Effect of housing system and age of laying hens on eggshell quality, microbial contamination, and penetration of microorganisms into eggs

Vlčková, Jana; Tůmová, E.; Ketta, Mohamed; Englmaierová, M.; Chodová, Darina

doi:10.17221/77/2017-cjas

Cited by 29 publications

(22 citation statements)

References 29 publications

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“…As a consequence of more frequent veterinary interventions, Cepero and Hernándiz [53] suggest that the risk of residues of antimicrobials, anthelmintics and various anticoccidials may be higher for eggs produced in non-cage housing systems. Several studies [57,60,104,105,110,116] also confirmed this finding and found that housing technologies significantly affect the number of bacteria on the surface of eggs and the level of microbial contaminants. In the case of conventional and enriched cage systems, eggshell contamination values in terms of both total bacterial counts and Escherichia coli are significantly lower compared to eggs from alternative technologies (aviary, barn), and the highest contamination was found in the case of barn housing.…”

Section: Gast Et Al (2019) [117]mentioning

confidence: 63%

“…Several researchers [53][54][55][56][57] state that the quality of table eggs is influenced by production factors such as the age of the hen, genetics, or feeding, and point out that the comparison of the quality of eggs from farms with different housing technologies should be treated with caution. Regarding different housing systems, there is no particular technology which is suitable for the production of eggs with superior quality [58], and the higher price of eggs from alternative housing does not necessarily mean a quality difference similar to that of prices [59].…”

Section: Egg Quality Issuesmentioning

confidence: 99%

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Sustainability and Quality Aspects of Different Table Egg Production Systems: A Literature Review

Molnár

Szöllősi

2020

Sustainability

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Eggs are of considerable importance in feeding the population, as they are a relatively inexpensive and complex food source of very high biological value. The daily animal protein requirement for the human body can be covered with eggs in the cheapest way and with the lowest environmental impact. As animal welfare, as well as environmental and health awareness issues, become increasingly prominent in developed countries, consumer demand for eggs has also changed significantly in recent years, with an increasing number of consumers buying eggs produced in non-cage housing systems. In recent years, cage housing has been more frequently debated in EU member states. An initiative was launched in 2018 to end cage housing technologies and the sale of eggs produced in this way. However, in addition to animal welfare, a number of other factors need to be considered in relation to sustainable production. For this reason, the aim of this research is to provide a comprehensive overview of the sustainability issues of various housing technologies, as well as quality factors affecting consumer health and egg consumption based on the relevant international references and databases. Although there is a growing demand for products produced in non-cage housing systems due to the increasing relevance of environmental protection, health awareness and animal welfare issues in Western societies, research has shown that non-caged production is not the best solution for environmentally, socially and economically sustainable egg production.

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Section: Gast Et Al (2019) [117]mentioning

confidence: 63%

Section: Egg Quality Issuesmentioning

confidence: 99%

Sustainability and Quality Aspects of Different Table Egg Production Systems: A Literature Review

Molnár

Szöllősi

2020

Sustainability

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“…The risk of egg contamination is related to the penetration of microorganisms from the outside environment through the natural protective egg barriers into the egg contents [13]. With the exception of endogenous contamination, the contents of freshly laid eggs usually do not show any presence of microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cladosporium cladosporioides on the Composition of Mycoflora and the Quality Parameters of Table Eggs during Storage

et al. 2021

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The eggshells of 120 experimental one-day-old table eggs were contaminated with the spore suspension of Cladosporium cladosporioides, divided into three groups (A–C) and stored at three different temperatures (3 °C, 11 °C and 20 °C) for 28 days. Visible growth of molds on/in experimental eggs was not observed within the entire storage period. No significant differences in the numbers of molds were found between particular groups of eggs. However, the composition of egg mycoflora was greatly influenced by storage conditions. Three mold genera were identified using the PCR method. The highest mold numbers were determined on Day 14 (Groups A and C) and Day 21 (Group B) when the maximum relative humidity and dew point temperature were recorded. On the same days, the dominance of Penicillium spp. and the minimum eggshell firmness were observed. Noticeable changes in egg quality were observed in eggs stored at 20 °C, and most of these eggs were downgraded at the end of storage period. The growth ability differed significantly among three mold genera. Penicillium spp. and Fusarium spp. showed better growth intensity at increased values (0.91–0.94) of water activity (aw) indicating a possible risk associated with the occurrence of mycotoxins in the egg contents.

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“…Many factors influence the functional quality of the eggshell, including the strain, age of the bird, nutrition, stress, disease and the housing system (Vlčková et al, 2018). The eggshell is considered as the natural packing material for the egg content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bromocriptine and Nano-Bromocriptine on Egg Quality Parameters of Late Laying Hens

Dawod¹,

Osman²,

Heikal³

et al. 2021

American Journal of Pharmacology and Toxicology

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The study was conducted to determine the effect of bromocriptine and nano-bromocriptine on external and internal egg qualities of late laying hens. A total of 150 Novo-gene brown strain hens of 70 weeks of age were selected from a commercial laying farm. The birds were divided randomly into three groups, with 50 birds in each. The first group was given saline and kept as control, while the second and third groups were given bromocriptine (2-bromoalpha-ergocriptine) and nano-bromocriptine, respectively. Each group was separated into two subgroups of equal number, the first receiving the treatment orally and the second receiving the treatment via subcutaneous injections at a dose of 100 microg/kg body weight/ week. During experimentation, five eggs were taken every 4 weeks from each subgroup to determine the internal and the external egg qualities. Results revealed that Administration of either bromocriptine or nano-bromocriptine increased significantly the egg weight, egg length, yolk height, yolk weight, yolk width and thick albumin height. The findings conclude that bromocriptine and nano-bromocriptine treatment could be used for the late laying hens to improve the internal and external qualities of eggs.

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Effect of housing system and age of laying hens on eggshell quality, microbial contamination, and penetration of microorganisms into eggs

Cited by 29 publications

References 29 publications

Sustainability and Quality Aspects of Different Table Egg Production Systems: A Literature Review

Sustainability and Quality Aspects of Different Table Egg Production Systems: A Literature Review

Effect of Cladosporium cladosporioides on the Composition of Mycoflora and the Quality Parameters of Table Eggs during Storage

Effect of Bromocriptine and Nano-Bromocriptine on Egg Quality Parameters of Late Laying Hens

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