Eggshell structure, mode of development and growth rate in birds

Karlsson, Ola; Lilja, Clas

doi:10.1016/j.zool.2007.11.005

Cited by 74 publications

(72 citation statements)

References 19 publications

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“…The mammillary cones are exclusively the main source for Ca mobilization during embryonic development (Karlsson and Lilja 2008;Chien et al 2009). Therefore, mammillary core formation and distribution are related to the mechanical strength and respiratory quality of the eggshell (Robinson and King 1970;Koga et al 1982).…”

Section: Eggshell Structure and Formationmentioning

confidence: 99%

Eggshell structure, measurements, and quality-affecting factors in laying hens: a review

Ketta¹,

Tůmová²

2016

Czech J. Anim. Sci.

143

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Eggshell quality is one of the most significant factors affecting poultry industry; it economically influences egg production and hatchability. Eggshell consists of shell membranes and the true shell that includes mammillary layer, palisade layer, and cuticle. Measurements of eggshell quality include eggshell weight, shell percentage, breaking strength, thickness, and density. Mainly eggshell thickness and strength are affected by the time of egg components passage through the shell gland (uterus), eggshell ultra-structure (deposition of major units), and micro-structure (crystals size and orientation). Shell quality is affected by several internal and external factors. Major factors determining the quality or structure of eggshell are oviposition time, age, genotype, and housing system. Eggshell quality can be improved through optimization of genotype, housing system, and mineral nutrition.

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Section: Eggshell Structure and Formationmentioning

confidence: 99%

Eggshell structure, measurements, and quality-affecting factors in laying hens: a review

Ketta¹,

Tůmová²

2016

Czech J. Anim. Sci.

143

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“…Since developing embryos utilize calcium from the eggshell, developmental stage can be expected to cause eggshell thinning (Vanderstoep and Richards, 1970;Bunck et al, 1985;Bennett, 1995;Castilla et al, 2007;Karlsson and Lilja, 2008). Additionally, eggshell thickness appears to be influenced by many factors including genetics, egg colour and size, the time the eggs spend in the uterus, female characteristics (condition, age, stress, health status), and the diet of the females (Kennedy and Vevers, 1973;Nys et al, 1991;Francesch et al, 1997;Ciftci et al, 2003;Boersma et al, 2004;Riczu et al, 2004;Castilla et al, 2007Castilla et al, , 2009bBirchard and Deeming, 2010).…”

Section: Introductionmentioning

confidence: 99%

The effect of developmental stage on eggshell thickness variation in endangered falcons

Castilla

Herrel²,

Robles

et al. 2010

Zoology

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“…Eggshell consists of 97% calcium carbonate, which must be broken down in the digestive system (25). The eggshell also contributes to developing high calciumconsuming organs of the chicken such as skeleton, muscles, and brain (26). Calcium absorption rates of eggshell powder were 34.8%, which was greater than those of coarse powder and calcium carbonate (27).…”

Section: Discussionmentioning

confidence: 99%

Effects of Eggshell Calcium Supplementation on Bone Mass in Postmenopausal Vietnamese Women

Sakai¹,

Hiền²,

Tuyen³

et al. 2017

Journal of Nutritional Science and Vitaminology, J Nutr Sci Vit

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Summary Bone mass decreases along with aging, especially for women after menopause because of lower estrogen secretion together with low calcium intake. This study was conducted to study the effect of eggshell calcium supplementation on bone mass in 54 postmenopausal Vietnamese women living in a farming area about 60 km from Hanoi, Vietnam. Sets of 3 subjects matched by age, bone mass, BMI and calcium intake were divided randomly into 3 groups with 18 subjects in each group. The eggshell calcium group was administered 300 mg/d calcium from eggshell, the calcium carbonate group 300 mg/d calcium from calcium carbonate and the placebo group received no calcium supplementation. Bone mass (Speed of Sound (SOS)) was measured at the beginning (the baseline), the middle (6th month) and the end of the study (12th month) by the single blind method. SOS of the eggshell group increased significantly at 12 mo (p,0.05) and was significantly higher than that of the placebo and calcium carbonate groups at 12 mo (p,0.05). The SOS of the calcium carbonate group tended to be higher than that of the placebo group but without a significant difference (p.0.05). In conclusion, eggshell calcium was more effective in increasing bone mass than calcium carbonate in postmenopausal Vietnamese women.

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Eggshell structure, mode of development and growth rate in birds

Cited by 74 publications

References 19 publications

Eggshell structure, measurements, and quality-affecting factors in laying hens: a review

Eggshell structure, measurements, and quality-affecting factors in laying hens: a review

The effect of developmental stage on eggshell thickness variation in endangered falcons

Effects of Eggshell Calcium Supplementation on Bone Mass in Postmenopausal Vietnamese Women

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