You can't keep a herd animal on its own, so you'll need to keep a wether lamb with him when you separate him from the ewes.
Our Texel tups have been left with the ewes without any problems, but it's generally a bad plan to be feeding a tup when he's not working or recovering from work (or being prepared for work), so if you want to feed your ewes you might need to find the tup somewhere else to be.
And don't forget that rations formulated for ewes specifically may be dangerous for tups to eat. And that an 'allcomers' feed might not be nutritionally ideal for lambing ewes.
The usual advice is to buy a tup lamb in the fat ring in the summer, use him once and then eat him in late winter/spring when his hormones have died down. Repeat each year.