Influence of heat stress and age on the percentage of calcium carbonate in eggshell and the percentage of broken and cracked eggs

Nikolova, N.; Pavlovski, Z.; Milošević, N.; Wähner, M.

doi:10.5194/aab-51-389-2008

Cited by 6 publications

(6 citation statements)

References 15 publications

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“…Similarly, specific gravity was lower at the higher temperature, which is in agreement with Mashaly et al (2004) and Franco-Jimenez et al (2007), who described lower values of specific gravity in birds under heat stress and explain this situation due to lower plasma calcium as a result of reduced feed consumption and lack of minerals for eggshell formation. This assumption corresponds with findings of Nikolova et al (2008), who stated that in eggs produced under heat stress, calcium carbonate percentage was lower. On the other hand, Cusack et al (2003) gave the reason for thinner eggs at higher temperatures as the more rapid precipitation of calcium carbonate.…”

Section: Discussionsupporting

confidence: 92%

Interaction of hen production type, age, and temperature on laying pattern and egg quality

Tůmová

Gous

2012

Poultry Science

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The effect of production type (layer vs. broiler breeder), age (onset and end of laying cycle), and temperature (20 and 28°C) on various aspects of the egg production process and quality was evaluated. Highly significant differences were detected between laying hens and broiler breeders (P ≤ 0.001) in all production parameters. Similarly, age significantly affected rate of lay (P ≤ 0.001; 75.4% for young vs. 62.6% for old), mean sequence length (P ≤ 0.001; 7.7 d for young vs. 2.6 d for old), and time of oviposition (P ≤ 0.001). However, there was no effect of temperature on rate of lay, sequence length, or feed intake. Significant interactions between hen type and age were apparent in rate of lay (P ≤ 0.001), sequence length (P ≤ 0.001), and time of oviposition (P ≤ 0.001). A significant interaction between production type and age (P ≤ 0.015) was evident in egg weight, but egg component proportions were dependent only on hen type. Egg shape index was significantly affected by age (P ≤ 0.004), by temperature (P ≤ 0.028), and an interaction between type and age (P ≤ 0.001). Specific gravity declined with age (P ≤ 0.035) and increasing temperature (P ≤ 0.013).

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Section: Discussionsupporting

confidence: 92%

Interaction of hen production type, age, and temperature on laying pattern and egg quality

Tůmová

Gous

2012

Poultry Science

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“…Incidence of egg cracks and mortality was significantly higher in summer season. The same results had been shown in experiment by Nikolova et al (2008) Season has no significant effect (P > 0.05) on eggshell thickness was concluded by Haque et al (2006). This result is dissimilar to the findings of Izat et al (1985) and Wilheim (1940).…”

Section: Resultssupporting

confidence: 85%

Seasonal Variation of Egg Size and Eggshell Quality Characteristics in Layers

Nikolova¹,

Kocevski²,

Bunevski³

et al. 2017

mjas

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An analysis of eggs' quality parameters (egg weight, eggshell strength, eggshell thickness and egg index) was performed in two Lohman Brown flocks of commercial laying hens at advanced age. Two farms equipped with battery cages were the places where the experiment was performed. The first farm (F1) was small, family-owned farm equipped with moderately efficient ventilation, and in the second farm (F2) a highly efficient tunnel ventilation with water pads cooling equipment was installed. Egg weight and eggshell strength were analyzed in the laboratory for testing egg quality, using Egg Multi Tester EMT 5200 and Eggshell Gauge (Robotmation Co. Ltd., Tokyo, Japan), computerized equipment that gives unbiased values, while shell thickness and egg index were measured using a micrometer. No significant differences in the average values of egg size (63.09; 63.33 g), shell thickness (0.38; 0.38 mm) and egg index (75.49; 76.56) were registered between F1 and F2 farms, respectively. Average shell strength values revealed that layers kept on F2 farm produce eggs with stronger eggshell (3,434.16 g/cm 2 ) compared to the farm F1 (3,344.82 g/cm 2 ), mainly due to the fact that the drop of the eggshell quality in the first farm in the hot summer period (July) was drastic (2,914.00 g/cm 2 ). The other explanation of this situation could be the significant drop of egg size in the farm equipped with cooling pads at the beginning of the hot season (May-June) which most probably helps the layers in maintaining their Ca reserves that later help their metabolism maintain its shell-forming capacities. The conclusion is that high summer temperatures influence the eggshell strength resulting in lower strength, but the cooling equipment mitigates this negative effect.

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“…Incidence of egg cracks and mortality was significantly higher in summer season. The same results had been shown in experiment by Nikolova et al (2008).…”

Section: T a B L Esupporting

confidence: 88%

“…Significant variations in egg weight were noticed by many researchers (Monira et al, 2003;Аnderson et al, 2004). Nikolova and Kocevski (2004), Nikolova et al (2008) and later Kocevski et al (2011) reported differences in egg weight and quality (strenght) of egg shell due to genotypes and also as influenced by season (high summer temperature).…”

Section: Introductionmentioning

confidence: 98%

Comparison of Egg Weight and Egg Shell Strength in Two Genotypes of Laying Hens

Nikolova¹,

Kocevski²,

Bunevski³

et al. 2014

mjas

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Comparative study of two, for the marketing most important, egg quality parameters (egg weight and egg shell strength) in two genotypes of commercial laying hens was realized. Egg production, egg weight (size) and egg shell strength in ISA Brown (14,879) and DeKalb White (15,376) layers, housed in battery cages under similar in-house environment and feed complete mixtures according the technological nutrient recommendation, were followed through the laying cycle. Egg weight and egg shell strength were analyzed in the Laboratory for testing egg quality using Egg shell Gauge (Robotmation Co. Ltd., Tokyo, Japan), computerized equipment that perform unbiased, shell breaking strength values. Both genotypes have high egg production that was close to the technological level of laying. No differences in egg number/hen housed were noticed. DeKalb White layers produce on average 1 g bigger eggs than the ISA Brown line layers (64.18 g vs 63.17 g), resulting in better feed to egg mass conversion. ISA Brown layers produce eggs with stronger egg shell (3864.52 g/cm 2 ) compared to DeKalb White genotype (3575.78 g/cm 2 ). High summer temperature influence the strength of the egg shell in both genotypes, resulting in lower strength compared to average egg shell strength values.

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Influence of heat stress and age on the percentage of calcium carbonate in eggshell and the percentage of broken and cracked eggs

Cited by 6 publications

References 15 publications

Interaction of hen production type, age, and temperature on laying pattern and egg quality

Interaction of hen production type, age, and temperature on laying pattern and egg quality

Seasonal Variation of Egg Size and Eggshell Quality Characteristics in Layers

Comparison of Egg Weight and Egg Shell Strength in Two Genotypes of Laying Hens

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