It would depend on why the mustard makes them abort in my opinion.yes all alive, none escaped (after the first day or so when they learnt what a fence was) and all look healthy
we have some in lamb but which is an issue but not a big problem
I need to find a way to make sheep abort for next year - I'm told mustard in my cover crop might do that ?
You could jab but you would have to jab everything which would be costly.
I would sell the ones with good bags as in lamb ewes-less risk
The sh!t ones with nackered bags I don't really know what to do with, you could sell them in lamb but they will most likely go as culls for less than cull price, lambing them down is tricky as it won't go well and you will have to hang onto them past march to make them worth anything, unless you rear all the Lambs as orphans and ship the ewes on a couple of days after lambing.