Simple past tense and past participle of lactate.(verb)
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Use "lactated" in a sentence
"If he lactated and could breastfeed, things would be very different."
"The filly was lightly sedated to permit the administration of her immediate lifesaving cocktails: diazepam for the seizures, mannitol and dimethyl-sulfoxide for brain swelling, vitamin C as an antioxidant, Naxcel antibiotic for secondary infection, and lactated ringer's/dextrose solution for hydration."
"In fact, I think I may have inadvertantly lactated."