An interesting subthread started under 'Can you eat old sheep' which I thought warranted its own thread.
Pick up the start here:
http://www.accidentalsmallholder.net/forum/index.php?topic=17864.msg168791#msg168791I know a Lakeland farmer who runs Herdwicks on the Fells, they have a single lamb each year and I think he said he'd had one still producing and rearing her annual lamb at 17 years old. He had a one aged 13 when he was telling me this, and expected most of them to get to 9 no bother.
Fleecewife talked about commercial farming being different to smallholding / hobby farming when it comes to culling and she's right. Around these parts, hill farms cull ewes with bad udders and may cull ewes who've lost teeth or may sell them with or without lambs as 'correct below'. The majority of hill farms will sell draft (that is, sell as fit for breeding on easier farms, 'correct above and below', ie, full mouth and two good quarters) ewes as one of the main 'crops' of the farm. Depending on the farm and the system they may be sold as young as 1-crop or 2-crop, more common is to draft at 3-crop or 4-crop but some will draft 5- and 6-crop ewes who can still do a good job for a year or two, maybe longer, on easier ground.
A lot of startup farmers get their start with these old gals. They'll buy the best tup they can afford (usually an unproven tup lamb or an aged tup being sold only because he's about to be working on his own daughters) and then spend the rest of what they've got on old draft ewes from a really good farm. Put the old biddies to the new tup, the female offspring are then the foundations of the new flock. The old biddies may be able to do the same again, or may be fed and sold 'in the fat', usually for about the same as was paid for them.
On the hill farm I was on, our Swaledale girls were not tupped as lambs and were put to the Swale as shearlings so that their first lambing was as easy as possible for them. Thereafter the economics meant it was more profitable to put our own Swaley girls to the Blue-faced Leicester to produce sought-after hill-bred North Country Mule ewe lambs (the wethers being sold in the store to farmers with more grass than us to finish for Christmas or in the New Year) and buy in any additional breeding Swale ewes either as maiden shearlings or as 1- or 2-crop drafts from a harder farm than ours. Whether home-bred or bought-in, on our farm they'd be drafted at 3- or 4-crop when they were still worth a bit of money as breeders for a more 'in-bye' farm. We found if we kept them on, they probably could have a 5th crop ok with us but they'd not be fit to breed again, and our old Swales had very little value as feeding or fat sheep, so it was better all round to draft at 4-crop. On a softer farm they may be able to have 2 or even 3 more crops, and if they just had 1 or maybe 2 more crops they wouldn't lose so much condition that they'd have practically no value in the fat.
Other factors affecting how many crops a ewe could have included what tups were used. Draft Swales are worth more if they are 'Uncrossed', which means bred only to the Swale, because that's an easier lamb for a Swale to produce than a Mule or Texel cross, so it takes less out of her and she'll be able to produce more crops for her new owner.