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Research note: Comparative estimation of genetic parameters for eggshell pigmentation traits
Runzhe Wang1, Jiahui Lai1, Honglei Jin1
1National Engineering Laboratory for Animal Breeding and MOA Key Laboratory of Animal Genetics and Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, 100193, China.
Poultry science
|February 27, 2026
まとめ
Quantities of true protoporphyrin IX (Qp) and Shell Color Index (SCI) best evaluate eggshell color variation. These indices are recommended for breeding programs to improve egg color in laying hens.
科学分野:
- Animal Science; Poultry Genetics; Colorimetry
背景:
- Eggshell color diversity is significant, especially in protoporphyrin-pigmented shells.; The CIE L*a*b* system measures color, but lightness (L*) is often prioritized over a* and b* values.; Comprehensive indices like Qp, SCI, C*, and h° exist, but their suitability for evaluating eggshell color is unclear.
研究 の 目的:
- To compare the effectiveness of comprehensive eggshell color indices (Qp, SCI, C*, h°) in reflecting color variation.; To estimate genetic parameters for these indices in Rhode Island Red and Dwarf chickens.; To determine the most suitable indices for breeding programs.
主な方法:
- Collected eggshell color data from 1,481 Rhode Island Red and 1,938 Dwarf chickens at different ages (43, 60, 80 weeks).; Calculated genetic parameters for Qp, SCI, C*, and h°.; Assessed phenotypic correlations between indices and lightness (L*).
主要な成果:
- Qp showed the highest phenotypic correlation with L*, followed by SCI, h°, and C*.; Qp decreased with age, aligning with lighter eggshells in older hens.; All indices exhibited moderate to high heritability, with h° being the highest, followed by SCI, Qp, and C*.
結論:
- Qp and SCI are recommended as phenotypic parameters for eggshell color in breeding programs.; Adopting Qp and SCI can accelerate genetic progress for brown- and pink-shelled laying hens.; Further research may explore the combined use of these indices for optimal selection.
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