Abstract
It is well knwon that dietary xanthophyll pigment content has a direct influence on yolk colour of eggs. Some of the Japanese consumers has been complaining that most of yolks of commercial table eggs sold in the present Japanese market are too light in colour. However, little information is available indicating how dark the colour of the yolks is in commercial table eggs, or showing what is the colour of the yolks which satisfy the consumers complaining about it.Results of a survey in 1968 indicated that the colour of the yolks in eggs sold in retail stores in Gifu area in Japan was, on average, 8.99 by Roche Yolk Colour Fan (RCF)1). In winter, the colour was somewhat darker, being 9.94, than that in summer, being 8.54. Another survay in 1980 of one of the authors2) showed that members of Japanese Society of Food and Nutrition in Tokyo area was satisfied with yolk colour of 9.3 by RCF. The eggs tested in the latter survey were laid by hens fed a formula feed containing 18.0ppm of total xanthophyll in National Institute of Animal Industry.In this paper, results from a survey of the pigment content in commercial formula feed for poultry in Japan are presented.
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