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Commercial poultry embryo sexing a step closer

A commercially viable test to determine embryo chick sexing will be available by early next year, German researchers have claimed.

The method, developed by scientists at the Dresden University of Technology and the University of Leipzig, uses spectroscopy to determine the sex of a chicken egg. It has the potential to remove the routine hatchery practice of killing day-old male chicks, which is increasingly arousing protests among consumer groups.

Increasing pressure on in-ovo chick sexing

Pressure has been particularly strong in Germany, with the German Ministry of Agriculture providing £2.4m (€3.04m) to make in-ovo chick sexing commercially viable. In April, the French Agriculture Minister Stephane Le Foll announced more than £3m (€3.9m)of funding in the same area.

Also interesting: End sought to male chick killings in France

An end to the practice of killing male layer chicks in hatcheries is being sought by a coalition of 36 members of parliament from all sides of the French government.

Dr Gerald Steiner, who is involved in the project, said the test involved using a laser beam to cut a small, circular hole at the top of the egg. Near-infrared spectroscopy is used to determine the sex of the embryo based on its DNA content, which is around 2% higher in male chicks. "To the naked eye, we cannot see the difference between male and female embryos, but the computer can – if it's programmed to do so," said Dr Steiner.

95% accuracy

The team is now able to sex each egg, with 95% accuracy, in less than a minute, he claimed. If an egg is determined to contain a female chick, the laser-cut hole is patched and return to the incubator. An automatic sexing machine is expected to be available early next year.

Gary Ford, poultry adviser in the UK farming organisation NFU, said there was huge interest in the ongoing research work around the world in determining the sex of embryos in eggs. "We have an active watching brief in this area. The Canadians have got a fairly accurate way of detecting the sex of embryos, which is 95% accurate and is working at 3,000-5,000 eggs an hour at a cost of 5p/egg.

Also interesting: German parliament rejects male chick cull ban

The German parliament has voted down the proposed ban on culling male chicks, instead opting to stick with the voluntary agreement to end the practice when it becomes commercially viable.

"Exciting and affordable technology"

"We are hoping that the technology being driven forward will become commercially available in the next 12 months. There are no extra labour costs as the eggs are graded by machine and are able also to identify infertile eggs, so this is exciting technology that is arguably affordable."

Ford stressed the male chicks were not wasted but a useful by-product, being fed to reptiles and raptors in zoos. However, Animal Aid said that, while the ending of male chick culling would be a step forward, it would not make eggs an ethical product. Campaign manager Isobel Hutchinson said: "The killing of male chicks is just one disturbing aspect of an unthinkably cruel industry."

By: Tony McDougal


  • JR Rollins

    With all due respect, the German sexing method is not competitive with my (patent pending) technique based on the following:
    1) Mine is 99.7% accrate based on testing of 25,000 eggs.
    2) Mine is performed before starting incubation (i.e., at preincubation stage).
    3) Mine is noninvasive (no holes in egg).
    4) Mine increases egg hatchability by 5% and post-hatch chick survivability by 2-5%.

  • Daniel Maennle

    That's interesting!

    Is it this Patent?
    Prof. Krautwald was researching sexing techniques on a hormonal base in 2006, when I discussed in my blog (down now) the possibility of the prior incubation sexing via biophotonic method. After they took up my idea based on the fact, that male DNA is 3 % bigger than the female DNA and a pretest at the Biophotonic Institute (closed now - but search for test eggs and report about the pretest can be found in this german poultry forum)

    they changed from the hormonal approach to the light emitting approach (but they choose to use Raman near spectroscopy).
    I suggested also to Dr. de Kloet in Feb. 2006 to develop an advancement of the Egg Buddy, which could sex single eggs or cluches. But there was no deep interest.

    Honestly I have also another idea for a non-invasive sexing method, but I am only chicken fancier and Psychologist, so I am searching Bioengineers, who want to collaborate with me. My idea and goal is to develop a device for commercial use - but also for home use for poultry and bird fanciers like chicken, pigeon, parrots, parakeets, budgerigars, falcons breeder etc. pp.
    Especially the home use device could be a huge market!

  • JR Rollins

    It is not my patented biophotonic method, but my more recent , but different methodology patent application.

  • kim huang

    Hi, that will be interesting. What stage of commercializing the product?

  • gubbi lokanath

    Useful in layer studies. How about its applicability in dual purpose and broiler varieties? Does it refer to eliminating female chicks and produce only male chicks for profitable commercial enterprise? Financial implication is to be furnished.
    Congratulations on the attempt.

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