The soviets tried letting rats breed in zero g but they didn’t seem to manage to copulate. A number of smaller organisms have been able to breed in zero g and/or microgravity including c elegans, fruit flies, and cockroaches. They have shown that mouse IVF is at least theoretically possible (petri dish embryos are possible) but it doesn’t seem that they’ve tried actual breeding since that soviet rat experiment.
The soviets tried letting rats breed in zero g but they didn’t seem to manage to copulate. A number of smaller organisms have been able to breed in zero g and/or microgravity including c elegans, fruit flies, and cockroaches. They have shown that mouse IVF is at least theoretically possible (petri dish embryos are possible) but it doesn’t seem that they’ve tried actual breeding since that soviet rat experiment.