▁ball . ▁It ▁is ▁exp elled ▁from ▁the ▁animal ▁before ▁cal ving , ▁whereas ▁a ▁u ter ine ▁pro lapse ▁takes ▁place ▁after ▁cal ving . ▁It ▁occurs ▁when ▁there ▁is ▁an ▁increase ▁in ▁pressure ▁in ▁the ▁ab dom inal ▁cav ity ▁during ▁the ▁late ▁stages ▁of ▁part ur ition . ▁It ▁is ▁more ▁common ▁than ▁a ▁u ter ine ▁pro lapse ▁and ▁can ▁also ▁be ▁passed ▁by ▁gen et ics . ▁It ▁is ▁quite ▁common ▁for ▁a ▁v ag inal ▁pro lapse ▁to ▁occur ▁in ▁the ▁same ▁animal ▁each ▁time ▁they ▁cal ve ▁but ▁a ▁u ter ine ▁pro lapsed ▁is ▁not ▁re occ urr ing . ▁ ▁Other ▁species ▁▁ ▁Pro lapsed ▁u ter us ▁can ▁occur ▁in ▁any ▁species ▁but ▁cases ▁are ▁most ▁common ▁in ▁da iry ▁and ▁be ef ▁c ows ▁and ▁e w es . ▁Although ▁it ▁can ▁occur ▁in ▁any ▁species , ▁it ▁is ▁less ▁common ▁in ▁s ows ▁and ▁is ▁rare ▁in ▁mar es , ▁fel ines ▁and ▁b itch es ▁and ▁rabb its . ▁ ▁References ▁ ▁Pro lapsed ▁u ter us <0x0A> </s> ▁No . ▁ 2 6 2 2 ▁( High land ) ▁Squadron ▁RA ux AF ▁Regiment , ▁is ▁a ▁Royal ▁A ux ili ary ▁Air ▁Force ▁R AF ▁Regiment ▁reserve ▁squad ron ▁based ▁at ▁R AF ▁Los si em outh . ▁It ▁is ▁the ▁northern most ▁RA ux AF ▁Unit ▁in ▁the ▁United ▁Kingdom ▁and ▁was ▁formed ▁in ▁ 1 9 7 9 ▁to ▁assist ▁with ▁the ▁ground ▁defence ▁of ▁that