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Hasin, B.M., A.J.M. Ferdaus, M.A. Islam, M.J. Uddin and M.S. Islam, 2006. Marigold and orange skin as egg yolk color promoting agents. Int. J. Poult. Sci., 5: 979-987.
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Jafari, M., R. Pirmohammadi and V. Bampidis, 2006. The use of dried tomato pulp in diets of laying hens. Int. J. Poult. Sci., 5: 618-622.
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Nobakht, A. and A.R. Safamehr, 2007. The effects of inclusion different levels of dried tomato pomace in laying hens diets on performance and plasma and egg yolk cholesterol contents. J. Anim. Vet. Adv., 6: 1101-1106.

Samli, H.E., N. Senkoylu, H. Akyurek and A. Agma, 2005. Effects of natural pigments on old hens yolk. J. Tekirdag Agric. Fac., 2: 281-285.

Santos-Bocanegra, E., X. Ospina-Osorio and E.O. Oviedo-Rondon, 2004. Evaluation of xanthophylls extracted from Tagetes erectus (Marigold Flower) and Capsicum sp. (Red Pepper Paprika) as a pigment for egg-yolks compare with synthetic pigments. Int. J. Poult. Sci., 3: 685-689.
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