Abstract
Abstract Broilers were fed different levels and types of xanthophylls to produce a wide range of skin and shank pigmentation. Color values [dominant wavelength (DWL), excitation purity (EP), and luminosity (LUM)] were obtained from the resulting shanks (live, dead, chilled) and removed shank skins using a Minolta Chroma Meter II™ and compared to values obtained on the removed shank skins with a MacBeth MC-1010™ reflectance colorimeter. Color values obtained with the two instruments on the color chips of the Hoffmann-LaRoche Yolk Colour Fan® were also compared. Intact shank values (live or dead) obtained with the Chroma Meter II™ were significantly lower and not significantly correlated to values obtained with the MC-1010™ instrument on skins from the same shanks. Removing the shanks and chilling them tended to increase correlation coefficients and decrease differences between means. A direct comparison of data collected with the two instruments on shank skins reduced mean differences and increased correlation coefficients. However, DWL values of shanks from broilers fed high pigment levels that were heterogeneous in type were not correlated. The uniformity of color within a particular sample, compounded by differences in sampling area, appeared to be the cause of the low correlation, because correlations between values obtained with the two instruments on the color chips of the color tan were high.
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