Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Now there is a way to tell the difference between battery laid eggs and free-range or barn

11.04.2005


Scientists have developed a method of determining whether eggs labelled as ‘free-range’ or ‘barn’ have in fact been laid under battery conditions. The procedure, published in Journal of the Science of Food & Agriculture this month, means eggs can be tested without the need to visit farms.



The give-away is the dust that the eggs pick up from the surface on which they are laid.

Because the eggs are wet when freshly-laid, the dust attaches to the shell surfaces. The pattern this creates varies according to whether the eggs were laid on cage floors, barn nestboxes or outside. These distinctive patterns can easily be distinguished under ultraviolet light, as the dust fluoresces.


Professor Neville Gregory of the Royal Veterinary College, UK and colleagues in Australia used ultraviolet light to examine the surface patterns on 11520 eggs from cage, barn and free-range production systems.

360 eggs from each of 20 cage, seven barn and five free range units were examined, and categorised according to their dust patterns when exposed to UV light. The type of floor material onto which each egg was laid was known for each farm.

The authors found that the prevalence of white double parallel lines with 2-2.5cm spacing was a distinguishing feature for eggs laid on wire floors in cages.

They conclude that if five or more eggs in a sample of 90 eggs have double fluorescent lines that there is a greater than 999 in 1000 probability that the batch contains some cage-laid eggs.

“The method is effective in distinguishing between free-range eggs and those laid on a wire floor cage,” said Professor Gregory.

“It does not damage the eggs, and can be applied at any stage in the egg marketing chain.”

However, washing the eggs removed or obscured the double lines, so the authors recommend that in countries where egg washing is common, it is best to perform the test before washing.

Distinguishing features in egg shell fluorescence can be used to identify when eggs have been washed, and they can also be used in preliminary screening tests for sun exposure, which in some countries is a cause of runniness of the egg white.

Virginia Fisher | alfa
Further information:
http://www.rvc.ac.uk

More articles from Agricultural and Forestry Science:

nachricht Kakao in Monokultur verträgt Trockenheit besser als Kakao in Mischsystemen
18.09.2017 | Georg-August-Universität Göttingen

nachricht Ultrasound sensors make forage harvesters more reliable
28.08.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

Im Focus: Fast, convenient & standardized: New lab innovation for automated tissue engineering & drug

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.

MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...

Im Focus: Silencing bacteria

HZI researchers pave the way for new agents that render hospital pathogens mute

Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...

Im Focus: Artificial Enzymes for Hydrogen Conversion

Scientists from the MPI for Chemical Energy Conversion report in the first issue of the new journal JOULE.

Cell Press has just released the first issue of Joule, a new journal dedicated to sustainable energy research. In this issue James Birrell, Olaf Rüdiger,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

New quantum phenomena in graphene superlattices

19.09.2017 | Physics and Astronomy

A simple additive to improve film quality

19.09.2017 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>