"It's time to end the shredding of chicks. France and Germany should be the European motor to advance on this issue," Guillaume said during a visit to his German counterpart, Klöckner.
Germany's presidency of the bloc in the second half of 2020 is an opportunity to push forward on the issue, Klöckner said.
In many poultry businesses, male chicks are separated from females soon after hatching and killed, as they do not produce eggs and generate less meat.
Tens of millions of males are shredded in each country per year.
Producers say that there is no practical, affordable and cruelty-free alternative.
READ ALSO: Germany allows slaughter of male chicks to continue
France and Germany now plan to bring together industry groups, companies, researchers and campaign groups to "share scientific knowledge" and "implement alternative methods".
"We welcome this scheme and the fact that non-governmental organizations are involved, but we expect clear regulatory commitments," said Agathe Gignoux of CIWF, a French NGO.
German farmers' group ZRF warned that "apparent solutions" via the law without a technical plan could depress domestic egg production in favour of imports – meaning the chicks would simply be exterminated somewhere else.
Both governments must tread lightly, with ever-tighter regulations chafing on financially squeezed farmers, while consumers demand more environmental and animal protection.
Scientists in several countries are working on technologies to determine the sex of chicks before they hatch, but none are ready yet for industrial-scale use.
One technique, developed by a German firm, involves using a laser to make a tiny hole to extract liquid from a fertilised egg, before testing it for the presence of a female hormone.
Austrian and French firms are working on less-invasive techniques, while scientists in other countries are looking into genetically modified chickens.
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