• Corpus ID: 12383324

Attractive Eggshell Color as a Breeding Goal

  title={Attractive Eggshell Color as a Breeding Goal},
  author={David Cavero and M. Schmutz and Wiebke Icken and Rudolf Preisinger},
Shell color is not an indication of internal egg quality and says nothing about the nutritive value or the quality of the egg (Flock et al., 2007). However, many consumers who prefer brown eggs, also pay attention to intensity and uniformity of color, and pale or unevenly colored eggs may be rejected. Clearly, reduced variability of eggshell color improves the presentation of eggs at point of sale (Figure 2). 

Figures and Tables from this paper

Genetic evaluation of eggshell color based on additive and dominance models in laying hens
Considering the dominant genetic variation identified for shell color, this variation should be employed to produce blue eggs for commercial purposes using a planned mating system based on data from blue-shelled chickens.
A selection study for improving eggshell colour in two parent lines of laying hens and their hybrids
It was concluded that the performance of parents and hybrids was better than that of the base populations, with respect to the characteristics studied.
Quality of eggs from different laying hen production systems, from indigenous breeds and specialty eggs
Eggs used in this study originated from laying hens raised in cages, barns, free‐range, organic eggs, and eggs enriched with n‐3 polyunsaturated fatty acids (PUFA), and from native Portuguese breeds and indicated that yolk color was lighter in organic eggs and darker in n-3 PUFA enriched eggs.
There was a substantial variation in the colour of eggs not only within the groups, but also within the breed, and the shell colour index (SCI) is suitable for reliable colour identification only in brown and non-pigmented eggs.
The eggshell cuticle of the laying hen
The cuticle is the outermost layer, deposited on the palisade layer of the eggshell during the last 1.5-2 hr of eggshell formation in utero. It is a non-calcified, thin, water-insoluble layer
Estimating the purebred–crossbred genetic correlation for uniformity of eggshell color in laying hens
The results indicate that genetic selection can be efficient to improve uniformity of eggshell color in purebreds and crossbreds, ideally by applying combined crossbred and purebred selection.
Productive performance of Easter egger crosses of Araucana and Schijndelaar roosters with white Leghorn hens
The traits characterizing the economic efficiency of layer hens (feed conversion per egg produced and per 1 kg egg mass) in experimental groups were comparable to traits recorded in heavy egg-laying hybrids.
Qualitative Morphometeric Characterization of Indigenous Chicken of Gash-Barka Region in Eritrea
The study was conducted in three sub-zones of Gash-Barka region of Eritrea from August 2017 to January 2018, to identify and characterize the indigenous chicken based on some phenotypic traits.A


Relationship between shell color and incidence of speckles in brown egg lines.
Response to selection for shell color in brown-egg layer lines has been successful in providing darker and uniformly colored eggs; however, a side problem for marketing purposes is an increased incidence of spots or speckles.
Egg and Eggshell Quality
The ovary and the oviduct the egg contents the pattern of mineralization structural variations in the mammillary layer surface defects physiochemical changes in oviductal architecture translucency
Whitening of brown-shelled eggs: mineral composition of uterine fluid and rate of protoporphyrin deposition.
It was concluded that shell whitening was associated with changes in the kinetics of porphyrin deposition rather than withChanges in the amount of p Morphyrin deposited or modifications of uterine fluid composition.
Heritabilities and genetic and phenotypic correlations of egg quality traits in brown-egg dwarf layers.
Although heritabilities for these traits were moderate to high, genetic correlations with ESC were low, suggesting a minor relationship between shell color and physical attributes of the shell as well as internal egg quality in brown-egg dwarf layers.
Changes in brown eggshell color as the hen ages.
These findings quantified the observations that older hens lay lighter colored eggs due to an increase in egg size associated with no proportionate change in the quantity of pigment deposited over the shell surface.
Breeding for optimal eggshell color in brown-egg layers
  • 2010