Hopefully if she is only having the one, she'll do it fine on one side. Against all reason and common sense I kept my favourite 7 year old Kerry Hill ewe last year even though I knew she was only milking on one side, she had twins last year and I lifted one, the lamb she kept is now my best hogg, and the other one is fine - avaerage I would say, and this years' lamb (single thank goodness) is growing like a mushroom and stunning as usual. Strangely, there is absolutely no sign of anything wrong with the other side of her udder, no lumps, stringy bits or anything, it is just dry. Mind you, she is the only ewe out of the approx 1000 we have ere I would have kept, but she's worth it!