Billions of Day-Old Chicks Are Shredded, Gassed, and Suffocated

A chick on a conveyor belt
Joe Lamberti / The Daily Times / AP

Every year, up to 7 billion day-old male chicks are tossed into shredding machines, gassed, or suffocated in plastic bags—a process known as “chick culling.” This grim ritual is underpinned by both biology and economics: Male chicks don’t lay eggs, and they fatten up too slowly to be sold as meat. Across the globe, culling has become the default strategy for the egg industry to eliminate unwanted hatchlings.

“It is horrible. You see these puffy, newly hatched chicks on a conveyor belt,” headed toward a large blade that slices them “into a gazillion pieces,” says Leah Garcés, president of Mercy for Animals, an animal-rights advocacy group in the United States. In recent years, local and international animal-rights groups, particularly in France, Germany, and the U.S., have been ramping up pressure on governments and the egg industry to commit to ending the practice—particularly given technological innovations that allow producers to identify the sex of a developing chick before it hatches. The process is called “in-ovo-sexing,” and such technologies, versions of which are already deployed in some countries, can obviate the need for live chick culling.

Nearly five years ago, United Egg Producers, an agricultural cooperative whose members are responsible for producing more than 90 percent of all commercial eggs in the U.S., released a statement pledging to eliminate chick culling by 2020, or as soon as a “commercially available and economically feasible” technology became accessible. That pledge was negotiated with the Humane League, an animal-rights nonprofit organization. But 2020 has come and gone, and although UEP’s pledge wasn’t legally binding, some egg-industry leaders and scientists say there is little sign that the industry is anywhere near phasing in cull-free technologies that could still meet the colossal supply of more than 100 billion eggs produced every year in the U.S.

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Part of the reason for the sluggish pace of change, critics say, is that the U.S. has been investing in and nurturing the development of sophisticated cull-free technologies that, while promising, remain expensive and could take several more years to develop, scale, and deploy across the nation—particularly given that the COVID-19 pandemic has closed labs and otherwise slowed the pace of innovation. Meanwhile, a method of in-ovo-sexing is already being used in Europe—though some in the U.S. say that method, which involves creating a tiny hole in the eggshell with a laser, is subpar, because it increases the risk of contamination. European developers dispute this, however, and as of this year, cull-free eggs are available in thousands of supermarkets in Germany, the Netherlands, Switzerland, and France with only modest additional costs to consumers and hatcheries.

What’s clear is that as the hunt for a solution drags on, the U.S.-based culling continues apace. “I don’t like false promises,” says Michael Sencer, the executive vice president for Hidden Villa Ranch, a California-based food company that owns egg and dairy subsidiaries. Sencer expressed support for UEP’s pledge, but he acknowledged, “They’ve supported a number of groups that said they could come up with the technology and nothing has happened.”

UEP declined to be interviewed by Undark and instead provided a press statement highlighting its continued commitment to end culling. “We remain hopeful a breakthrough is on the horizon,” Chad Gregory, the president and CEO of UEP, said in the statement.

Whether U.S.-based producers could be nudged by critics to explore existing technologies rather than pursue new ones remains unclear, but animal-rights groups and industry leaders agree that chick culling is not only cruel—it is wasteful. “I mean, name another industry where 50 percent of the finished product immediately goes to the garbage can,” says Jonathan Hoopes, the president of Ovabrite, a Texas-based start-up developing an in-ovo-sexing technique. Incubating male eggs also occupy unnecessary space, energy, and money, making a solution to culling in the interest of both animal-rights activists and egg producers.

“Forgetting the ethics of not killing all those birds, look at the money-saving,” says Sencer, who estimated that the industry could save billions of dollars with the right technology. “It’s mind-boggling.”


Since the 2016 statement, the largest funding initiative to eliminate chick culling has come from the Foundation for Food & Agriculture Research (FFAR), which launched the “Egg-Tech Prize”—a public-private research initiative that provides funding for scientists and start-ups seeking to develop in-ovo-sexing technologies—with Open Philanthropy in 2019. Deploying such a technology would not only make chick culling obsolete; it would also allow the industry to repurpose unwanted male eggs for food, animal feed, or vaccine development.

In November 2019, FFAR announced six finalists who received more than $2 million in total seed funding to develop sex-identification technologies. Phase II of the competition will award up to $4.5 million for a single working prototype.

According to Tim Kurt, FFAR’s scientific program director, the deadline for submissions has been pushed back because of COVID-19 delays and is now scheduled for spring 2022. However, the foundation could also decide not to fund any of the teams if it is not satisfied with their progress. That’s a prospect Tom Turpen, a contender for the prize, says is a real possibility, especially given that at least some of the teams—his included—have experienced setbacks since the start of the pandemic. With travel restrictions and university laboratories shut down, a lack of access to data, equipment, and supplies has made it harder for teams to make progress on particular aspects of their projects, Kurt says.

Finalists, who were awarded $396,000 to $1.1 million each, include start-ups and research laboratories with big, out-of-the-box ideas. This includes Orbem, a German start-up that sexes chicks by combining the high-speed scanning of eggs with AI technology, and SensIT Ventures, Inc., a California-based company, which Turpen heads, that uses a microchip to sex chicks by identifying gases emitted by eggs early in development. The selection team specifically funded projects that could potentially upend the egg industry, Kurt says.

The technologies that were selected have “the potential to really transform the industry,” says Kurt, who was involved in the selection. “They might be a bit higher-risk, but if they were successful, and our funding could help them become successful, they would really be the most ideal solution.”

Kurt and other industry leaders are optimistic that some of these technologies will help eliminate chick culling in the near future, but others are less hopeful. Changing current practices, Sencer says, would require “billions of dollars of investment in new equipment. And it’s just not going to happen [quickly]; it’s happening slowly.” Sencer added that he predicts the technology may be scalable toward the end of the decade.

Even researchers competing in the Egg-Tech Prize admit that, although a sexing technology may be on the horizon, cull-free eggs won’t be scalable for at least two more years. Turpen says the biggest obstacle lies in developing a technology that is not only capable of rapidly and accurately sexing chicks, but is also readily affordable to consumers and hatcheries across the nation“You could do a lot of things to identify the sex of the egg. That’s not the point. The point is: Can you do it and still have eggs people can afford to eat?”

To avoid a surge in costs that would inevitably arise from suddenly adopting a new mode of production, Turpen says a more likely and more reasonable path to scaling this nationally would be a slow and incremental process. “The adoption and replacement of existing equipment—that’s going to look more like making the coal industry go away.”

Other researchers in the Egg-Tech Prize have also made clear that an all-encompassing solution to culling is not around the corner. Benjamin Schusser, whose research with colleagues at the Technical University of Munich turned into the spin-off company Orbem, declined an interview, saying “we don’t want to awake[n] hope that there is a solution almost ready for market.” Pedro Gómez, the CEO and a co-founder of Orbem said in a 2019 interview with Germany’s Federal Ministry for Economic Affairs and Energy that the company hopes to “classify 1 billion eggs per year by 2025.”

Given the mismatch in expectations, some are baffled by UEP’s ambitious commitments to stamping out culling. Hoopes says the industry has made similar pledges in the past and failed to yield tangible results.

But David Coman-Hidy, the president of the Humane League, considers the progress in research and development since 2016 a “major win,” and credits the UEP pledge with heightening awareness about a cruel and largely unheard-of practice while bolstering innovation in in-ovo-sexing technologies. In fact, the Humane League saw the 2020 goal as somewhat flexible, Coman-Hidy says. “Back then, it was such early days, we didn’t know how quickly or how many companies would get involved or what the research would look like.”


Meanwhile, commercially viable, in-ovo-sexing technologies already exist in Germany and France. And Germany is poised to become the first country to ban the industrial culling of male chicks, after the government approved a draft law to end the practice from 2022 onward.

Currently, a company based in Germany and the Netherlands called respeggt GmbH employs in-ovo-sexing by creating a tiny hole in the egg using a laser, extracting fluids, and sexing the chick by testing for specific hormones, Kristin Hoeller, respeggt’s head of business development and public affairs, explains. The technique, known as Seleggt, is based on research by scientists at Leipzig University that was further developed in collaboration with Rewe, a German supermarket chain, and HatchTech, a Dutch technology company specializing in incubation and hatchery equipment.

The method can sort chicks on the ninth day of development, when chick embryos are “exceptionally unlikely” to experience any sensation whatsoever, David Mellor, a professor emeritus of animal-welfare science and bioethics at Massey University, in New Zealand, wrote in an email. This is a crucial detail, given that chick embryos have the capacity to experience pain at later stages of development. A procedure that might cause harm, such as using a male egg for food or vaccine development, may simply be shifting the cruel practice to an earlier stage, says Peter Singer, an animal-rights advocate and bioethics professor at Princeton.

Using this method, respeggt now has cull-free eggs in more than 6,000 supermarkets across France, Germany, and the Netherlands, with hopes to expand further. They have also devised a ready-to-implement business strategy for producing commercial cull-free eggs. Hatcheries won’t have to invest anything, Hoeller says. Instead, costs will be passed on to centers where eggs are packed into cartons for commercial distribution. These packing stations will have to pay a license fee of about 2 euro cents, roughly the same in U.S. currency, per egg. Although respeggt plays no role in how supermarkets price eggs, the cost to consumers ranges from 2 to 5 euro cents more per respeggt egg than regular ones.

Many U.S. experts, however, are concerned that creating a hole in the eggs could pose a serious food-safety risk, given that it increases the chances of contamination from external sources. “It’s a risk that I think the industry would rather not take,” Turpen says. Kurt echoes this, saying that all finalists explicitly use noninvasive techniques to avoid this possibility. Focusing on noninvasive techniques also means they can be more easily repurposed for other scientific endeavors, such as vaccine development, he adds.

Hoeller disputes the suggestion that respeggt’s technology poses an infection risk. “The perforation of the eggshell with the laser has no negative results at all,” she says, adding that the hole is so small, it actually closes itself naturally within 30 minutes.

To be sure, some animal-rights groups suggest that quibbling over a technological solution distracts from what they see as the real problem at hand: the egg industry itself. “Instead of putting a Band-Aid on a Band-Aid on a Band-Aid and trying to fix all these problems with more technology and more technology, here’s another idea: Why don’t we do plant-based eggs?” Garcés says. She and other activists point to food waste, animal suffering, and health-associated costs as reasons to divest money away from the egg industry to support companies that produce plant-based alternatives.

Short of that, though, other noninvasive egg-sexing technologies have also been developed in Europe. Prior to the coronavirus pandemic, and amid pressure by the French government to ban culling by the end of 2021, Carrefour supermarkets planned to launch their first round of cull-free eggs on May 1, 2020. However, experts note that this technology sexes chicks on the 13th day of development, during a period in which the chick fetus may experience pain. Anticipating these criticisms, the German company behind this technology, Agri Advanced Technologies GmbH, a subsidiary of EW Group, is currently developing another technology aimed at determining the sex of chicks on the fifth day of development.

Although imperfect, Hoopes suggested that the existence of viable, up-and-running technologies in Europe raises questions about why the U.S. is taking a slower, more ambitious approach. But other experts speculate that the technologies being pursued in the U.S. may ultimately prove cheaper and more flexible in the long run. “You would think the simplest method of doing this would be the best,” Singer says. “But maybe for very large producers, the investment is worth it. Maybe it pays off in saving labor costs or other costs.”

At this point, it’s not clear what the best strategy to eliminate culling is yet, Singer says, but he believes there is a moral imperative to at least try to stamp out the practice from hatcheries around the globe. It’s also important to continue to pressure the industry to change, he says, but change will require not only perseverance, but patience. “These things,” he says, “will take some time.”