in the hills - this is a perennial problem with Soays. Their testes are so tiny that even at the legal 7 days they are often too small to stay through the ring. This can lead to a rig (ie one testis, or both, in the abdomen so sometimes fertile), if one pops back through, or even worse one can get stuck part way through the ring so as the testis grows it gets cut in half - must be agonising. I have had many discussions about this with the Soay sheep society and the consensus is that it can be a welfare issue to ring them before 7 days as the law requires - a law which was probably made without consulting Soay breeders
. Sometimes a larger than usual tup lamb can be ringed within the legal period, and your experienced farmer friend will be able to judge this when he goes to ring the lamb. We have sometimes had to leave it until the lambs are three weeks old - and I will happily answer for that in Court if anyone wants to prosecute me. We have never seen these older lambs experiencing more than fleeting pain.
If you explain all this to the chap doing the castrations he can make his own judgement at the time.