AbstractRat embryos of the CD strain were treated in a whole embryo culture system with either 30 or 40 μ1 of ethylene glycol (EG) per milliliter of culture medium for the first 8 (0–8 hr) or second 8 (8–16 hr) hr of a 48‐hr culture period. The compound was not embryolethal under these conditions but did alter growth and development. EG at 40 μ1/m1 of culture medium at 8–16 hr decreased morphological score, somite number, crown‐rump and head lengths, as well as DNA and protein contents. The most frequent abnormality induced by the compound was absence of yolk sac circulation; absent hindlimb bud, hypoplastic telencephalon, and lack of development of the otic and optic systems were also seen in EG‐exposed embryos. Since it has been reported that rodent embryos cultured in vitro lack alcohol and aldehyde dehydrogenases that metabolize EG, present results suggest that the parent compound is capable of altering normal embryonic development when administered during a brief period or
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