Genetics and breeding of a black-bone and blue eggshell chicken line. 4. Responses to 3 cycles of selection for blue or green eggshell.

However, to better represent the hens' genetic potentials, and based on the highly significant correlation between each hen's means at 200d and 300d in this study (data not shown) and a previous one ( Wang et al., 2023a ), the results presented and discussed in this article are the means of these parameters over both ages, defined as L*200&300, a*200&300, b*200&300, and SCI200&300.

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