Descripción: “...A single bacterium was identified in 28.6% of the cows, two bacteria in 52.4% of the cows and three or more bacteria in 19% of them. The high bacterial diversity suggested various origins; new studies into their individual role and/or synergism regarding the development of uterine disease and possible effects on superovulatory response are needed.Key words: Uterine infection, bacteria, embryo transfer (DeCs).Resumo:  Foi isolada e identificada a flora bacteriana em 21 vacas doadoras de embriões, a través de lavagem uterina, no dia 7 após a inseminação ao momento da colheita dos embriões. ...”