Shell Color as a Measure of Egg Shell Quality

Godfrey, George F.

doi:10.3382/ps.0280150

Cited by 21 publications

(14 citation statements)

References 2 publications

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“…Similar correlations between shell colour and specific gravity have been reported by Godfrey (1949), Godfrey and Jaap (1949) and Grover et al (1980), and between shell colour and shell thickness by Godfrey (1949) and Godfrey and Jaap (1949), though Carter (1975) found a significant negative correlation between shell colour and shell thickness. The high and significant negative correlation reported by Carter (1975) between egg-shell colour and incidence of shell faults, emphasises the beneficial effect of shell colour on strength.…”

Section: Discussionsupporting

confidence: 85%

“…The high and positive significant correlation found between specific gravity and shell thickness shows the strong relationship between the two methods of assessing shell strength, in good agreement with Godfrey (1949), Godfrey and Jaap (1949), Frank et al (1964) and Marks and Kinney (1964).…”

Section: Discussionsupporting

confidence: 78%

“…There are few results concerning the relationship between shell colour and shell strength, and none is conclusive. A relatively small but significant positive correlation coefficient was reported by Godfrey (1949), Godfrey and Jaap (1949) and Grover et al (1980) between shell colour and egg specific gravity and by Godfrey (1949) and Godfrey and Jaap (1949) between shell colour and shell thickness. Potts and Wash-467 burn (1974) found no significant correlation of shell colour and four measurements of shell strength (egg specific gravity, shell thickness, non-destructive deformation and breaking strength).…”

Section: Introductionmentioning

confidence: 84%

“…Some workers have removed the membranes before measuring shell thickness, but most have left them, arguing that the membranes also contribute to shell strength (Godfrey, 1949). It is however necessary to measure thickness at several points in order to obtain an accurate assessment.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Relationship between egg‐shell colour and two measurements of shell strength in the Vasca breed

Campo

Escudero

1984

British Poultry Science

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1. Egg-shell colour, egg specific gravity, shell thickness and egg weight were determined for 2080 eggs from three varieties of the Vasca, a Spanish brown-egg-laying hen. 2. Intermediate, positive and significant (P < 0·01) correlation coefficients were found between egg-shell colour and specific gravity (0·25), or shell thickness (0·21). There was a very high (0·84), significant (P < 0·01) correlation between the measures of shell strength. 3. Shell thickness was accurately predicted with both specific gravity and egg weight as independent variables (determination coefficient 0·74); eggshell colour did not explain any further variation. 4. All traits showed considerable departure from normality in the form of negative kurtosis (shell colour and specific gravity), positive kurtosis (shell thickness and egg weight), negative skewness (shell thickness) or positive skewness (egg weight). 5. Egg-shell colour, specific gravity and shell thickness were less in July, in old birds and in eggs laid in the morning. Differences in egg quality traits between the three varieties were not significant.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 84%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Relationship between egg‐shell colour and two measurements of shell strength in the Vasca breed

Campo

Escudero

1984

British Poultry Science

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“…In studies that examine the relationship between shell colour and shell quality, Godfrey (1949) and Jopesh et al (1999) found that eggs with darker shells have a higher density. Ingram et al (2008) reported that the eggshell colour is significantly related to the shell quality, but this was not a feature that determined shell quality as definitively as egg density and shell thickness.…”

Section: Introductionmentioning

confidence: 99%

Influence of eggshell colour on egg yolk antibody level, incubation results, and growth in broiler breeders

et al. 2017

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-This study was performed to determine the effect of shell colour in eggs acquired from Ross-308 broiler breeders on the interior and exterior quality of the egg, the antibody content of the egg yolk, and growth performance. The shell colours of a total of 1350 eggs were classified, using a colorimeter, into three groups: dark (E<64), medium (E:64.00-67.00), and light (E>67). The difference between groups with respect to egg weight, shape index, shell weight, and Haugh unit value was significant. Egg yolk antibody content (IgY) was 6.658 mg/mL in the dark colour group, 5.130 mg/mL in the medium colour group, and 5.242 mg/mL in the light colour group. Among incubation characteristics, the fertility rate as, in order, 94.66%, 92.14%, and 87.92% in dark, medium, and light shell colour eggs, and the hatchability was 87.00%, 84.28%, and 80.57%, in the same order. No significant difference was observed between groups with respect to hatchability of fertile eggs and embryonic mortality rates. No significant difference was observed between groups for live weight, feed intake, and feed conversion ratio either. The eggshell colour has an effect on yolk antibody content and on the hatchability, but it has no influence on hatchability of fertile eggs, Haugh unit and growth performance.

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Avian Egg Shells: Their Structure and Characteristics

Tyler

1969

International Review of General and Experimental Zoology

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Shell Color as a Measure of Egg Shell Quality

Cited by 21 publications

References 2 publications

Relationship between egg‐shell colour and two measurements of shell strength in the Vasca breed

Relationship between egg‐shell colour and two measurements of shell strength in the Vasca breed

Influence of eggshell colour on egg yolk antibody level, incubation results, and growth in broiler breeders

Avian Egg Shells: Their Structure and Characteristics

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