The Relationship of Egg Shape to Shell Strength

Richards, Jennifer H.; Swanson, Milo H.

doi:10.3382/ps.0441555

Cited by 37 publications

(25 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Very low or no correlation between shape index and shell deformation has been reported by various authors (Richards and Swanson, 1965;Masic et al, 1966;Tung et al, 1968). These results were obtained after either determining the correlation between the properties of individual eggs from a group sample or that between the average properties of the individual hens.…”

Section: Discussioncontrasting

confidence: 41%

Section: Introductionmentioning

confidence: 98%

“…The role of egg shape in shell strength, as pointed out by Richards and Swanson (1965), has received only limited consideration. Although the curvature of the shell (caused by variation in the egg shape) may influence its strength, Richards and Swanson (1965) concluded that breaking strength did not depend to any appreciable degree upon egg shape. They further reported small, but significant, correlations between egg shape index and crushing strength, indicating that only between 5 and 11 % of the total variation in shell strength could be attributed to egg shape alone.…”

Section: Introductionmentioning

confidence: 98%

See 2 more Smart Citations

Correlations between shape index and shell deformation of hens’ eggs over a laying year

Masic¹,

Zigic²,

Šrajber³

et al. 1972

British Poultry Science

View full text Add to dashboard Cite

The egg shape index and shell deformation of 2466 pullet and 2214 hen eggs have been studied each week over a period of 45 weeks. The weekly and 5-week averages were utilised for correlation analysis.A pronounced negative correlation between shape index and shell deformation variations was found for both pullet and hen eggs. The pullet egg correlation coefficient, determined on the basis of the weekly and 5-week averages, was -0.605 and -0.885, respectively; while the corresponding values for hen eggs were -0.433 and -0.510.It has been pointed out that although a correlated variation of shape index and shell deformation with time might be due to specific conditions, it is reasonable to assume that if the time-dependent changes of the relevant properties were taken into account in the investigations, an improved correlation might be expected.

show abstract

Section: Discussioncontrasting

confidence: 41%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Correlations between shape index and shell deformation of hens’ eggs over a laying year

Masic¹,

Zigic²,

Šrajber³

et al. 1972

British Poultry Science

View full text Add to dashboard Cite

show abstract

“…Although the latter are considered the most important ones in uencing the strength of the eggshell, they only account at best for 56% of the observed differences in strength (Richards and Swanson, 1965). This fact is explained by other authors (Voisey and Hunt, 1967;Carter, 1970;Bain, 1990) as a result of the in uence of other structural variables such as egg size and shell curvature.…”

Section: Introductionmentioning

confidence: 83%

Influence of the microstructure on the shell strength of eggs laid by hens of different ages

Rodríguez‐Navarro¹,

Kälin²,

Nys³

et al. 2002

British Poultry Science

179

105

View full text Add to dashboard Cite

1. The eggshell is a bioceramic material constructed of columnar calcite crystals preferentially oriented with their c-axis perpendicular to the shell surface. 2. The influence of microstructure (crystal size, shape and crystallographic orientation of crystal grains) on the mechanical properties of eggshells (shell strength) was investigated using eggs from hens of different ages. 3. There was a strong correlation between crystallographic texture and the strength of the eggshell in the case of eggs laid by young hens. The strength of eggshells increased as the preferential orientation of the crystals constituting the eggshell decreased. 4. By comparing two age populations, the effect of hen age on eggshell properties was evaluated. In general, eggshells from aged hens had a lower breaking strength (less than half that of those laid by young hens) and showed a greater variability in their structural properties such as thickness, grain morphology and crystallographic texture. 5. Texture analysis revealed that shells from eggs laid by aged hens have two preferred crystal orientations, after (001) and (104), compared with mainly one, after (001), in eggs laid by young hens. 6. These observed changes in eggshell properties could be due to changes in the organic matrix of the eggshell associated with ageing of the hens.

show abstract

“…After weighing, length and width of each egg were measured for egg shape index calculation (width/length × 100). Specific gravity was determined by the method of Richards and Swanson (1965) using the weight of the egg in air and in water and the formula: dry weight/(dry -wet weight). The weights of yolk, albumen, and shell were used for calculation of their proportions.…”

Section: Methodsmentioning

confidence: 99%

Interaction between oviposition time, age, and environmental temperature and egg quality traits in laying hens and broiler breeders

Tůmová¹,

Gous²

2012

CZECH J ANIM SCI

View full text Add to dashboard Cite

An experiment with laying hens and broiler breeders of two ages (young 22 vs. 36 weeks, old 83 vs. 64 weeks) and at temperatures of 20 and 28°C was carried out to evaluate the interactions between oviposition time (7:30; 11:30, and 15:30 h), age, and temperature on the one hand and egg quality on the other. A significant interaction (P ≤ 0.011) was determined in oviposition time. The highest number (25.8%) of eggs was laid at 7:30 h by young laying hens kept at 20°C and the lowest (3.7%) by young layers at 15:30 h kept in the same temperature. Time of oviposition was delayed by age and a higher temperature. Egg weight was significantly influenced by production type (P ≤ 0.001; 60.5 vs. 68.1 g), age (P ≤ 0.001; 59.4 vs. 69.3 g), oviposition (P ≤ 0.001; 66.5, 63.7, 62.8 g), and temperature (P ≤ 0.022; 65.1 vs. 63.6 g). The significant threeway interaction of age, oviposition, and temperature in Haugh unit score (P ≤ 0.013) and four-way interaction of production type, age, oviposition, and temperature (P ≤ 0.05) in specific gravity show that rather than by a single factor the valuable characteristics of egg quality are considerably affected by a combination of factors.

show abstract

The Relationship of Egg Shape to Shell Strength

Cited by 37 publications

References 3 publications

Correlations between shape index and shell deformation of hens’ eggs over a laying year

Correlations between shape index and shell deformation of hens’ eggs over a laying year

Influence of the microstructure on the shell strength of eggs laid by hens of different ages

Interaction between oviposition time, age, and environmental temperature and egg quality traits in laying hens and broiler breeders

Contact Info

Product

Resources

About