanthin. Arch Biochem Biophys 2018; 653:107–12.
https://doi.org/10.1016/j.abb.2018.06.012
13. Lokaewmanee K, Yamauchi K, Komori T, Saito K. Enhancement of yolk color in raw and boiled egg yolk with lutein from marigold flower meal and marigold flower extract. J Poult Sci 2011; 48:25–32.
https://doi.org/10.2141/jpsa.010059
14. Chowdhury SD, Hassin BM, Das SC, Rashid MH, Ferdaus AJM. Evaluation of marigold flower and orange skin as sources of xanthophyll pigment for the improvement of egg yolk color. J Poult Sci 2008; 45:265–72.
https://doi.org/10.2141/jpsa.45.265
15. Ministry of Agriculture of the People’s Republic of China. Nutrient requirements of Chinese color-feather chicken. Feeding standard of chicken. 2nd ednBeijing, China: China Agricultural Press; 2004. (In Chinese)
19. Rajput N, Ali S, Naeem M, Khan MA, Wang T. The effect of dietary supplementation with the natural carotenoids curcumin and lutein on pigmentation, oxidative stability and quality of meat from broiler chickens affected by a coccidiosis challenge. Br Poult Sci 2014; 55:501–9.
https://doi.org/10.1080/00071668.2014.925537
20. NRC, National Research Council. 1994. Nutrient requirements of poultry. 9th revised edWashington, DC, USA: National Academy Press; 1994.
22. Ravikrishnan R, Rusia S, Ilamurugan G, et al. Safety assessment of lutein and zeaxanthin (Lutemax 2020): subchronic toxicity and mutagenicity studies. Food Chem Toxicol 2011; 49:2841–8.
https://doi.org/10.1016/j.fct.2011.08.011
26. Holownia K, Chinnan MS, Reynolds AE, Koehler PE. Evaluation of induced color changes in chicken breast meat during simulation of pink color defect. Poult Sci 2003; 82:1049–59.
https://doi.org/10.1093/ps/82.6.1049
29. Rajput N, Naeem M, Ali S, Rui Y, Tian W. Effect of dietary supplementation of marigold pigment on immunity, skin and meat color, and growth performance of broiler chickens. Braz J Poult Sci 2012; 14:291–5.
https://doi.org/10.1590/S1516-635X2012000400009