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Recovery of uterine embryos in Rhesus monkeys.

A simple and efficient flushing technique for obtaining uterine embr yos from normal rhesus monkeys is described. In 22 flushings performed approximately 93% of the infused fluid was recovered. The recovered flush was clear and contained few tissue fragments in all cases. 9 embryos and 2 unfertilized ova were recovered from flushes performed between Days 17-19 of the menstrual cycle. Both zonal and hatched blastocysts were found as well as 1 22-celled morula. 2 of the embryos appeared normal. The technique could be repeated and had no apparent deleterious effects on the reproductive tract.