Been some interesting things written in the last few posts (and as I started writing this MR W appeared).
My first contention with what you've written Marches Farmer is the line "top quality triplets and quads". . . . . I didn't know there was such a thing. Anything above twins is a pain in the arse and usually results in some form of crap lamb. As for Daggy bums, i'm inclined to side with Keepers there. I've yet to see a saggy bum amongst any of my lambs this year. . . . FEC counted all of the groups last week. . . . . only had one with a high worm burden (only been wormed once with a white drench for nemo at about 6-8 weeks) and even in that group, there was not a single mucky bum. Genetics plays the biggest part I believe. Interestingly the groups that did not need worming have all been on leys with a large proportion of plantain. . . . . but thats another topic.
Apart from that I do agree you usually need a plan b. . . .. and whatever sheep you have they do require some shepherding and need getting in. But in general if you have the right sheep, then these are routine management tasks (and usually the more enjoyable ones) rather than re-active fire fighting!
With regard to feeding hard feed. Its this simple, I could not afford to run sheep if I needed to feed them hard feed. The maths just don't stack up. So they do not get fed. . . . . if they can't cope, they go. Luckily they seem to cope well. One thing I am working on, is better grassland management, so that they are getting fed as well as possible off grass!
Same goes for shelter. . . . I have the ability to house about 20 ewes in some kind of comfort, and probably 40 if crammed in. . . . . that's it. There is just no more room at the inn. As it is. . . . the only sheep that come inside, are bottle lambs, and the sick and dying.
There are people running shedding sheep in some very harsh and bleak places in Scotland and North Wales. . . . . in my honest opinion, they will cope as well as any other breed if bred for that environment. I.E I know a few folk who have replaced their hefted hill flocks of Welsh Mountain ewes with easy care ewes and seem to be doing just fine.
So having thought about it. . . . . . maybe there is no plan b! So if that's going to be the case, you've just got to work like hell to ensure that plan a is a bloody good one.
Luckily I know a man who breeds sheep that do what it says on the tin.