Avian eggshell mineralization: biochemical and functional characterization of matrix proteins

Nys, Yves; Gautron, Joël; García‐Ruiz, Juan Manuel; Hincke, Maxwell T.

doi:10.1016/j.crpv.2004.08.002

Cited by 408 publications

(378 citation statements)

References 56 publications

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“…Broiler breeders had lower Zn levels compared to laying hens (73.7 vs 94.3 µmol/l) and the Zn content decreased with oviposition time (89.7, 81.3, and 80.5 µmol/l, respectively) but this could be due to the confounding effect with the time of collection. Nys et al (2001) pointed out that Zn is a component of the carbonic anhydrase enzyme which is crucial for supplying carbonate ions during the egg shell formation. Inhibition of this enzyme results in a lowered bicarbonate ion secretion and, consequently, a greatly reduced egg shell weight.…”

Section: Discussionmentioning

confidence: 99%

Effect of hen age, environmental temperature, and oviposition time on egg shell quality and egg shell and serum mineral contents in laying and broiler breeder hens

Tůmová¹,

Gous²,

Tyler³

2014

CZECH J ANIM SCI

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ABSTRACT:The aim of the study was to evaluate egg shell quality characteristics, mineral content in the egg shell, and serum mineral concentration during the egg formation process as influenced by oviposition time and ambient temperature at the beginning and end of the laying cycle in laying hens and broiler breeders. Egg shell quality deteriorated significantly at the higher temperature and was lower in broiler breeders than in laying hens. The Ca (P = 0.047) and P (P = 0.018) contents of the egg shell were significantly higher at the higher temperature. The highest (P = 0.028) shell Ca content (352 g/kg) was in eggs laid in the morning, but the highest P (P = 0.030; 1.43 g/kg) and Mg (P = 0.001; 3.88 g/kg) contents were in eggs laid in the afternoon. Broiler breeder egg shells contained significantly more P (P = 0.004) and Mg (P = 0.001) than did those from laying hens. Serum Ca and P levels remained constant throughout the day whereas serum Mg and Zn levels decreased, the rate of decrease in Zn content being the same in all treatments, but with the amounts being greater in laying hens than broiler breeders. The results demonstrate that shell quality characteristics are more severely affected by different factors implemented in this trial compared to the shell mineral composition and especially compared to the serum mineral content.

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Section: Discussionmentioning

confidence: 99%

Effect of hen age, environmental temperature, and oviposition time on egg shell quality and egg shell and serum mineral contents in laying and broiler breeder hens

Tůmová¹,

Gous²,

Tyler³

2014

CZECH J ANIM SCI

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“…However, these features of the eggshell are reserved by its unique structure. Mineralized eggshell is formed mainly of calcium carbonate (96%); the remaining components include organic matrix (2%), magnesium, phosphorus, and a variety of trace elements (Nys et al 2004). From the inside outwards, the eggshell comprises of shell membranes and true shell that includes mammillary layer, palisade layer, vertical layer, and cuticle (Gautron et al 2014).…”

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confidence: 99%

Eggshell characteristics and cuticle deposition in three laying hen genotypes housed in enriched cages and on litter

Ketta¹,

Tůmová²

2018

CZECH J ANIM SCI

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Ketta M., Tumova E. (2018): Eggshell characteristics and cuticle deposition in three laying hen genotypes housed in enriched cages and on litter. Czech J. Anim. Sci., 63, 11-16.The objective of the present study was to compare the eggshell characteristics and cuticle deposition of Lohmann Brown, Hy-Line Silver Brown, and Isa Brown layers kept in two different housing systems. The three laying hen genotypes were housed in enriched cages (100 hens, 750 cm 2 /hen, 10 hens/cage) and in littered pens (100 hens, 9 hens/m 2 , 10 hens/pen). The experiment was carried out in weeks 40-56 of hens age. Nonsignificant interactions of genotype and housing system for eggshell quality parameters and cuticle deposition were detected in this study. Egg weight was significantly affected by genotype (P ≤ 0.001) and housing system (P ≤ 0.043). The heaviest eggs were laid by Lohmann Brown, while the lightest eggs were produced by Hy-Line Silver Brown. Eggshell strength was not affected by genotype and housing system, however, genotype had a significant effect on eggshell thickness (P ≤ 0.033). Isa Brown eggs had thicker eggshells compared to Lohmann Brown and Hy-Line Silver Brown. However, a non-significant effect of housing system on eggshell thickness was observed. Eggshell percentage was significantly affected by both genotype and housing system. Genotype of laying hens had a significant effect on cuticle deposition; significantly higher cuticle deposition was observed in Lohmann Brown eggs (P ≤ 0.001). It could be concluded that genotype had a significant effect on eggshell quality parameters and cuticle deposition. However, the housing system effect was less important in these characteristics.

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“…Of course, this phenomenon is not the only possible one, because shells are porous [8] and water can exchange between the boiling water and the protein solution. Also, it can be shown that heated proteins can dissociate: a filter paper soaked in lead acetate placed on top of a beaker where egg white is cooked turns black because of the release of hydrogen sulfide from sulfur-containing proteins.…”

Section: Meet the Challengementioning

confidence: 99%

Rubbery egg challenge

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2015

Anal Bioanal Chem

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Avian eggshell mineralization: biochemical and functional characterization of matrix proteins

Cited by 408 publications

References 56 publications

Effect of hen age, environmental temperature, and oviposition time on egg shell quality and egg shell and serum mineral contents in laying and broiler breeder hens

Effect of hen age, environmental temperature, and oviposition time on egg shell quality and egg shell and serum mineral contents in laying and broiler breeder hens

Eggshell characteristics and cuticle deposition in three laying hen genotypes housed in enriched cages and on litter

Rubbery egg challenge

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