Factors Influencing Egg Shell Quality—A Review

Petersen, C. F.

doi:10.1079/wps19650013

Cited by 70 publications

(22 citation statements)

References 85 publications

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“…Age of the hens significantly influenced (p < 0.05) the Haugh unit this observation agrees with earlier reports that many factors such as storage time, temperature, age of birds, strain, nutrition and disease may affect the Haugh unit (Atteh & Leeson, 2005;Toussant et al, 1999). Petersen (1965) reported that feed formulations or genetic manipulations may not reduce the economic loss attributed to moisture loss and a decline in interior egg quality during extended storage. In the same vein, Albumen height has been reported to decrease significantly post-storage and lower albumen weights of eggs modified by high storage temperature (Walsh et al, 1995).…”

Section: Discussionsupporting

confidence: 81%

Effects of Prelay Supplementations of Graded Levels of Alphamune R G on the Performance of Laying Hens

Oluseyi¹,

Bolu²,

Olonijolu³

2013

SAR

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This study was carried out to determine the effects of age at prelay (15 and 19 weeks) and dietary supplementation of graded levels of Alphamune G (0.00, 0.04, 0.05, 0.06%) on laying performance of pullet chickens. The experiment period was 17 weeks and completely randomized design was employed. Feed intake, nutrient retention, weight gain and feed to gain ratio values were similar (p > 0.05) among birds fed the different dietary inclusion levels of Alphamune G. Hen day production, Haugh unit and Albumen height were significantly high (p < 0.05) for laying hens of fed the control diet. There was also interaction effect of Alphamune G and Age. The interaction of Alphamune G and Age gave the highest value in laying hens of group B fed the 0.05% diet when compared to the control. However, birds fed the 0.06% Alphamune G inclusion level gave the best result in terms of Production characteristics, Cost to benefit ratio expressed as Cost of feed to produce a Dozen Egg and Egg Quality. Also birds of group B gave better results than that of group A except in the Haugh unit value.

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Section: Discussionsupporting

confidence: 81%

Effects of Prelay Supplementations of Graded Levels of Alphamune R G on the Performance of Laying Hens

Oluseyi¹,

Bolu²,

Olonijolu³

2013

SAR

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“…Whatever the mechanism, under certain circumstances it can break down and lead to a condition resembling, or identical with, " cage-layer-fatigue " (Bell and Siller, 1962). Furthermore, a diet marginally deficient in calcium might reduce egg production (Mehring, 1965;Petersen, 1965) without stopping it completely and the effects might be relatively long-lasting; further research on the fundamental relationship between calcium metabolism and rate of egg production is needed and is being carried out.…”

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confidence: 95%

The effect of a foreign object in the shell gland on egg production of hens on a calcium‐deficient diet

Gilbert

1969

British Poultry Science

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“…The trend to declining shell colour in older birds is to be expected (Wells, 1968) and the significant decrease in older birds of egg specific gravity and shell thickness is also well known (Peterson, 1965). Both these facts show that it is not easy to obtain eggs of good quality during late production.…”

Section: Discussionmentioning

confidence: 93%

“…Grover et al, 1980), age of the bird (Peterson, 1965;Wells, 1968) and time of oviposition (Roland et al, 1973;Washburn and Potts, 1975;Cipera, 1976).…”

Section: Introductionmentioning

confidence: 97%

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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Factors Influencing Egg Shell Quality—A Review

Cited by 70 publications

References 85 publications

Effects of Prelay Supplementations of Graded Levels of Alphamune R G on the Performance of Laying Hens

Effects of Prelay Supplementations of Graded Levels of Alphamune R G on the Performance of Laying Hens

The effect of a foreign object in the shell gland on egg production of hens on a calcium‐deficient diet

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

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