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. 2021 Apr 19;10(4):897. doi: 10.3390/foods10040897

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(A) LS-mean egg yolk color redness a* at hen age 30 week for four hen genotypes A–D, n = 30 for genotype A and 45 for genotypes B, C and D, vertical bars indicate standard deviations. (B) Correlation of scores for visual evaluation of vegetation coverage in outdoor units of organic poultry 3 weeks prior to egg collection and yolk color redness a* of panel A data. Each data point represents one pen and 15 egg yolk colors. Score 1 = mainly bare soil, 2 = partly covered with vegetation, 3 = full covered with vegetation. (C) Representative photos of outdoor units for hen genotypes A–D at time for vegetation scoring.