Genetics of Egg Shape

Marble, D. R.

doi:10.3382/ps.0220061

Cited by 16 publications

(8 citation statements)

References 4 publications

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“…A widely used shape index is the ratio of the length of the polar axis (L) to the diameter at the equator (D) or LID (e.g. Pearl and Surface, 1914;Marble, 1943;Romanoff and Romanoff, 1949). The index is often multiplied by 100 for convenience.…”

Section: Shape and Sizementioning

confidence: 99%

Measurement of Eggshell Strength*

Voisey¹,

Hunt

1974

Journal of Texture Studies

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Techniques used to measure the eggshell strength and associated parameters are reviewed. Much of the early research was based on crude instruments that did not adequately control test conditions, particularly the rate of applying force to the shell. Better instruments have been used recently to obtain precise readings. A significant advance has been the development of techniques to describe the physical properties of the shell material. This is potentially more meaningful than the empirical comparisons of egg behaviour, and is leading to a better understanding of the shell fracture mechanism. Two practical tests are currently available to the biologist for non‐destructive measurements: specific gravity of the egg and shell deformation under a non‐destructive force. Both predict ‐ with acceptable precision ‐ the shell fracture force. Eggshell strength has been investigated for over 70 years, but an ideal test method has yet to be found, and research is still required.

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Section: Shape and Sizementioning

confidence: 99%

Measurement of Eggshell Strength*

Voisey¹,

Hunt

1974

Journal of Texture Studies

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“…Secondly, the time of measurement may be important. Benjamin (1920) and Shultz (rg53¿) both observed seasonal differences although Marble (1943) could not demonstrate this trend. Furthermore, the first and second eggs in a clutch have been noted to differ in their average shape index (Marble, 1943;Shultz, 1953 e) and the heritability of the shape index of the first egg was higher than that of the second egg in Shultz's (19536) study.…”

Section: Egg Shapementioning

confidence: 68%

“…Benjamin (1920), Marble (1943) and Shultz (19536) found no correlation between shape and size. However, Hicks (1958) who calculated genetic and environmental correlations for these traits, found an average value of 0-40 for the former and -0-27 for the latter.…”

Section: Egg Shapementioning

confidence: 81%

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The genetic basis of egg quality

Baker

1960

British Poultry Science

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“…Crosses between strains laying long and round eggs are intermediate in shape (Benjamin, 1920;Marble, 1943;Axelsson, 1938). Poultrymen have long observed that shape of egg is a characteristic of individual hens.…”

Section: Characters Of the Whole Eggmentioning

confidence: 99%