they have hatched
-ont éclos
Present perfect they conjugation of hatch.
See all conjugations of hatch

hatch

These antibodies help the chicks to fight necrotic enteritis caused by C. perfringens type A if they are exposed to the bacterium after they have hatched.
Ces anticorps aident les poussins à lutter contre l’ entérite nécrotique due à C. perfringens type A ; lorsqu’ ils sont exposés à la bactérie après leur éclosion.
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