Egg Quality. 1. Shell Strength of Eggs from Five Commercial Strains of White Leghorn Hens During Their First Laying Cycle

Doyon, G.; Bernier‐Cardou, Michèle; Hamilton, R. M. G.; Castaigne, F.; Maclean, Hugh

doi:10.3382/ps.0641685

Cited by 9 publications

(3 citation statements)

References 25 publications

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“…It should be stated that eggshell thickness was related to the eggshell to egg ratio in most cases. The eggshell results do not correspond very closely to the conclusions drawn by Hamilton (1982) and Doyon et al (1985). The above-mentioned authors reported identically decreasing eggshell thickness towards the end of the production cycle.…”

Section: Resultscontrasting

confidence: 77%

“…Egg weight tends to increase with the age of the layer, as does the incidence of misshaped eggs, resulting in decreased eggshell thickness and decreased eggshell to egg ratio (Hamilton et al, 1979). Similar conclusions about decreasing eggshell thickness and eggshell to egg ratio were reported by Hamilton (1982), Roland (1984), and Doyon et al (1985). However, Yannakopoulos and Tserveni-Gousi (1987) reported greater eggshell thickness in older layers.…”

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confidence: 65%

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Effect of genotype, age of hens and K/k allele on eggshell quality

Ledvinka¹,

Zita²,

Hubeny³

et al. 2011

CZECH J ANIM SCI

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ABSTRACT:We assessed the influence of the particular genotype, age of layers, feather growth-rate gene, and their mutual interactions on selected indicators of eggshell quality in six groups of hens of the laying type Dominant. The following genotypes were examined in the experiment: Barred Plymouth Rock, Dominant BPR 951 (K) strain, slow-feathering; Barred Plymouth Rock, Dominant BPR 901 (k) strain, fast-feathering; Blue Plymouth Rock, Dominant BLPR 954 (K) strain, slow-feathering; Blue Plymouth Rock, Dominant BLPR 894 (k) strain, fast-feathering; crossbreds of the above strains in the F 1 generation Dominant D 107 blue (K), slow-feathering and Dominant D 107 blue (k), fast-feathering. The layers were fed a feed mixture NP1 (16.64 % CP) from the 20 th week of age and a feed mixture NP2 (15.02% CP) from the 42 nd week. Husbandry conditions met the regular requirements of laying hens. Egg production and live weight of hens were monitored for the duration of the experiment (12 months). Eggshell quality was examined at the layers' age of 27, 35 and 56 weeks. The average hen-day egg production for the duration of the experiment (12 months) was not significantly influenced by the particular genotype or the feather growth-rate gene. The varying representation of the feather growth-rate gene significantly (P ≤ 0.001) influenced the live weight; similarly, the relationship between the genotype and the representation of K/k alleles was significant. The average egg weight was influenced statistically significantly (P ≤ 0.001) by the age of hens, their genotype (P ≤ 0.05), feather growth-rate gene (P ≤ 0.001), and the relationship between the age and genotype (P ≤ 0.001). The age of hens, genotype, and the interaction of these two factors affected the egg shape index, as did the incidence of the feather growth-rate gene within the population (with a statistical significance of P ≤ 0.001). The age, genotype and the feather growth-rate gene incidence within the population also significantly affected the eggshell quality indicators. In the eggshell to egg ratio, eggshell thickness and strength, an interaction was determined between the age of hens and their particular genotype. The eggshell colour was also significantly (P ≤ 0.001) affected by hens' age, genotype (P ≤ 0.001), as well as by the feather growth-rate gene (P ≤ 0.001). No significant interaction between the age and the genotype was found for this indicator.

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Section: Resultscontrasting

confidence: 77%

mentioning

confidence: 65%

Effect of genotype, age of hens and K/k allele on eggshell quality

Ledvinka¹,

Zita²,

Hubeny³

et al. 2011

CZECH J ANIM SCI

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show abstract

“…Also, as age advanced, albumen index and Haugh unit decreased. In agreement, Doyon et al (1985) found that flock age was inversely proportional to albumen height and Haugh unit. We found the highest Haugh unit (64.74) in eggs from both systems, and this is much lower compared with what was reported in several studies (Yenice et al, 2016;Sirri et al, 2018;Zita et al, 2018;Hanusova et al, 2015).…”

Section: Discussionsupporting

confidence: 68%

Effect of Production System and Age on Egg Quality Parameters: A Case of Niğde Province Çamardı District, Turkey

Yurtseven

Şekeroğlu

Tainika

et al. 2021

Turkish JAF Sci.Tech.

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This study compared egg quality parameters in layers under free-range system with prefabricated pens and backyard while emphasizing hen age. A total of 300 eggs collected from prefabricated pens and backyard farming families in the Çamardı District of Niğde Province were used as study materials. The assessed external and internal egg quality characteristics included egg weight, shape index, shell thickness, shell breaking strength, albumen index, Haugh unit, yolk index, and yolk colour. The effect of production system on albumen index, Haugh unit, and yolk colour score was found statistically significant. There was a significant effect of age on shape index, shell thickness, shell breaking strength, albumen index, Haugh Unit, yolk index, and yolk colour score. The effect of interaction between age and production system was statistically significant for shape index, shell thickness, yolk index, Haugh Unit, and yolk colour score. It was determined that the egg`s meat and blood spots percentages from the free-range and backyard systems were 10.6% and 15.3%, respectively. It was concluded that while eggs produced from free-range system are superior in terms of egg weight, shape index, and Haugh unit those obtained from backyard hens are higher in eggshell thickness, eggshell breaking strength, and egg yolk colour.

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Shell and Interior Quality and Chemical Composition of Eggs from Hens of Different Strains and Ages Fed Different Dietary Lysine Levels

Bustany

Elwinger

1987

Acta Agriculturae Scandinavica

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Egg Quality. 1. Shell Strength of Eggs from Five Commercial Strains of White Leghorn Hens During Their First Laying Cycle

Cited by 9 publications

References 25 publications

Effect of genotype, age of hens and K/k allele on eggshell quality

Effect of genotype, age of hens and K/k allele on eggshell quality

Effect of Production System and Age on Egg Quality Parameters: A Case of Niğde Province Çamardı District, Turkey

Shell and Interior Quality and Chemical Composition of Eggs from Hens of Different Strains and Ages Fed Different Dietary Lysine Levels

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