I believe vaginal prolapse can be hereditary. But not uterine .these were Brahman influenced .I've heard it can be from a mineral deficiency also , they prolapsed right before calving..
Had one a few years back..had her in the chute to pull the calf,went to wash up..and my helper hollered this cow insides just blew out…thankful I didn't turn her out with the baby before hand..have had more vaginal prolapses in the past than anything..
Ours was a old wooden seat one..that drove a splinter in my upper thigh as it was going round.country doctor had to dig it out ,with what looked like a shoeing nail..still got scar