Egg quality and age of laying hens: implications for product safety

Roberts, J. R.; Chousalkar, Kapil K.; Samiullah, Samiullah

doi:10.1071/an12345

Cited by 49 publications

(42 citation statements)

References 29 publications

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“…For a*, green is towards the negative end of the scale and red towards the positive end. For b*, blue is towards the negative end and yellow towards the positive end of the scale (Roberts et al 2013). The reading was taken 3 times per location at 3 locations around the equator of each egg and an average was recorded.…”

Section: Methodsmentioning

confidence: 99%

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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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Section: Methodsmentioning

confidence: 99%

“…Totally 330 eggs were used for cuticle estimation by the method of Roberts et al (2013). Eggshells were individually soaked in a MST cuticle blue stain (MST Technologies Ltd., UK) for 1 min and rinsed in tap water 3 times to remove the excess stain.…”

Section: Methodsmentioning

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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“…Several studies have shown an increased tendency for flocks to be identified as Salmonella positive as the birds become older (Garber et al, 2003;van de Giessen et al, 2006;Wales et al, 2007;Bouzidi et al, 2012;Roberts et al, 2013) especially if birds have been moulted (Golden et al, 2008) In most cases, the initial infection resulted from residual contamination of laying houses that spread to pullets that are suffering from transport, handling and relocation/remixing stress at a time when hormonal changes associated with the onset of lay are also increasing susceptibility to infection (Line et al, 1997). This leads to a typical early peak of infection within three weeks of housing (Humbert et al, 1995;Gradel et al, 2002) but laying flocks are rarely sampled at this time (16-19 weeks of age).…”

Section: Factors Influencing Detection Of Salmonella Infected Flocksmentioning

confidence: 99%

Scientific Opinion on the public health risks of table eggs due to deterioration and development of pathogens

2014

EFSA Journal

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Salmonella Enteritidis is considered the only pathogen currently posing a major risk of egg-borne diseases in the European Union (EU). The possible impact of extending the shelf-life of eggs on the risk to consumers posed by S. Enteritidis was estimated by applying a quantitative model and comparing the actual situation regarding the storage of eggs in the EU with different possible scenarios combined, considering the prolongation of the bestbefore and the sell-by date from 7 to a maximum of 70 days. Extending the sell-by date by one week (from 21 to 28 days), but leaving the best-before date unchanged, is estimated to result in a relative risk of illness of 1.4 and 1.5 for uncooked and lightly cooked egg meals respectively, compared to the current situation. If the best-before date is also extended by one week (from 28 to 35 days), the relative risk would be 1.6 and 1.7. In the worst case scenario considered (sell-by date of 42 days, best before date of 70 days), such figures would be 2.9 and 3.5. It should be noted that the absolute risk is greater for uncooked meals compared to lightly cooked meals. An effective way to minimise any increase in risk during extended storage is to keep the eggs refrigerated both at retail and the household. Regarding egg spoilage, such events strongly depend on the hygienic conditions of egg production and practices of egg handling, including storage times and temperatures. Finally, the impact of the prolongation of storage time on the quality criteria for eggs (3-hydroxybutyric acid and lactic acid) destined for manufacturing of egg products is considered negligible. Specifically, EFSA was asked to assess: (i) the public health risk posed by relevant pathogens and in particular by Salmonella in the consumption and handling of table eggs (Term of Reference, or ToR1), (ii) the public health risk deriving from deterioration (ToR2) and (iii) possible consequences for public health of an extended shelf-life of table eggs for the specific freshness criteria for egg products as laid out in the hygiene package (ToR3). © European Food Safety Authority, 2014 KEY WORDSIn order to answer the first ToR, the BIOHAZ Panel based its conclusions on the results of a quantitative model, aimed at describing the behaviour of Salmonella Enteritidis following vertical transmission, since this serovar is recognised to be the major pathogen related to egg-borne disease because of its ability to contaminate the interior of intact eggs during their formation within the body of an infected hen. The possible impact of extending the shelf-life of eggs on other serovars of Salmonella, as well as on other pathogens, is evaluated in a qualitative manner, with no individual serovar other than S. Enteritidis currently posing a major risk of egg-borne salmonellosis in the European Union (EU), although S. Typhimurium has been associated with relatively small outbreaks due to duck eggs. Trans-shell contamination (i.e. secondary contamination) is also discussed, but the impact of a prolongation of the shelf ...

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“…In reflectometer method egg shell color measures and expresses as a percentage of black and pure white, where black refers 0% and the pure white as 100% (Roberts et al, 2013). …”

Section: External Parametersmentioning

confidence: 99%

Comparison of Production Performance and Egg Quality Characteristics of Five Strains of Korean Native Chickens

Wickramasuriya¹,

Yi²,

Yoo³

et al. 2015

Korean Journal of Poultry Science

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The production performance and egg quality traits among five strains of Korean native chickens (KNC) were evaluated in conventional cages. A total of 240 KNC were housed in a controlled environment. Each strain had 12 replicates with 4 chickens per cage. Feed intake, body weights, egg production and egg quality were measured at 24, 28 and 32 of weeks. Egg quality parameters were analyzed using 150 eggs. Results indicated significant (P<0.05) difference in average body weights, egg production and egg weight among five strains of KNC. In contrast, KNC strains effect was non-significant (P>0.05) for feed efficiency. The difference among those KNC strains on egg shell color, egg shell strength and egg shell density were not different (P>0.05) at the age of week 24 while it was significant (P<0.05) at the age of week 28 and 32. There was no effect (P>0.05) on egg length and egg shape index from five strains of KNC. The significant difference (P<0.05) was observed in egg width with KNC strains during early ages (week 24 and 28) and it was not significant (P>0.05) at the age of 32 weeks. Regarding internal quality parameters, albumen height and Haugh unit were significantly (P<0.05) affected with KNC strains while the effect on yolk color was not significant (P>0.05). Based on the egg weight and the production performance, GS-10 KNC strain was superior when compared with the other strains.

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Egg quality and age of laying hens: implications for product safety

Cited by 49 publications

References 29 publications

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

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

Scientific Opinion on the public health risks of table eggs due to deterioration and development of pathogens

Comparison of Production Performance and Egg Quality Characteristics of Five Strains of Korean Native Chickens

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